minetest/src/content_mapblock.cpp

/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "content_mapblock.h"
#include "util/numeric.h"
#include "util/directiontables.h"
#include "mapblock_mesh.h" // For MapBlock_LightColor() and MeshCollector
#include "settings.h"
#include "nodedef.h"
#include "client/tile.h"
#include "mesh.h"
#include <IMeshManipulator.h>
#include "client.h"
#include "log.h"
#include "noise.h"

// Distance of light extrapolation (for oversized nodes)
// After this distance, it gives up and considers light level constant
#define SMOOTH_LIGHTING_OVERSIZE 1.0

struct LightFrame
{
	f32 lightsA[8];
	f32 lightsB[8];
	u8 light_source;
};

static const v3s16 light_dirs[8] = {
	v3s16(-1, -1, -1),
	v3s16(-1, -1,  1),
	v3s16(-1,  1, -1),
	v3s16(-1,  1,  1),
	v3s16( 1, -1, -1),
	v3s16( 1, -1,  1),
	v3s16( 1,  1, -1),
	v3s16( 1,  1,  1),
};

// Create a cuboid.
//  collector     - the MeshCollector for the resulting polygons
//  box           - the position and size of the box
//  tiles         - the tiles (materials) to use (for all 6 faces)
//  tilecount     - number of entries in tiles, 1<=tilecount<=6
//  c             - colors of the cuboid's six sides
//  txc           - texture coordinates - this is a list of texture coordinates
//                  for the opposite corners of each face - therefore, there
//                  should be (2+2)*6=24 values in the list. Alternatively,
//                  pass NULL to use the entire texture for each face. The
//                  order of the faces in the list is up-down-right-left-back-
//                  front (compatible with ContentFeatures). If you specified
//                  0,0,1,1 for each face, that would be the same as
//                  passing NULL.
//  light source  - if greater than zero, the box's faces will not be shaded
void makeCuboid(MeshCollector *collector, const aabb3f &box,
	TileSpec *tiles, int tilecount, const video::SColor *c,
	const f32* txc, const u8 light_source)
{
	assert(tilecount >= 1 && tilecount <= 6); // pre-condition

	v3f min = box.MinEdge;
	v3f max = box.MaxEdge;

	if(txc == NULL) {
		static const f32 txc_default[24] = {
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1
		};
		txc = txc_default;
	}

	video::SColor c1 = c[0];
	video::SColor c2 = c[1];
	video::SColor c3 = c[2];
	video::SColor c4 = c[3];
	video::SColor c5 = c[4];
	video::SColor c6 = c[5];
	if (!light_source) {
		applyFacesShading(c1, v3f(0, 1, 0));
		applyFacesShading(c2, v3f(0, -1, 0));
		applyFacesShading(c3, v3f(1, 0, 0));
		applyFacesShading(c4, v3f(-1, 0, 0));
		applyFacesShading(c5, v3f(0, 0, 1));
		applyFacesShading(c6, v3f(0, 0, -1));
	}

	video::S3DVertex vertices[24] =
	{
		// up
		video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c1, txc[0],txc[1]),
		video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c1, txc[2],txc[1]),
		video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c1, txc[2],txc[3]),
		video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c1, txc[0],txc[3]),
		// down
		video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c2, txc[4],txc[5]),
		video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c2, txc[6],txc[5]),
		video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c2, txc[6],txc[7]),
		video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c2, txc[4],txc[7]),
		// right
		video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c3, txc[ 8],txc[9]),
		video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c3, txc[10],txc[9]),
		video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c3, txc[10],txc[11]),
		video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c3, txc[ 8],txc[11]),
		// left
		video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c4, txc[12],txc[13]),
		video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c4, txc[14],txc[13]),
		video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c4, txc[14],txc[15]),
		video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c4, txc[12],txc[15]),
		// back
		video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c5, txc[16],txc[17]),
		video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c5, txc[18],txc[17]),
		video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c5, txc[18],txc[19]),
		video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c5, txc[16],txc[19]),
		// front
		video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c6, txc[20],txc[21]),
		video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c6, txc[22],txc[21]),
		video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c6, txc[22],txc[23]),
		video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c6, txc[20],txc[23]),
	};

	for(int i = 0; i < 6; i++)
				{
				switch (tiles[MYMIN(i, tilecount-1)].rotation)
				{
				case 0:
					break;
				case 1: //R90
					for (int x = 0; x < 4; x++)
						vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
					break;
				case 2: //R180
					for (int x = 0; x < 4; x++)
						vertices[i*4+x].TCoords.rotateBy(180,irr::core::vector2df(0, 0));
					break;
				case 3: //R270
					for (int x = 0; x < 4; x++)
						vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
					break;
				case 4: //FXR90
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
						vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
					}
					break;
				case 5: //FXR270
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
						vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
					}
					break;
				case 6: //FYR90
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
						vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
					}
					break;
				case 7: //FYR270
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
						vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
					}
					break;
				case 8: //FX
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
					}
					break;
				case 9: //FY
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
					}
					break;
				default:
					break;
				}
			}
	u16 indices[] = {0,1,2,2,3,0};
	// Add to mesh collector
	for (s32 j = 0; j < 24; j += 4) {
		int tileindex = MYMIN(j / 4, tilecount - 1);
		collector->append(tiles[tileindex], vertices + j, 4, indices, 6);
	}
}

// Create a cuboid.
//  collector - the MeshCollector for the resulting polygons
//  box       - the position and size of the box
//  tiles     - the tiles (materials) to use (for all 6 faces)
//  tilecount - number of entries in tiles, 1<=tilecount<=6
//  lights    - vertex light levels. The order is the same as in light_dirs
//  txc       - texture coordinates - this is a list of texture coordinates
//              for the opposite corners of each face - therefore, there
//              should be (2+2)*6=24 values in the list. Alternatively, pass
//              NULL to use the entire texture for each face. The order of
//              the faces in the list is up-down-right-left-back-front
//              (compatible with ContentFeatures). If you specified 0,0,1,1
//              for each face, that would be the same as passing NULL.
//  light_source - node light emission
static void makeSmoothLightedCuboid(MeshCollector *collector, const aabb3f &box,
	TileSpec *tiles, int tilecount, const u16 *lights , const f32 *txc,
	const u8 light_source)
{
	assert(tilecount >= 1 && tilecount <= 6); // pre-condition

	v3f min = box.MinEdge;
	v3f max = box.MaxEdge;

	if (txc == NULL) {
		static const f32 txc_default[24] = {
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1
		};
		txc = txc_default;
	}
	static const u8 light_indices[24] = {
		3, 7, 6, 2,
		0, 4, 5, 1,
		6, 7, 5, 4,
		3, 2, 0, 1,
		7, 3, 1, 5,
		2, 6, 4, 0
	};
	video::S3DVertex vertices[24] = {
		// up
		video::S3DVertex(min.X, max.Y, max.Z, 0, 1, 0, video::SColor(), txc[0], txc[1]),
		video::S3DVertex(max.X, max.Y, max.Z, 0, 1, 0, video::SColor(), txc[2], txc[1]),
		video::S3DVertex(max.X, max.Y, min.Z, 0, 1, 0, video::SColor(), txc[2], txc[3]),
		video::S3DVertex(min.X, max.Y, min.Z, 0, 1, 0, video::SColor(), txc[0], txc[3]),
		// down
		video::S3DVertex(min.X, min.Y, min.Z, 0, -1, 0, video::SColor(), txc[4], txc[5]),
		video::S3DVertex(max.X, min.Y, min.Z, 0, -1, 0, video::SColor(), txc[6], txc[5]),
		video::S3DVertex(max.X, min.Y, max.Z, 0, -1, 0, video::SColor(), txc[6], txc[7]),
		video::S3DVertex(min.X, min.Y, max.Z, 0, -1, 0, video::SColor(), txc[4], txc[7]),
		// right
		video::S3DVertex(max.X, max.Y, min.Z, 1, 0, 0, video::SColor(), txc[ 8], txc[9]),
		video::S3DVertex(max.X, max.Y, max.Z, 1, 0, 0, video::SColor(), txc[10], txc[9]),
		video::S3DVertex(max.X, min.Y, max.Z, 1, 0, 0, video::SColor(), txc[10], txc[11]),
		video::S3DVertex(max.X, min.Y, min.Z, 1, 0, 0, video::SColor(), txc[ 8], txc[11]),
		// left
		video::S3DVertex(min.X, max.Y, max.Z, -1, 0, 0, video::SColor(), txc[12], txc[13]),
		video::S3DVertex(min.X, max.Y, min.Z, -1, 0, 0, video::SColor(), txc[14], txc[13]),
		video::S3DVertex(min.X, min.Y, min.Z, -1, 0, 0, video::SColor(), txc[14], txc[15]),
		video::S3DVertex(min.X, min.Y, max.Z, -1, 0, 0, video::SColor(), txc[12], txc[15]),
		// back
		video::S3DVertex(max.X, max.Y, max.Z, 0, 0, 1, video::SColor(), txc[16], txc[17]),
		video::S3DVertex(min.X, max.Y, max.Z, 0, 0, 1, video::SColor(), txc[18], txc[17]),
		video::S3DVertex(min.X, min.Y, max.Z, 0, 0, 1, video::SColor(), txc[18], txc[19]),
		video::S3DVertex(max.X, min.Y, max.Z, 0, 0, 1, video::SColor(), txc[16], txc[19]),
		// front
		video::S3DVertex(min.X, max.Y, min.Z, 0, 0, -1, video::SColor(), txc[20], txc[21]),
		video::S3DVertex(max.X, max.Y, min.Z, 0, 0, -1, video::SColor(), txc[22], txc[21]),
		video::S3DVertex(max.X, min.Y, min.Z, 0, 0, -1, video::SColor(), txc[22], txc[23]),
		video::S3DVertex(min.X, min.Y, min.Z, 0, 0, -1, video::SColor(), txc[20], txc[23]),
	};

	for(int i = 0; i < 6; i++) {
		switch (tiles[MYMIN(i, tilecount-1)].rotation) {
		case 0:
			break;
		case 1: //R90
			for (int x = 0; x < 4; x++)
				vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
			break;
		case 2: //R180
			for (int x = 0; x < 4; x++)
				vertices[i*4+x].TCoords.rotateBy(180,irr::core::vector2df(0, 0));
			break;
		case 3: //R270
			for (int x = 0; x < 4; x++)
				vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
			break;
		case 4: //FXR90
			for (int x = 0; x < 4; x++) {
				vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
				vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
			}
			break;
		case 5: //FXR270
			for (int x = 0; x < 4; x++) {
				vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
				vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
			}
			break;
		case 6: //FYR90
			for (int x = 0; x < 4; x++) {
				vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
				vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
			}
			break;
		case 7: //FYR270
			for (int x = 0; x < 4; x++) {
				vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
				vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
			}
			break;
		case 8: //FX
			for (int x = 0; x < 4; x++) {
				vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
			}
			break;
		case 9: //FY
			for (int x = 0; x < 4; x++) {
				vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
			}
			break;
		default:
			break;
		}
	}
	u16 indices[] = {0,1,2,2,3,0};
	for (s32 j = 0; j < 24; ++j) {
		int tileindex = MYMIN(j / 4, tilecount - 1);
		vertices[j].Color = encode_light_and_color(lights[light_indices[j]],
			tiles[tileindex].color, light_source);
		if (!light_source)
			applyFacesShading(vertices[j].Color, vertices[j].Normal);
	}
	// Add to mesh collector
	for (s32 k = 0; k < 6; ++k) {
		int tileindex = MYMIN(k, tilecount - 1);
		collector->append(tiles[tileindex], vertices + 4 * k, 4, indices, 6);
	}
}

// Create a cuboid.
//  collector     - the MeshCollector for the resulting polygons
//  box           - the position and size of the box
//  tiles         - the tiles (materials) to use (for all 6 faces)
//  tilecount     - number of entries in tiles, 1<=tilecount<=6
//  c             - color of the cuboid
//  txc           - texture coordinates - this is a list of texture coordinates
//                  for the opposite corners of each face - therefore, there
//                  should be (2+2)*6=24 values in the list. Alternatively,
//                  pass NULL to use the entire texture for each face. The
//                  order of the faces in the list is up-down-right-left-back-
//                  front (compatible with ContentFeatures). If you specified
//                  0,0,1,1 for each face, that would be the same as
//                  passing NULL.
//  light source  - if greater than zero, the box's faces will not be shaded
void makeCuboid(MeshCollector *collector, const aabb3f &box, TileSpec *tiles,
	int tilecount, const video::SColor &c, const f32* txc,
	const u8 light_source)
{
	video::SColor color[6];
	for (u8 i = 0; i < 6; i++)
		color[i] = c;
	makeCuboid(collector, box, tiles, tilecount, color, txc, light_source);
}

// Gets the base lighting values for a node
//  frame  - resulting (opaque) data
//  p      - node position (absolute)
//  data   - ...
//  light_source - node light emission level
static void getSmoothLightFrame(LightFrame *frame, const v3s16 &p, MeshMakeData *data, u8 light_source)
{
	for (int k = 0; k < 8; ++k) {
		u16 light = getSmoothLight(p, light_dirs[k], data);
		frame->lightsA[k] = light & 0xff;
		frame->lightsB[k] = light >> 8;
	}
	frame->light_source = light_source;
}

// Calculates vertex light level
//  frame        - light values from getSmoothLightFrame()
//  vertex_pos   - vertex position in the node (coordinates are clamped to [0.0, 1.0] or so)
static u16 blendLight(const LightFrame &frame, const core::vector3df& vertex_pos)
{
	f32 x = core::clamp(vertex_pos.X / BS + 0.5, 0.0 - SMOOTH_LIGHTING_OVERSIZE, 1.0 + SMOOTH_LIGHTING_OVERSIZE);
	f32 y = core::clamp(vertex_pos.Y / BS + 0.5, 0.0 - SMOOTH_LIGHTING_OVERSIZE, 1.0 + SMOOTH_LIGHTING_OVERSIZE);
	f32 z = core::clamp(vertex_pos.Z / BS + 0.5, 0.0 - SMOOTH_LIGHTING_OVERSIZE, 1.0 + SMOOTH_LIGHTING_OVERSIZE);
	f32 lightA = 0.0;
	f32 lightB = 0.0;
	for (int k = 0; k < 8; ++k) {
		f32 dx = (k & 4) ? x : 1 - x;
		f32 dy = (k & 2) ? y : 1 - y;
		f32 dz = (k & 1) ? z : 1 - z;
		lightA += dx * dy * dz * frame.lightsA[k];
		lightB += dx * dy * dz * frame.lightsB[k];
	}
	return
		core::clamp(core::round32(lightA), 0, 255) |
		core::clamp(core::round32(lightB), 0, 255) << 8;
}

// Calculates vertex color to be used in mapblock mesh
//  frame        - light values from getSmoothLightFrame()
//  vertex_pos   - vertex position in the node (coordinates are clamped to [0.0, 1.0] or so)
//  tile_color   - node's tile color
static video::SColor blendLight(const LightFrame &frame,
	const core::vector3df& vertex_pos, video::SColor tile_color)
{
	u16 light = blendLight(frame, vertex_pos);
	return encode_light_and_color(light, tile_color, frame.light_source);
}

static video::SColor blendLight(const LightFrame &frame,
	const core::vector3df& vertex_pos, const core::vector3df& vertex_normal,
	video::SColor tile_color)
{
	video::SColor color = blendLight(frame, vertex_pos, tile_color);
	if (!frame.light_source)
			applyFacesShading(color, vertex_normal);
	return color;
}

static inline void getNeighborConnectingFace(v3s16 p, INodeDefManager *nodedef,
		MeshMakeData *data, MapNode n, int v, int *neighbors)
{
	MapNode n2 = data->m_vmanip.getNodeNoEx(p);
	if (nodedef->nodeboxConnects(n, n2, v))
		*neighbors |= v;
}

static void makeAutoLightedCuboid(MeshCollector *collector, MeshMakeData *data,
	const v3f &pos, aabb3f box, TileSpec &tile,
	/* pre-computed, for non-smooth lighting only */ const video::SColor color,
	/* for smooth lighting only */ const LightFrame &frame)
{
	f32 dx1 = box.MinEdge.X;
	f32 dy1 = box.MinEdge.Y;
	f32 dz1 = box.MinEdge.Z;
	f32 dx2 = box.MaxEdge.X;
	f32 dy2 = box.MaxEdge.Y;
	f32 dz2 = box.MaxEdge.Z;
	box.MinEdge += pos;
	box.MaxEdge += pos;
	f32 tx1 = (box.MinEdge.X / BS) + 0.5;
	f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
	f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
	f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
	f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
	f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;
	f32 txc[24] = {
		  tx1, 1-tz2,   tx2, 1-tz1, // up
		  tx1,   tz1,   tx2,   tz2, // down
		  tz1, 1-ty2,   tz2, 1-ty1, // right
		1-tz2, 1-ty2, 1-tz1, 1-ty1, // left
		1-tx2, 1-ty2, 1-tx1, 1-ty1, // back
		  tx1, 1-ty2,   tx2, 1-ty1, // front
	};
	if (data->m_smooth_lighting) {
		u16 lights[8];
		for (int j = 0; j < 8; ++j) {
			f32 x = (j & 4) ? dx2 : dx1;
			f32 y = (j & 2) ? dy2 : dy1;
			f32 z = (j & 1) ? dz2 : dz1;
			lights[j] = blendLight(frame, core::vector3df(x, y, z));
		}
		makeSmoothLightedCuboid(collector, box, &tile, 1, lights, txc, frame.light_source);
	} else {
		makeCuboid(collector, box, &tile, 1, color, txc, frame.light_source);
	}
}

static void makeAutoLightedCuboidEx(MeshCollector *collector, MeshMakeData *data,
	const v3f &pos, aabb3f box, TileSpec &tile, f32 *txc,
	/* pre-computed, for non-smooth lighting only */ const video::SColor color,
	/* for smooth lighting only */ const LightFrame &frame)
{
	f32 dx1 = box.MinEdge.X;
	f32 dy1 = box.MinEdge.Y;
	f32 dz1 = box.MinEdge.Z;
	f32 dx2 = box.MaxEdge.X;
	f32 dy2 = box.MaxEdge.Y;
	f32 dz2 = box.MaxEdge.Z;
	box.MinEdge += pos;
	box.MaxEdge += pos;
	if (data->m_smooth_lighting) {
		u16 lights[8];
		for (int j = 0; j < 8; ++j) {
			f32 x = (j & 4) ? dx2 : dx1;
			f32 y = (j & 2) ? dy2 : dy1;
			f32 z = (j & 1) ? dz2 : dz1;
			lights[j] = blendLight(frame, core::vector3df(x, y, z));
		}
		makeSmoothLightedCuboid(collector, box, &tile, 1, lights, txc, frame.light_source);
	} else {
		makeCuboid(collector, box, &tile, 1, color, txc, frame.light_source);
	}
}

// For use in mapblock_mesh_generate_special
// X,Y,Z of position must be -1,0,1
// This expression is a simplification of
// 3 * 3 * (pos.X + 1) + 3 * (pos.Y + 1) + (pos.Z + 1)
static inline int NeighborToIndex(const v3s16 &pos)
{
	return 9 * pos.X + 3 * pos.Y + pos.Z + 13;
}

/*!
 * Returns the i-th special tile for a map node.
 */
static TileSpec getSpecialTile(const ContentFeatures &f,
	const MapNode &n, u8 i)
{
	TileSpec copy = f.special_tiles[i];
	if (!copy.has_color)
		n.getColor(f, &copy.color);
	return copy;
}

/*
	TODO: Fix alpha blending for special nodes
	Currently only the last element rendered is blended correct
*/
void mapblock_mesh_generate_special(MeshMakeData *data,
		MeshCollector &collector)
{
	INodeDefManager *nodedef = data->m_client->ndef();
	scene::ISceneManager* smgr = data->m_client->getSceneManager();
	scene::IMeshManipulator* meshmanip = smgr->getMeshManipulator();

	// 0ms
	//TimeTaker timer("mapblock_mesh_generate_special()");

	/*
		Some settings
	*/
	bool enable_mesh_cache	= g_settings->getBool("enable_mesh_cache") &&
		!data->m_smooth_lighting; // Mesh cache is not supported with smooth lighting

	v3s16 blockpos_nodes = data->m_blockpos*MAP_BLOCKSIZE;

	for(s16 z = 0; z < MAP_BLOCKSIZE; z++)
	for(s16 y = 0; y < MAP_BLOCKSIZE; y++)
	for(s16 x = 0; x < MAP_BLOCKSIZE; x++)
	{
		v3s16 p(x,y,z);

		MapNode n = data->m_vmanip.getNodeNoEx(blockpos_nodes + p);
		const ContentFeatures &f = nodedef->get(n);

		// Only solidness=0 stuff is drawn here
		if(f.solidness != 0)
			continue;

		if (f.drawtype == NDT_AIRLIKE)
			continue;

		LightFrame frame;
		if (data->m_smooth_lighting)
			getSmoothLightFrame(&frame, blockpos_nodes + p, data, f.light_source);
		else
			frame.light_source = f.light_source;

		switch(f.drawtype) {
		default:
			infostream << "Got " << f.drawtype << std::endl;
			FATAL_ERROR("Unknown drawtype");
			break;
		case NDT_LIQUID:
		{
			/*
				Add water sources to mesh if using new style
			*/
			TileSpec tile_liquid = getSpecialTile(f, n, 0);
			TileSpec tile_liquid_bfculled = getNodeTile(n, p, v3s16(0,0,0), data);
			u16 l = getInteriorLight(n, 0, nodedef);
			video::SColor c1 = encode_light_and_color(l,
				tile_liquid.color, f.light_source);
			video::SColor c2 = encode_light_and_color(l,
				tile_liquid_bfculled.color, f.light_source);

			bool top_is_same_liquid = false;
			MapNode ntop = data->m_vmanip.getNodeNoEx(blockpos_nodes + v3s16(x,y+1,z));
			content_t c_flowing = nodedef->getId(f.liquid_alternative_flowing);
			content_t c_source = nodedef->getId(f.liquid_alternative_source);
			if(ntop.getContent() == c_flowing || ntop.getContent() == c_source)
				top_is_same_liquid = true;

			/*
				Generate sides
			 */
			v3s16 side_dirs[4] = {
				v3s16(1,0,0),
				v3s16(-1,0,0),
				v3s16(0,0,1),
				v3s16(0,0,-1),
			};
			for(u32 i=0; i<4; i++)
			{
				v3s16 dir = side_dirs[i];

				MapNode neighbor = data->m_vmanip.getNodeNoEx(blockpos_nodes + p + dir);
				content_t neighbor_content = neighbor.getContent();
				const ContentFeatures &n_feat = nodedef->get(neighbor_content);
				MapNode n_top = data->m_vmanip.getNodeNoEx(blockpos_nodes + p + dir+ v3s16(0,1,0));
				content_t n_top_c = n_top.getContent();

				if(neighbor_content == CONTENT_IGNORE)
					continue;

				/*
					If our topside is liquid and neighbor's topside
					is liquid, don't draw side face
				*/
				if(top_is_same_liquid && (n_top_c == c_flowing ||
						n_top_c == c_source || n_top_c == CONTENT_IGNORE))
					continue;

				// Don't draw face if neighbor is blocking the view
				if(n_feat.solidness == 2)
					continue;

				bool neighbor_is_same_liquid = (neighbor_content == c_source
						|| neighbor_content == c_flowing);

				// Don't draw any faces if neighbor same is liquid and top is
				// same liquid
				if(neighbor_is_same_liquid && !top_is_same_liquid)
					continue;

				// Use backface culled material if neighbor doesn't have a
				// solidness of 0
				const TileSpec *current_tile = &tile_liquid;
				video::SColor *c = &c1;
				if(n_feat.solidness != 0 || n_feat.visual_solidness != 0) {
					current_tile = &tile_liquid_bfculled;
					c = &c2;
				}

				video::S3DVertex vertices[4] =
				{
					video::S3DVertex(-BS/2,0,BS/2,0,0,0, *c, 0,1),
					video::S3DVertex(BS/2,0,BS/2,0,0,0, *c, 1,1),
					video::S3DVertex(BS/2,0,BS/2, 0,0,0, *c, 1,0),
					video::S3DVertex(-BS/2,0,BS/2, 0,0,0, *c, 0,0),
				};

				/*
					If our topside is liquid, set upper border of face
					at upper border of node
				*/
				if (top_is_same_liquid) {
					vertices[2].Pos.Y = 0.5 * BS;
					vertices[3].Pos.Y = 0.5 * BS;
				} else {
				/*
					Otherwise upper position of face is liquid level
				*/
					vertices[2].Pos.Y = 0.5 * BS;
					vertices[3].Pos.Y = 0.5 * BS;
				}
				/*
					If neighbor is liquid, lower border of face is liquid level
				*/
				if (neighbor_is_same_liquid) {
					vertices[0].Pos.Y = 0.5 * BS;
					vertices[1].Pos.Y = 0.5 * BS;
				} else {
				/*
					If neighbor is not liquid, lower border of face is
					lower border of node
				*/
					vertices[0].Pos.Y = -0.5 * BS;
					vertices[1].Pos.Y = -0.5 * BS;
				}

				for (s32 j = 0; j < 4; j++) {
					if(dir == v3s16(0,0,1))
						vertices[j].Pos.rotateXZBy(0);
					if(dir == v3s16(0,0,-1))
						vertices[j].Pos.rotateXZBy(180);
					if(dir == v3s16(-1,0,0))
						vertices[j].Pos.rotateXZBy(90);
					if(dir == v3s16(1,0,-0))
						vertices[j].Pos.rotateXZBy(-90);

					// Do this to not cause glitches when two liquids are
					// side-by-side
					/*if(neighbor_is_same_liquid == false){
						vertices[j].Pos.X *= 0.98;
						vertices[j].Pos.Z *= 0.98;
					}*/

					if (data->m_smooth_lighting)
						vertices[j].Color = blendLight(frame, vertices[j].Pos, current_tile->color);
					vertices[j].Pos += intToFloat(p, BS);
				}

				u16 indices[] = {0,1,2,2,3,0};
				// Add to mesh collector
				collector.append(*current_tile, vertices, 4, indices, 6);
			}

			/*
				Generate top
			 */
			if(top_is_same_liquid)
				continue;

			video::S3DVertex vertices[4] =
			{
				video::S3DVertex(-BS/2,0,BS/2, 0,0,0, c1, 0,1),
				video::S3DVertex(BS/2,0,BS/2, 0,0,0, c1, 1,1),
				video::S3DVertex(BS/2,0,-BS/2, 0,0,0, c1, 1,0),
				video::S3DVertex(-BS/2,0,-BS/2, 0,0,0, c1, 0,0),
			};

			for (s32 i = 0; i < 4; i++) {
				vertices[i].Pos.Y += 0.5 * BS;
				if (data->m_smooth_lighting)
					vertices[i].Color = blendLight(frame, vertices[i].Pos, tile_liquid.color);
				vertices[i].Pos += intToFloat(p, BS);
			}

			u16 indices[] = {0,1,2,2,3,0};
			// Add to mesh collector
			collector.append(tile_liquid, vertices, 4, indices, 6);
		break;}
		case NDT_FLOWINGLIQUID:
		{
			/*
				Add flowing liquid to mesh
			*/
			TileSpec tile_liquid = getSpecialTile(f, n, 0);
			TileSpec tile_liquid_bfculled = getSpecialTile(f, n, 1);

			bool top_is_same_liquid = false;
			MapNode ntop = data->m_vmanip.getNodeNoEx(blockpos_nodes + v3s16(x,y+1,z));
			content_t c_flowing = nodedef->getId(f.liquid_alternative_flowing);
			content_t c_source = nodedef->getId(f.liquid_alternative_source);
			if(ntop.getContent() == c_flowing || ntop.getContent() == c_source)
				top_is_same_liquid = true;

			u16 l = 0;
			// If this liquid emits light and doesn't contain light, draw
			// it at what it emits, for an increased effect
			u8 light_source = nodedef->get(n).light_source;
			if(light_source != 0){
				l = decode_light(light_source);
				l = l | (l<<8);
			}
			// Use the light of the node on top if possible
			else if(nodedef->get(ntop).param_type == CPT_LIGHT)
				l = getInteriorLight(ntop, 0, nodedef);
			// Otherwise use the light of this node (the liquid)
			else
				l = getInteriorLight(n, 0, nodedef);
			video::SColor c1 = encode_light_and_color(l,
				tile_liquid.color, f.light_source);
			video::SColor c2 = encode_light_and_color(l,
				tile_liquid_bfculled.color, f.light_source);

			u8 range = rangelim(nodedef->get(c_flowing).liquid_range, 1, 8);

			// Neighbor liquid levels (key = relative position)
			// Includes current node

			struct NeighborData {
				f32 level;
				content_t content;
				u8 flags;
			};
			NeighborData neighbor_data_matrix[27];

			const u8 neighborflag_top_is_same_liquid = 0x01;
			v3s16 neighbor_dirs[9] = {
				v3s16(0,0,0),
				v3s16(0,0,1),
				v3s16(0,0,-1),
				v3s16(1,0,0),
				v3s16(-1,0,0),
				v3s16(1,0,1),
				v3s16(-1,0,-1),
				v3s16(1,0,-1),
				v3s16(-1,0,1),
			};
			for(u32 i=0; i<9; i++)
			{
				content_t content = CONTENT_AIR;
				float level = -0.5 * BS;
				u8 flags = 0;
				// Check neighbor
				v3s16 p2 = p + neighbor_dirs[i];
				MapNode n2 = data->m_vmanip.getNodeNoEx(blockpos_nodes + p2);
				if(n2.getContent() != CONTENT_IGNORE)
				{
					content = n2.getContent();

					if(n2.getContent() == c_source)
						level = 0.5 * BS;
					else if(n2.getContent() == c_flowing){
						u8 liquid_level = (n2.param2&LIQUID_LEVEL_MASK);
						if (liquid_level <= LIQUID_LEVEL_MAX+1-range)
							liquid_level = 0;
						else
							liquid_level -= (LIQUID_LEVEL_MAX+1-range);
						level = (-0.5 + ((float)liquid_level + 0.5) / (float)range) * BS;
					}

					// Check node above neighbor.
					// NOTE: This doesn't get executed if neighbor
					//       doesn't exist
					p2.Y += 1;
					n2 = data->m_vmanip.getNodeNoEx(blockpos_nodes + p2);
					if(n2.getContent() == c_source ||
							n2.getContent() == c_flowing)
						flags |= neighborflag_top_is_same_liquid;
				}

				NeighborData &neighbor_data =
					neighbor_data_matrix[NeighborToIndex(neighbor_dirs[i])];

				neighbor_data.level = level;
				neighbor_data.content = content;
				neighbor_data.flags = flags;
			}

			// Corner heights (average between four liquids)
			f32 corner_levels[4];

			v3s16 halfdirs[4] = {
				v3s16(0,0,0),
				v3s16(1,0,0),
				v3s16(1,0,1),
				v3s16(0,0,1),
			};
			for(u32 i=0; i<4; i++)
			{
				v3s16 cornerdir = halfdirs[i];
				float cornerlevel = 0;
				u32 valid_count = 0;
				u32 air_count = 0;
				for(u32 j=0; j<4; j++)
				{
					v3s16 neighbordir = cornerdir - halfdirs[j];

					NeighborData &neighbor_data =
						neighbor_data_matrix[NeighborToIndex(neighbordir)];
					content_t content = neighbor_data.content;
					// If top is liquid, draw starting from top of node
					if (neighbor_data.flags & neighborflag_top_is_same_liquid)
					{
						cornerlevel = 0.5*BS;
						valid_count = 1;
						break;
					}
					// Source is always the same height
					else if(content == c_source)
					{
						cornerlevel = 0.5 * BS;
						valid_count = 1;
						break;
					}
					// Flowing liquid has level information
					else if(content == c_flowing)
					{
						cornerlevel += neighbor_data.level;
						valid_count++;
					}
					else if(content == CONTENT_AIR)
					{
						air_count++;
					}
				}
				if(air_count >= 2)
					cornerlevel = -0.5*BS+0.2;
				else if(valid_count > 0)
					cornerlevel /= valid_count;
				corner_levels[i] = cornerlevel;
			}

			/*
				Generate sides
			*/

			v3s16 side_dirs[4] = {
				v3s16(1,0,0),
				v3s16(-1,0,0),
				v3s16(0,0,1),
				v3s16(0,0,-1),
			};
			s16 side_corners[4][2] = {
				{1, 2},
				{3, 0},
				{2, 3},
				{0, 1},
			};
			for(u32 i=0; i<4; i++)
			{
				v3s16 dir = side_dirs[i];

				NeighborData& neighbor_data =
					neighbor_data_matrix[NeighborToIndex(dir)];
				/*
					If our topside is liquid and neighbor's topside
					is liquid, don't draw side face
				*/
				if (top_is_same_liquid &&
						(neighbor_data.flags & neighborflag_top_is_same_liquid))
					continue;

				content_t neighbor_content = neighbor_data.content;
				const ContentFeatures &n_feat = nodedef->get(neighbor_content);

				// Don't draw face if neighbor is blocking the view
				if(n_feat.solidness == 2)
					continue;

				bool neighbor_is_same_liquid = (neighbor_content == c_source
						|| neighbor_content == c_flowing);

				// Don't draw any faces if neighbor same is liquid and top is
				// same liquid
				if(neighbor_is_same_liquid == true
						&& top_is_same_liquid == false)
					continue;

				// Use backface culled material if neighbor doesn't have a
				// solidness of 0
				const TileSpec *current_tile = &tile_liquid;
				video::SColor *c = &c1;
				if(n_feat.solidness != 0 || n_feat.visual_solidness != 0) {
					current_tile = &tile_liquid_bfculled;
					c = &c2;
				}

				video::S3DVertex vertices[4] =
				{
					video::S3DVertex(-BS/2,0,BS/2, 0,0,0, *c, 0,1),
					video::S3DVertex(BS/2,0,BS/2, 0,0,0, *c, 1,1),
					video::S3DVertex(BS/2,0,BS/2, 0,0,0, *c, 1,0),
					video::S3DVertex(-BS/2,0,BS/2, 0,0,0, *c, 0,0),
				};

				/*
					If our topside is liquid, set upper border of face
					at upper border of node
				*/
				if(top_is_same_liquid)
				{
					vertices[2].Pos.Y = 0.5*BS;
					vertices[3].Pos.Y = 0.5*BS;
				}
				/*
					Otherwise upper position of face is corner levels
				*/
				else
				{
					vertices[2].Pos.Y = corner_levels[side_corners[i][0]];
					vertices[3].Pos.Y = corner_levels[side_corners[i][1]];
				}

				/*
					If neighbor is liquid, lower border of face is corner
					liquid levels
				*/
				if(neighbor_is_same_liquid)
				{
					vertices[0].Pos.Y = corner_levels[side_corners[i][1]];
					vertices[1].Pos.Y = corner_levels[side_corners[i][0]];
				}
				/*
					If neighbor is not liquid, lower border of face is
					lower border of node
				*/
				else
				{
					vertices[0].Pos.Y = -0.5*BS;
					vertices[1].Pos.Y = -0.5*BS;
				}

				for(s32 j=0; j<4; j++)
				{
					if(dir == v3s16(0,0,1))
						vertices[j].Pos.rotateXZBy(0);
					if(dir == v3s16(0,0,-1))
						vertices[j].Pos.rotateXZBy(180);
					if(dir == v3s16(-1,0,0))
						vertices[j].Pos.rotateXZBy(90);
					if(dir == v3s16(1,0,-0))
						vertices[j].Pos.rotateXZBy(-90);

					// Do this to not cause glitches when two liquids are
					// side-by-side
					/*if(neighbor_is_same_liquid == false){
						vertices[j].Pos.X *= 0.98;
						vertices[j].Pos.Z *= 0.98;
					}*/

					if (data->m_smooth_lighting)
						vertices[j].Color = blendLight(frame, vertices[j].Pos, current_tile->color);
					vertices[j].Pos += intToFloat(p, BS);
				}

				u16 indices[] = {0,1,2,2,3,0};
				// Add to mesh collector
				collector.append(*current_tile, vertices, 4, indices, 6);
			}

			/*
				Generate top side, if appropriate
			*/

			if(top_is_same_liquid == false)
			{
				video::S3DVertex vertices[4] =
				{
					video::S3DVertex(-BS/2,0,BS/2, 0,0,0, c1, 0,1),
					video::S3DVertex(BS/2,0,BS/2, 0,0,0, c1, 1,1),
					video::S3DVertex(BS/2,0,-BS/2, 0,0,0, c1, 1,0),
					video::S3DVertex(-BS/2,0,-BS/2, 0,0,0, c1, 0,0),
				};

				// To get backface culling right, the vertices need to go
				// clockwise around the front of the face. And we happened to
				// calculate corner levels in exact reverse order.
				s32 corner_resolve[4] = {3,2,1,0};

				for(s32 i=0; i<4; i++)
				{
					//vertices[i].Pos.Y += liquid_level;
					//vertices[i].Pos.Y += neighbor_levels[v3s16(0,0,0)];
					s32 j = corner_resolve[i];
					vertices[i].Pos.Y += corner_levels[j];
					if (data->m_smooth_lighting)
						vertices[i].Color = blendLight(frame, vertices[i].Pos, tile_liquid.color);
					vertices[i].Pos += intToFloat(p, BS);
				}

				// Default downwards-flowing texture animation goes from
				// -Z towards +Z, thus the direction is +Z.
				// Rotate texture to make animation go in flow direction
				// Positive if liquid moves towards +Z
				f32 dz = (corner_levels[side_corners[3][0]] +
						corner_levels[side_corners[3][1]]) -
						(corner_levels[side_corners[2][0]] +
						corner_levels[side_corners[2][1]]);
				// Positive if liquid moves towards +X
				f32 dx = (corner_levels[side_corners[1][0]] +
						corner_levels[side_corners[1][1]]) -
						(corner_levels[side_corners[0][0]] +
						corner_levels[side_corners[0][1]]);
				f32 tcoord_angle = atan2(dz, dx) * core::RADTODEG ;
				v2f tcoord_center(0.5, 0.5);
				v2f tcoord_translate(
						blockpos_nodes.Z + z,
						blockpos_nodes.X + x);
				tcoord_translate.rotateBy(tcoord_angle);
				tcoord_translate.X -= floor(tcoord_translate.X);
				tcoord_translate.Y -= floor(tcoord_translate.Y);

				for(s32 i=0; i<4; i++)
				{
					vertices[i].TCoords.rotateBy(
							tcoord_angle,
							tcoord_center);
					vertices[i].TCoords += tcoord_translate;
				}

				v2f t = vertices[0].TCoords;
				vertices[0].TCoords = vertices[2].TCoords;
				vertices[2].TCoords = t;

				u16 indices[] = {0,1,2,2,3,0};
				// Add to mesh collector
				collector.append(tile_liquid, vertices, 4, indices, 6);
			}
		break;}
		case NDT_GLASSLIKE:
		{
			TileSpec tile = getNodeTile(n, p, v3s16(0,0,0), data);

			u16 l = getInteriorLight(n, 1, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);
			for(u32 j=0; j<6; j++)
			{
				// Check this neighbor
				v3s16 dir = g_6dirs[j];
				v3s16 n2p = blockpos_nodes + p + dir;
				MapNode n2 = data->m_vmanip.getNodeNoEx(n2p);
				// Don't make face if neighbor is of same type
				if(n2.getContent() == n.getContent())
					continue;
				video::SColor c2=c;
				if(!f.light_source)
					applyFacesShading(c2, v3f(dir.X, dir.Y, dir.Z));


				// The face at Z+
				video::S3DVertex vertices[4] = {
					video::S3DVertex(-BS/2,-BS/2,BS/2, dir.X,dir.Y,dir.Z, c2, 1,1),
					video::S3DVertex(BS/2,-BS/2,BS/2, dir.X,dir.Y,dir.Z, c2, 0,1),
					video::S3DVertex(BS/2,BS/2,BS/2, dir.X,dir.Y,dir.Z, c2, 0,0),
					video::S3DVertex(-BS/2,BS/2,BS/2, dir.X,dir.Y,dir.Z, c2, 1,0),
				};

				// Rotations in the g_6dirs format
				if(j == 0) // Z+
					for(u16 i=0; i<4; i++)
						vertices[i].Pos.rotateXZBy(0);
				else if(j == 1) // Y+
					for(u16 i=0; i<4; i++)
						vertices[i].Pos.rotateYZBy(-90);
				else if(j == 2) // X+
					for(u16 i=0; i<4; i++)
						vertices[i].Pos.rotateXZBy(-90);
				else if(j == 3) // Z-
					for(u16 i=0; i<4; i++)
						vertices[i].Pos.rotateXZBy(180);
				else if(j == 4) // Y-
					for(u16 i=0; i<4; i++)
						vertices[i].Pos.rotateYZBy(90);
				else if(j == 5) // X-
					for(u16 i=0; i<4; i++)
						vertices[i].Pos.rotateXZBy(90);

				for (u16 i = 0; i < 4; i++) {
					if (data->m_smooth_lighting)
						vertices[i].Color = blendLight(frame, vertices[i].Pos, vertices[i].Normal, tile.color);
					vertices[i].Pos += intToFloat(p, BS);
				}

				u16 indices[] = {0,1,2,2,3,0};
				// Add to mesh collector
				collector.append(tile, vertices, 4, indices, 6);
			}
		break;}
		case NDT_GLASSLIKE_FRAMED_OPTIONAL:
			// This is always pre-converted to something else
			FATAL_ERROR("NDT_GLASSLIKE_FRAMED_OPTIONAL not pre-converted as expected");
			break;
		case NDT_GLASSLIKE_FRAMED:
		{
			static const v3s16 dirs[6] = {
				v3s16( 0, 1, 0),
				v3s16( 0,-1, 0),
				v3s16( 1, 0, 0),
				v3s16(-1, 0, 0),
				v3s16( 0, 0, 1),
				v3s16( 0, 0,-1)
			};

			u16 l = getInteriorLight(n, 1, nodedef);
			u8 i;
			TileSpec tiles[6];
			for (i = 0; i < 6; i++)
				tiles[i] = getNodeTile(n, p, dirs[i], data);

			video::SColor tile0color = encode_light_and_color(l,
				tiles[0].color, f.light_source);

			TileSpec glass_tiles[6];
			video::SColor glasscolor[6];
			if (tiles[1].texture && tiles[2].texture && tiles[3].texture) {
				glass_tiles[0] = tiles[2];
				glass_tiles[1] = tiles[3];
				glass_tiles[2] = tiles[1];
				glass_tiles[3] = tiles[1];
				glass_tiles[4] = tiles[1];
				glass_tiles[5] = tiles[1];
			} else {
				for (i = 0; i < 6; i++)
					glass_tiles[i] = tiles[1];
			}
			for (i = 0; i < 6; i++)
				glasscolor[i] = encode_light_and_color(l, glass_tiles[i].color,
					f.light_source);

			u8 param2 = n.getParam2();
			bool H_merge = ! bool(param2 & 128);
			bool V_merge = ! bool(param2 & 64);
			param2  = param2 & 63;

			v3f pos = intToFloat(p, BS);
			static const float a = BS / 2;
			static const float g = a - 0.003;
			static const float b = .876 * ( BS / 2 );

			static const aabb3f frame_edges[12] = {
				aabb3f( b, b,-a, a, a, a), // y+
				aabb3f(-a, b,-a,-b, a, a), // y+
				aabb3f( b,-a,-a, a,-b, a), // y-
				aabb3f(-a,-a,-a,-b,-b, a), // y-
				aabb3f( b,-a, b, a, a, a), // x+
				aabb3f( b,-a,-a, a, a,-b), // x+
				aabb3f(-a,-a, b,-b, a, a), // x-
				aabb3f(-a,-a,-a,-b, a,-b), // x-
				aabb3f(-a, b, b, a, a, a), // z+
				aabb3f(-a,-a, b, a,-b, a), // z+
				aabb3f(-a,-a,-a, a,-b,-b), // z-
				aabb3f(-a, b,-a, a, a,-b)  // z-
			};
			static const aabb3f glass_faces[6] = {
				aabb3f(-g, g,-g, g, g, g), // y+
				aabb3f(-g,-g,-g, g,-g, g), // y-
				aabb3f( g,-g,-g, g, g, g), // x+
				aabb3f(-g,-g,-g,-g, g, g), // x-
				aabb3f(-g,-g, g, g, g, g), // z+
				aabb3f(-g,-g,-g, g, g,-g)  // z-
			};

			// table of node visible faces, 0 = invisible
			int visible_faces[6] = {0,0,0,0,0,0};

			// table of neighbours, 1 = same type, checked with g_26dirs
			int nb[18] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

			// g_26dirs to check when only horizontal merge is allowed
			int nb_H_dirs[8] = {0,2,3,5,10,11,12,13};

			content_t current = n.getContent();
			content_t n2c;
			MapNode n2;
			v3s16 n2p;

			// neighbours checks for frames visibility

			if (!H_merge && V_merge) {
				n2p = blockpos_nodes + p + g_26dirs[1];
				n2 = data->m_vmanip.getNodeNoEx(n2p);
				n2c = n2.getContent();
				if (n2c == current || n2c == CONTENT_IGNORE)
					nb[1] = 1;
				n2p = blockpos_nodes + p + g_26dirs[4];
				n2 = data->m_vmanip.getNodeNoEx(n2p);
				n2c = n2.getContent();
				if (n2c == current || n2c == CONTENT_IGNORE)
					nb[4] = 1;
			} else if (H_merge && !V_merge) {
				for(i = 0; i < 8; i++) {
					n2p = blockpos_nodes + p + g_26dirs[nb_H_dirs[i]];
					n2 = data->m_vmanip.getNodeNoEx(n2p);
					n2c = n2.getContent();
					if (n2c == current || n2c == CONTENT_IGNORE)
						nb[nb_H_dirs[i]] = 1;
				}
			} else if (H_merge && V_merge) {
				for(i = 0; i < 18; i++)	{
					n2p = blockpos_nodes + p + g_26dirs[i];
					n2 = data->m_vmanip.getNodeNoEx(n2p);
					n2c = n2.getContent();
					if (n2c == current || n2c == CONTENT_IGNORE)
						nb[i] = 1;
				}
			}

			// faces visibility checks

			if (!V_merge) {
				visible_faces[0] = 1;
				visible_faces[1] = 1;
			} else {
				for(i = 0; i < 2; i++) {
					n2p = blockpos_nodes + p + dirs[i];
					n2 = data->m_vmanip.getNodeNoEx(n2p);
					n2c = n2.getContent();
					if (n2c != current)
						visible_faces[i] = 1;
				}
			}

			if (!H_merge) {
				visible_faces[2] = 1;
				visible_faces[3] = 1;
				visible_faces[4] = 1;
				visible_faces[5] = 1;
			} else {
				for(i = 2; i < 6; i++) {
					n2p = blockpos_nodes + p + dirs[i];
					n2 = data->m_vmanip.getNodeNoEx(n2p);
					n2c = n2.getContent();
					if (n2c != current)
						visible_faces[i] = 1;
				}
			}

			static const u8 nb_triplet[12*3] = {
				1,2, 7,  1,5, 6,  4,2,15,  4,5,14,
				2,0,11,  2,3,13,  5,0,10,  5,3,12,
				0,1, 8,  0,4,16,  3,4,17,  3,1, 9
			};

			aabb3f box;

			for(i = 0; i < 12; i++)
			{
				int edge_invisible;
				if (nb[nb_triplet[i*3+2]])
					edge_invisible = nb[nb_triplet[i*3]] & nb[nb_triplet[i*3+1]];
				else
					edge_invisible = nb[nb_triplet[i*3]] ^ nb[nb_triplet[i*3+1]];
				if (edge_invisible)
					continue;
				box = frame_edges[i];
				makeAutoLightedCuboid(&collector, data, pos, box, tiles[0], tile0color, frame);
			}

			for(i = 0; i < 6; i++)
			{
				if (!visible_faces[i])
					continue;
				box = glass_faces[i];
				makeAutoLightedCuboid(&collector, data, pos, box, glass_tiles[i], glasscolor[i], frame);
			}

			if (param2 > 0 && f.special_tiles[0].texture) {
				// Interior volume level is in range 0 .. 63,
				// convert it to -0.5 .. 0.5
				float vlev = (((float)param2 / 63.0 ) * 2.0 - 1.0);
				TileSpec tile = getSpecialTile(f, n, 0);
				video::SColor special_color = encode_light_and_color(l,
					tile.color, f.light_source);
				float offset = 0.003;
				box = aabb3f(visible_faces[3] ? -b : -a + offset,
							 visible_faces[1] ? -b : -a + offset,
							 visible_faces[5] ? -b : -a + offset,
							 visible_faces[2] ? b : a - offset,
							 visible_faces[0] ? b * vlev : a * vlev - offset,
							 visible_faces[4] ? b : a - offset);
				makeAutoLightedCuboid(&collector, data, pos, box, tile, special_color, frame);
			}
		break;}
		case NDT_ALLFACES:
		{
			TileSpec tile_leaves = getNodeTile(n, p,
					v3s16(0,0,0), data);
			u16 l = getInteriorLight(n, 1, nodedef);
			video::SColor c = encode_light_and_color(l,
				tile_leaves.color, f.light_source);

			v3f pos = intToFloat(p, BS);
			aabb3f box(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2);
			makeAutoLightedCuboid(&collector, data, pos, box, tile_leaves, c, frame);
		break;}
		case NDT_ALLFACES_OPTIONAL:
			// This is always pre-converted to something else
			FATAL_ERROR("NDT_ALLFACES_OPTIONAL not pre-converted");
			break;
		case NDT_TORCHLIKE:
		{
			v3s16 dir = n.getWallMountedDir(nodedef);

			u8 tileindex = 0;
			if(dir == v3s16(0,-1,0)){
				tileindex = 0; // floor
			} else if(dir == v3s16(0,1,0)){
				tileindex = 1; // ceiling
			// For backwards compatibility
			} else if(dir == v3s16(0,0,0)){
				tileindex = 0; // floor
			} else {
				tileindex = 2; // side
			}

			TileSpec tile = getNodeTileN(n, p, tileindex, data);
			tile.material_flags &= ~MATERIAL_FLAG_BACKFACE_CULLING;
			tile.material_flags |= MATERIAL_FLAG_CRACK_OVERLAY;

			u16 l = getInteriorLight(n, 1, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);

			float s = BS/2*f.visual_scale;
			// Wall at X+ of node
			video::S3DVertex vertices[4] =
			{
				video::S3DVertex(-s,-s,0, 0,0,0, c, 0,1),
				video::S3DVertex( s,-s,0, 0,0,0, c, 1,1),
				video::S3DVertex( s, s,0, 0,0,0, c, 1,0),
				video::S3DVertex(-s, s,0, 0,0,0, c, 0,0),
			};

			for (s32 i = 0; i < 4; i++)
			{
				if(dir == v3s16(1,0,0))
					vertices[i].Pos.rotateXZBy(0);
				if(dir == v3s16(-1,0,0))
					vertices[i].Pos.rotateXZBy(180);
				if(dir == v3s16(0,0,1))
					vertices[i].Pos.rotateXZBy(90);
				if(dir == v3s16(0,0,-1))
					vertices[i].Pos.rotateXZBy(-90);
				if(dir == v3s16(0,-1,0))
					vertices[i].Pos.rotateXZBy(45);
				if(dir == v3s16(0,1,0))
					vertices[i].Pos.rotateXZBy(-45);

				if (data->m_smooth_lighting)
					vertices[i].Color = blendLight(frame, vertices[i].Pos, tile.color);
				vertices[i].Pos += intToFloat(p, BS);
			}

			u16 indices[] = {0,1,2,2,3,0};
			// Add to mesh collector
			collector.append(tile, vertices, 4, indices, 6);
		break;}
		case NDT_SIGNLIKE:
		{
			TileSpec tile = getNodeTileN(n, p, 0, data);
			tile.material_flags &= ~MATERIAL_FLAG_BACKFACE_CULLING;
			tile.material_flags |= MATERIAL_FLAG_CRACK_OVERLAY;

			u16 l = getInteriorLight(n, 0, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);

			float d = (float)BS/16;
			float s = BS/2*f.visual_scale;
			// Wall at X+ of node
			video::S3DVertex vertices[4] =
			{
				video::S3DVertex(BS/2-d,  s,  s, 0,0,0, c, 0,0),
				video::S3DVertex(BS/2-d,  s, -s, 0,0,0, c, 1,0),
				video::S3DVertex(BS/2-d, -s, -s, 0,0,0, c, 1,1),
				video::S3DVertex(BS/2-d, -s,  s, 0,0,0, c, 0,1),
			};

			v3s16 dir = n.getWallMountedDir(nodedef);

			for (s32 i = 0; i < 4; i++)
			{
				if(dir == v3s16(1,0,0))
					vertices[i].Pos.rotateXZBy(0);
				if(dir == v3s16(-1,0,0))
					vertices[i].Pos.rotateXZBy(180);
				if(dir == v3s16(0,0,1))
					vertices[i].Pos.rotateXZBy(90);
				if(dir == v3s16(0,0,-1))
					vertices[i].Pos.rotateXZBy(-90);
				if(dir == v3s16(0,-1,0))
					vertices[i].Pos.rotateXYBy(-90);
				if(dir == v3s16(0,1,0))
					vertices[i].Pos.rotateXYBy(90);

				if (data->m_smooth_lighting)
					vertices[i].Color = blendLight(frame, vertices[i].Pos, tile.color);
				vertices[i].Pos += intToFloat(p, BS);
			}

			u16 indices[] = {0,1,2,2,3,0};
			// Add to mesh collector
			collector.append(tile, vertices, 4, indices, 6);
		break;}
		case NDT_PLANTLIKE:
		{
			PseudoRandom rng(x<<8 | z | y<<16);

			TileSpec tile = getNodeTileN(n, p, 0, data);
			tile.material_flags |= MATERIAL_FLAG_CRACK_OVERLAY;

			u16 l = getInteriorLight(n, 1, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);

			float s = BS / 2 * f.visual_scale;
			// add sqrt(2) visual scale
			if ((f.param_type_2 == CPT2_MESHOPTIONS) && ((n.param2 & 0x10) != 0))
				s *= 1.41421;

			float random_offset_X = .0;
			float random_offset_Z = .0;
			if ((f.param_type_2 == CPT2_MESHOPTIONS) && ((n.param2 & 0x8) != 0)) {
				random_offset_X = BS * ((rng.next() % 16 / 16.0) * 0.29 - 0.145);
				random_offset_Z = BS * ((rng.next() % 16 / 16.0) * 0.29 - 0.145);
			}

			for (int j = 0; j < 4; j++) {
				video::S3DVertex vertices[4] =
				{
					video::S3DVertex(-s,-BS/2, 0, 0,0,0, c, 0,1),
					video::S3DVertex( s,-BS/2, 0, 0,0,0, c, 1,1),
					video::S3DVertex( s,-BS/2 + s*2,0, 0,0,0, c, 1,0),
					video::S3DVertex(-s,-BS/2 + s*2,0, 0,0,0, c, 0,0),
				};

				float rotate_degree = 0;
				u8 p2mesh = 0;
				if (f.param_type_2 == CPT2_DEGROTATE)
					rotate_degree = n.param2 * 2;
				if (f.param_type_2 != CPT2_MESHOPTIONS) {
					if (j == 0) {
						for (u16 i = 0; i < 4; i++)
							vertices[i].Pos.rotateXZBy(46 + rotate_degree);
					} else if (j == 1) {
						for (u16 i = 0; i < 4; i++)
							vertices[i].Pos.rotateXZBy(-44 + rotate_degree);
					}
				} else {
					p2mesh = n.param2 & 0x7;
					switch (p2mesh) {
					case 0:
						// x
						if (j == 0) {
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(46);
						} else if (j == 1) {
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(-44);
						}
						break;
					case 1:
						// +
						if (j == 0) {
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(91);
						} else if (j == 1) {
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(1);
						}
						break;
					case 2:
						// *
						if (j == 0) {
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(121);
						} else if (j == 1) {
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(241);
						} else { // (j == 2)
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(1);
						}
						break;
					case 3:
						// #
						switch (j) {
						case 0:
							for (u16 i = 0; i < 4; i++) {
								vertices[i].Pos.rotateXZBy(1);
								vertices[i].Pos.Z += BS / 4;
							}
							break;
						case 1:
							for (u16 i = 0; i < 4; i++) {
								vertices[i].Pos.rotateXZBy(91);
								vertices[i].Pos.X += BS / 4;
							}
							break;
						case 2:
							for (u16 i = 0; i < 4; i++) {
								vertices[i].Pos.rotateXZBy(181);
								vertices[i].Pos.Z -= BS / 4;
							}
							break;
						case 3:
							for (u16 i = 0; i < 4; i++) {
								vertices[i].Pos.rotateXZBy(271);
								vertices[i].Pos.X -= BS / 4;
							}
							break;
						}
						break;
					case 4:
						// outward leaning #-like
						switch (j) {
						case 0:
							for (u16 i = 2; i < 4; i++)
								vertices[i].Pos.Z -= BS / 2;
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(1);
							break;
						case 1:
							for (u16 i = 2; i < 4; i++)
								vertices[i].Pos.Z -= BS / 2;
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(91);
							break;
						case 2:
							for (u16 i = 2; i < 4; i++)
								vertices[i].Pos.Z -= BS / 2;
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(181);
							break;
						case 3:
							for (u16 i = 2; i < 4; i++)
								vertices[i].Pos.Z -= BS / 2;
							for (u16 i = 0; i < 4; i++)
								vertices[i].Pos.rotateXZBy(271);
							break;
						}
						break;
					}
				}

				for (int i = 0; i < 4; i++) {
					vertices[i].Pos *= f.visual_scale;
					vertices[i].Pos.Y += BS/2 * (f.visual_scale - 1);
					if (data->m_smooth_lighting)
						vertices[i].Color = blendLight(frame, vertices[i].Pos, tile.color);
					vertices[i].Pos += intToFloat(p, BS);
					// move to a random spot to avoid moire
					if ((f.param_type_2 == CPT2_MESHOPTIONS) && ((n.param2 & 0x8) != 0)) {
						vertices[i].Pos.X += random_offset_X;
						vertices[i].Pos.Z += random_offset_Z;
					}
					// randomly move each face up/down
					if ((f.param_type_2 == CPT2_MESHOPTIONS) && ((n.param2 & 0x20) != 0)) {
						PseudoRandom yrng(j | x<<16 | z<<8 | y<<24 );
						vertices[i].Pos.Y -= BS * ((yrng.next() % 16 / 16.0) * 0.125);
					}
				}

				u16 indices[] = {0, 1, 2, 2, 3, 0};
				// Add to mesh collector
				collector.append(tile, vertices, 4, indices, 6);

				// stop adding faces for meshes with less than 4 faces
				if (f.param_type_2 == CPT2_MESHOPTIONS) {
					if (((p2mesh == 0) || (p2mesh == 1)) && (j == 1))
						break;
					else if ((p2mesh == 2) && (j == 2))
						break;
				} else if (j == 1) {
					break;
				}

			}
		break;}
		case NDT_FIRELIKE:
		{
			TileSpec tile = getNodeTileN(n, p, 0, data);
			tile.material_flags |= MATERIAL_FLAG_CRACK_OVERLAY;

			u16 l = getInteriorLight(n, 1, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);

			float s = BS / 2 * f.visual_scale;

			content_t current = n.getContent();
			content_t n2c;
			MapNode n2;
			v3s16 n2p;

			static const v3s16 dirs[6] = {
				v3s16( 0,  1,  0),
				v3s16( 0, -1,  0),
				v3s16( 1,  0,  0),
				v3s16(-1,  0,  0),
				v3s16( 0,  0,  1),
				v3s16( 0,  0, -1)
			};

			int doDraw[6] = {0, 0, 0, 0, 0, 0};

			bool drawAllFaces = true;

			// Check for adjacent nodes
			for (int i = 0; i < 6; i++) {
				n2p = blockpos_nodes + p + dirs[i];
				n2 = data->m_vmanip.getNodeNoEx(n2p);
				n2c = n2.getContent();
				if (n2c != CONTENT_IGNORE && n2c != CONTENT_AIR && n2c != current) {
					doDraw[i] = 1;
					if (drawAllFaces)
						drawAllFaces = false;

				}
			}

			for (int j = 0; j < 6; j++) {

				video::S3DVertex vertices[4] = {
					video::S3DVertex(-s, -BS / 2,         0, 0, 0, 0, c, 0, 1),
					video::S3DVertex( s, -BS / 2,         0, 0, 0, 0, c, 1, 1),
					video::S3DVertex( s, -BS / 2 + s * 2, 0, 0, 0, 0, c, 1, 0),
					video::S3DVertex(-s, -BS / 2 + s * 2, 0, 0, 0, 0, c, 0, 0),
				};

				// Calculate which faces should be drawn, (top or sides)
				if (j == 0 && (drawAllFaces ||
						(doDraw[3] == 1 || doDraw[1] == 1))) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateXZBy(90);
						vertices[i].Pos.rotateXYBy(-10);
						vertices[i].Pos.X -= 4.0;
					}
				} else if (j == 1 && (drawAllFaces ||
						(doDraw[5] == 1 || doDraw[1] == 1))) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateXZBy(180);
						vertices[i].Pos.rotateYZBy(10);
						vertices[i].Pos.Z -= 4.0;
					}
				} else if (j == 2 && (drawAllFaces ||
						(doDraw[2] == 1 || doDraw[1] == 1))) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateXZBy(270);
						vertices[i].Pos.rotateXYBy(10);
						vertices[i].Pos.X += 4.0;
					}
				} else if (j == 3 && (drawAllFaces ||
						(doDraw[4] == 1 || doDraw[1] == 1))) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateYZBy(-10);
						vertices[i].Pos.Z += 4.0;
					}
				// Center cross-flames
				} else if (j == 4 && (drawAllFaces || doDraw[1] == 1)) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateXZBy(45);
					}
				} else if (j == 5 && (drawAllFaces || doDraw[1] == 1)) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateXZBy(-45);
					}
				// Render flames on bottom of node above
				} else if (j == 0 && doDraw[0] == 1 && doDraw[1] == 0) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateYZBy(70);
						vertices[i].Pos.rotateXZBy(90);
						vertices[i].Pos.Y += 4.84;
						vertices[i].Pos.X -= 4.7;
					}
				} else if (j == 1 && doDraw[0] == 1 && doDraw[1] == 0) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateYZBy(70);
						vertices[i].Pos.rotateXZBy(180);
						vertices[i].Pos.Y += 4.84;
						vertices[i].Pos.Z -= 4.7;
					}
				} else if (j == 2 && doDraw[0] == 1 && doDraw[1] == 0) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateYZBy(70);
						vertices[i].Pos.rotateXZBy(270);
						vertices[i].Pos.Y += 4.84;
						vertices[i].Pos.X += 4.7;
					}
				} else if (j == 3 && doDraw[0] == 1 && doDraw[1] == 0) {
					for (int i = 0; i < 4; i++) {
						vertices[i].Pos.rotateYZBy(70);
						vertices[i].Pos.Y += 4.84;
						vertices[i].Pos.Z += 4.7;
					}
				} else {
					// Skip faces that aren't adjacent to a node
					continue;
				}

				for (int i = 0; i < 4; i++) {
					vertices[i].Pos *= f.visual_scale;
					if (data->m_smooth_lighting)
						vertices[i].Color = blendLight(frame, vertices[i].Pos, tile.color);
					vertices[i].Pos += intToFloat(p, BS);
				}

				u16 indices[] = {0, 1, 2, 2, 3, 0};
				// Add to mesh collector
				collector.append(tile, vertices, 4, indices, 6);
			}
		break;}
		case NDT_FENCELIKE:
		{
			TileSpec tile = getNodeTile(n, p, v3s16(0,0,0), data);
			TileSpec tile_nocrack = tile;
			tile_nocrack.material_flags &= ~MATERIAL_FLAG_CRACK;

			// Put wood the right way around in the posts
			TileSpec tile_rot = tile;
			tile_rot.rotation = 1;

			u16 l = getInteriorLight(n, 1, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);

			const f32 post_rad=(f32)BS/8;
			const f32 bar_rad=(f32)BS/16;
			const f32 bar_len=(f32)(BS/2)-post_rad;

			v3f pos = intToFloat(p, BS);

			// The post - always present
			aabb3f post(-post_rad,-BS/2,-post_rad,post_rad,BS/2,post_rad);
			f32 postuv[24]={
					6/16.,6/16.,10/16.,10/16.,
					6/16.,6/16.,10/16.,10/16.,
					0/16.,0,4/16.,1,
					4/16.,0,8/16.,1,
					8/16.,0,12/16.,1,
					12/16.,0,16/16.,1};
			makeAutoLightedCuboidEx(&collector, data, pos, post, tile_rot, postuv, c, frame);

			// Now a section of fence, +X, if there's a post there
			v3s16 p2 = p;
			p2.X++;
			MapNode n2 = data->m_vmanip.getNodeNoEx(blockpos_nodes + p2);
			const ContentFeatures *f2 = &nodedef->get(n2);
			if(f2->drawtype == NDT_FENCELIKE)
			{
				aabb3f bar(-bar_len+BS/2,-bar_rad+BS/4,-bar_rad,
						bar_len+BS/2,bar_rad+BS/4,bar_rad);
				f32 xrailuv[24]={
					0/16.,2/16.,16/16.,4/16.,
					0/16.,4/16.,16/16.,6/16.,
					6/16.,6/16.,8/16.,8/16.,
					10/16.,10/16.,12/16.,12/16.,
					0/16.,8/16.,16/16.,10/16.,
					0/16.,14/16.,16/16.,16/16.};
				makeAutoLightedCuboidEx(&collector, data, pos, bar, tile_nocrack, xrailuv, c, frame);
				bar.MinEdge.Y -= BS/2;
				bar.MaxEdge.Y -= BS/2;
				makeAutoLightedCuboidEx(&collector, data, pos, bar, tile_nocrack, xrailuv, c, frame);
			}

			// Now a section of fence, +Z, if there's a post there
			p2 = p;
			p2.Z++;
			n2 = data->m_vmanip.getNodeNoEx(blockpos_nodes + p2);
			f2 = &nodedef->get(n2);
			if(f2->drawtype == NDT_FENCELIKE)
			{
				aabb3f bar(-bar_rad,-bar_rad+BS/4,-bar_len+BS/2,
						bar_rad,bar_rad+BS/4,bar_len+BS/2);
				f32 zrailuv[24]={
					3/16.,1/16.,5/16.,5/16., // cannot rotate; stretch
					4/16.,1/16.,6/16.,5/16., // for wood texture instead
					0/16.,9/16.,16/16.,11/16.,
					0/16.,6/16.,16/16.,8/16.,
					6/16.,6/16.,8/16.,8/16.,
					10/16.,10/16.,12/16.,12/16.};
				makeAutoLightedCuboidEx(&collector, data, pos, bar, tile_nocrack, zrailuv, c, frame);
				bar.MinEdge.Y -= BS/2;
				bar.MaxEdge.Y -= BS/2;
				makeAutoLightedCuboidEx(&collector, data, pos, bar, tile_nocrack, zrailuv, c, frame);
			}
		break;}
		case NDT_RAILLIKE:
		{
			bool is_rail_x[6]; /* (-1,-1,0) X (1,-1,0) (-1,0,0) X (1,0,0) (-1,1,0) X (1,1,0) */
			bool is_rail_z[6];

			content_t thiscontent = n.getContent();
			std::string groupname = "connect_to_raillike"; // name of the group that enables connecting to raillike nodes of different kind
			int self_group = ((ItemGroupList) nodedef->get(n).groups)[groupname];

			u8 index = 0;
			for (s8 y0 = -1; y0 <= 1; y0++) {
				// Prevent from indexing never used coordinates
				for (s8 xz = -1; xz <= 1; xz++) {
					if (xz == 0)
						continue;
					MapNode n_xy = data->m_vmanip.getNodeNoEx(blockpos_nodes + v3s16(x + xz, y + y0, z));
					MapNode n_zy = data->m_vmanip.getNodeNoEx(blockpos_nodes + v3s16(x, y + y0, z + xz));
					const ContentFeatures &def_xy = nodedef->get(n_xy);
					const ContentFeatures &def_zy = nodedef->get(n_zy);

					// Check if current node would connect with the rail
					is_rail_x[index] = ((def_xy.drawtype == NDT_RAILLIKE
							&& ((ItemGroupList) def_xy.groups)[groupname] == self_group)
							|| n_xy.getContent() == thiscontent);

					is_rail_z[index] = ((def_zy.drawtype == NDT_RAILLIKE
							&& ((ItemGroupList) def_zy.groups)[groupname] == self_group)
							|| n_zy.getContent() == thiscontent);
					index++;
				}
			}

			bool is_rail_x_all[2]; // [0] = negative x, [1] = positive x coordinate from the current node position
			bool is_rail_z_all[2];
			is_rail_x_all[0] = is_rail_x[0] || is_rail_x[2] || is_rail_x[4];
			is_rail_x_all[1] = is_rail_x[1] || is_rail_x[3] || is_rail_x[5];
			is_rail_z_all[0] = is_rail_z[0] || is_rail_z[2] || is_rail_z[4];
			is_rail_z_all[1] = is_rail_z[1] || is_rail_z[3] || is_rail_z[5];

			// reasonable default, flat straight unrotated rail
			bool is_straight = true;
			int adjacencies = 0;
			int angle = 0;
			u8 tileindex = 0;

			// check for sloped rail
			if (is_rail_x[4] || is_rail_x[5] || is_rail_z[4] || is_rail_z[5]) {
				adjacencies = 5; // 5 means sloped
				is_straight = true; // sloped is always straight
			} else {
				// is really straight, rails on both sides
				is_straight = (is_rail_x_all[0] && is_rail_x_all[1]) || (is_rail_z_all[0] && is_rail_z_all[1]);
				adjacencies = is_rail_x_all[0] + is_rail_x_all[1] + is_rail_z_all[0] + is_rail_z_all[1];
			}

			switch (adjacencies) {
			case 1:
				if (is_rail_x_all[0] || is_rail_x_all[1])
					angle = 90;
				break;
			case 2:
				if (!is_straight)
					tileindex = 1; // curved
				if (is_rail_x_all[0] && is_rail_x_all[1])
					angle = 90;
				if (is_rail_z_all[0] && is_rail_z_all[1]) {
					if (is_rail_z[4])
						angle = 180;
				}
				else if (is_rail_x_all[0] && is_rail_z_all[0])
					angle = 270;
				else if (is_rail_x_all[0] && is_rail_z_all[1])
					angle = 180;
				else if (is_rail_x_all[1] && is_rail_z_all[1])
					angle = 90;
				break;
			case 3:
				// here is where the potential to 'switch' a junction is, but not implemented at present
				tileindex = 2; // t-junction
				if(!is_rail_x_all[1])
					angle = 180;
				if(!is_rail_z_all[0])
					angle = 90;
				if(!is_rail_z_all[1])
					angle = 270;
				break;
			case 4:
				tileindex = 3; // crossing
				break;
			case 5: //sloped
				if (is_rail_z[4])
					angle = 180;
				if (is_rail_x[4])
					angle = 90;
				if (is_rail_x[5])
					angle = -90;
				break;
			default:
				break;
			}

			TileSpec tile = getNodeTileN(n, p, tileindex, data);
			tile.material_flags &= ~MATERIAL_FLAG_BACKFACE_CULLING;
			tile.material_flags |= MATERIAL_FLAG_CRACK_OVERLAY;

			u16 l = getInteriorLight(n, 0, nodedef);
			video::SColor c = encode_light_and_color(l, tile.color,
				f.light_source);

			float d = (float)BS/64;
			float s = BS/2;

			short g = -1;
			if (is_rail_x[4] || is_rail_x[5] || is_rail_z[4] || is_rail_z[5])
				g = 1; //Object is at a slope

			video::S3DVertex vertices[4] =
			{
					video::S3DVertex(-s,  -s+d, -s, 0, 0, 0, c, 0, 1),
					video::S3DVertex( s,  -s+d, -s, 0, 0, 0, c, 1, 1),
					video::S3DVertex( s, g*s+d,  s, 0, 0, 0, c, 1, 0),
					video::S3DVertex(-s, g*s+d,  s, 0, 0, 0, c, 0, 0),
			};

			for(s32 i=0; i<4; i++)
			{
				if(angle != 0)
					vertices[i].Pos.rotateXZBy(angle);
				if (data->m_smooth_lighting)
					vertices[i].Color = blendLight(frame, vertices[i].Pos, tile.color);
				vertices[i].Pos += intToFloat(p, BS);
			}

			u16 indices[] = {0,1,2,2,3,0};
			collector.append(tile, vertices, 4, indices, 6);
		break;}
		case NDT_NODEBOX:
		{
			static const v3s16 tile_dirs[6] = {
				v3s16(0, 1, 0),
				v3s16(0, -1, 0),
				v3s16(1, 0, 0),
				v3s16(-1, 0, 0),
				v3s16(0, 0, 1),
				v3s16(0, 0, -1)
			};

			TileSpec tiles[6];
			video::SColor colors[6];
			for (int j = 0; j < 6; j++) {
				// Handles facedir rotation for textures
				tiles[j] = getNodeTile(n, p, tile_dirs[j], data);
			}
			if (!data->m_smooth_lighting) {
				u16 l = getInteriorLight(n, 1, nodedef);
				for (int j = 0; j < 6; j++)
					colors[j] = encode_light_and_color(l, tiles[j].color, f.light_source);
			}

			v3f pos = intToFloat(p, BS);

			int neighbors = 0;

			// locate possible neighboring nodes to connect to
			if (f.node_box.type == NODEBOX_CONNECTED) {
				v3s16 p2 = p;

				p2.Y++;
				getNeighborConnectingFace(blockpos_nodes + p2, nodedef, data, n, 1, &neighbors);

				p2 = p;
				p2.Y--;
				getNeighborConnectingFace(blockpos_nodes + p2, nodedef, data, n, 2, &neighbors);

				p2 = p;
				p2.Z--;
				getNeighborConnectingFace(blockpos_nodes + p2, nodedef, data, n, 4, &neighbors);

				p2 = p;
				p2.X--;
				getNeighborConnectingFace(blockpos_nodes + p2, nodedef, data, n, 8, &neighbors);

				p2 = p;
				p2.Z++;
				getNeighborConnectingFace(blockpos_nodes + p2, nodedef, data, n, 16, &neighbors);

				p2 = p;
				p2.X++;
				getNeighborConnectingFace(blockpos_nodes + p2, nodedef, data, n, 32, &neighbors);
			}

			std::vector<aabb3f> boxes;
			n.getNodeBoxes(nodedef, &boxes, neighbors);
			for (std::vector<aabb3f>::iterator
					i = boxes.begin();
					i != boxes.end(); ++i) {
				aabb3f box = *i;

				f32 dx1 = box.MinEdge.X;
				f32 dy1 = box.MinEdge.Y;
				f32 dz1 = box.MinEdge.Z;
				f32 dx2 = box.MaxEdge.X;
				f32 dy2 = box.MaxEdge.Y;
				f32 dz2 = box.MaxEdge.Z;

				box.MinEdge += pos;
				box.MaxEdge += pos;

				if (box.MinEdge.X > box.MaxEdge.X)
					std::swap(box.MinEdge.X, box.MaxEdge.X);
				if (box.MinEdge.Y > box.MaxEdge.Y)
					std::swap(box.MinEdge.Y, box.MaxEdge.Y);
				if (box.MinEdge.Z > box.MaxEdge.Z)
					std::swap(box.MinEdge.Z, box.MaxEdge.Z);

				//
				// Compute texture coords
				f32 tx1 = (box.MinEdge.X/BS)+0.5;
				f32 ty1 = (box.MinEdge.Y/BS)+0.5;
				f32 tz1 = (box.MinEdge.Z/BS)+0.5;
				f32 tx2 = (box.MaxEdge.X/BS)+0.5;
				f32 ty2 = (box.MaxEdge.Y/BS)+0.5;
				f32 tz2 = (box.MaxEdge.Z/BS)+0.5;
				f32 txc[24] = {
					// up
					tx1, 1-tz2, tx2, 1-tz1,
					// down
					tx1, tz1, tx2, tz2,
					// right
					tz1, 1-ty2, tz2, 1-ty1,
					// left
					1-tz2, 1-ty2, 1-tz1, 1-ty1,
					// back
					1-tx2, 1-ty2, 1-tx1, 1-ty1,
					// front
					tx1, 1-ty2, tx2, 1-ty1,
				};
				if (data->m_smooth_lighting) {
					u16 lights[8];
					for (int j = 0; j < 8; ++j) {
						f32 x = (j & 4) ? dx2 : dx1;
						f32 y = (j & 2) ? dy2 : dy1;
						f32 z = (j & 1) ? dz2 : dz1;
						lights[j] = blendLight(frame, core::vector3df(x, y, z));
					}
					makeSmoothLightedCuboid(&collector, box, tiles, 6, lights, txc, f.light_source);
				} else {
					makeCuboid(&collector, box, tiles, 6, colors, txc, f.light_source);
				}
			}
		break;}
		case NDT_MESH:
		{
			v3f pos = intToFloat(p, BS);
			u16 l = getInteriorLight(n, 1, nodedef);
			u8 facedir = 0;
			if (f.param_type_2 == CPT2_FACEDIR ||
					f.param_type_2 == CPT2_COLORED_FACEDIR) {
				facedir = n.getFaceDir(nodedef);
			} else if (f.param_type_2 == CPT2_WALLMOUNTED ||
					f.param_type_2 == CPT2_COLORED_WALLMOUNTED) {
				//convert wallmounted to 6dfacedir.
				//when cache enabled, it is already converted
				facedir = n.getWallMounted(nodedef);
				if (!enable_mesh_cache) {
					static const u8 wm_to_6d[6] = {20, 0, 16+1, 12+3, 8, 4+2};
					facedir = wm_to_6d[facedir];
				}
			}

			if (!data->m_smooth_lighting && f.mesh_ptr[facedir]) {
				// use cached meshes
				for (u16 j = 0; j < f.mesh_ptr[0]->getMeshBufferCount(); j++) {
					const TileSpec &tile = getNodeTileN(n, p, j, data);
					scene::IMeshBuffer *buf = f.mesh_ptr[facedir]->getMeshBuffer(j);
					collector.append(tile, (video::S3DVertex *)
						buf->getVertices(), buf->getVertexCount(),
						buf->getIndices(), buf->getIndexCount(), pos,
						encode_light_and_color(l, tile.color, f.light_source),
						f.light_source);
				}
			} else if (f.mesh_ptr[0]) {
				// no cache, clone and rotate mesh
				scene::IMesh* mesh = cloneMesh(f.mesh_ptr[0]);
				rotateMeshBy6dFacedir(mesh, facedir);
				recalculateBoundingBox(mesh);
				meshmanip->recalculateNormals(mesh, true, false);
				for (u16 j = 0; j < mesh->getMeshBufferCount(); j++) {
					const TileSpec &tile = getNodeTileN(n, p, j, data);
					scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
					video::S3DVertex *vertices = (video::S3DVertex *)buf->getVertices();
					u32 vertex_count = buf->getVertexCount();
					if (data->m_smooth_lighting) {
						for (u16 m = 0; m < vertex_count; ++m) {
							video::S3DVertex &vertex = vertices[m];
							vertex.Color = blendLight(frame, vertex.Pos, vertex.Normal, tile.color);
							vertex.Pos += pos;
						}
						collector.append(tile, vertices, vertex_count,
							buf->getIndices(), buf->getIndexCount());
					} else {
						collector.append(tile, vertices, vertex_count,
							buf->getIndices(), buf->getIndexCount(), pos,
							encode_light_and_color(l, tile.color, f.light_source),
							f.light_source);
					}
				}
				mesh->drop();
			}
		break;}
		}
	}
}