Dynamic sky, fog and cloud colors; sun and moon

src/CMakeLists.txt

@@ -159,6 +159,7 @@ endif()
 # Client sources
 set(minetest_SRCS
 	${common_SRCS}
+	sky.cpp
 	clientmap.cpp
 	content_cso.cpp
 	content_mapblock.cpp

src/camera.cpp

@@ -375,7 +375,11 @@ void Camera::updateViewingRange(f32 frametime_in)
 		m_draw_control.wanted_range = viewing_range_max;
 
 	// Just so big a value that everything rendered is visible
-	// Some more allowance than viewing_range_max * BS because of active objects etc.
+	// Some more allowance than viewing_range_max * BS because of clouds,
+	// active objects, etc.
+	if(viewing_range_max < 200*BS)
+		m_cameranode->setFarValue(200 * BS * 10);
+	else
 		m_cameranode->setFarValue(viewing_range_max * BS * 10);
 
 	f32 wanted_fps = g_settings->getFloat("wanted_fps");

src/client.cpp

@@ -247,14 +247,16 @@ Client::Client(
 	m_animation_time(0),
 	m_crack_level(-1),
 	m_crack_pos(0,0,0),
-	m_time_of_day(0),
 	m_map_seed(0),
 	m_password(password),
 	m_access_denied(false),
 	m_texture_receive_progress(0),
 	m_textures_received(false),
 	m_itemdef_received(false),
-	m_nodedef_received(false)
+	m_nodedef_received(false),
+	m_time_of_day_set(false),
+	m_last_time_of_day_f(-1),
+	m_time_of_day_update_timer(0)
 {
 	m_packetcounter_timer = 0.0;
 	//m_delete_unused_sectors_timer = 0.0;
@@ -333,6 +335,8 @@ void Client::step(float dtime)
 	if(m_animation_time > 60.0)
 		m_animation_time -= 60.0;
 
+	m_time_of_day_update_timer += dtime;
+	
 	//infostream<<"Client steps "<<dtime<<std::endl;
 
 	{
@@ -1044,22 +1048,37 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 		u16 time_of_day = readU16(&data[2]);
 		time_of_day = time_of_day % 24000;
 		//infostream<<"Client: time_of_day="<<time_of_day<<std::endl;
-		
-		/*
-			time_of_day:
-			0 = midnight
-			12000 = midday
-		*/
-		{
-			m_env.setTimeOfDay(time_of_day);
-
-			u32 dr = m_env.getDayNightRatio();
-
-			infostream<<"Client: time_of_day="<<time_of_day
-					<<", dr="<<dr
-					<<std::endl;
+		float time_speed = 0;
+		if(datasize >= 2 + 2 + 4){
+			time_speed = readF1000(&data[4]);
+		} else {
+			// Old message; try to approximate speed of time by ourselves
+			float time_of_day_f = (float)time_of_day / 24000.0;
+			float tod_diff_f = 0;
+			if(time_of_day_f < 0.2 && m_last_time_of_day_f > 0.8)
+				tod_diff_f = time_of_day_f - m_last_time_of_day_f + 1.0;
+			else
+				tod_diff_f = time_of_day_f - m_last_time_of_day_f;
+			m_last_time_of_day_f = time_of_day_f;
+			float time_diff = m_time_of_day_update_timer;
+			m_time_of_day_update_timer = 0;
+			if(m_time_of_day_set){
+				time_speed = 3600.0*24.0 * tod_diff_f / time_diff;
+				infostream<<"Client: Measured time_of_day speed (old format): "
+						<<time_speed<<" tod_diff_f="<<tod_diff_f
+						<<" time_diff="<<time_diff<<std::endl;
+			}
 		}
 		
+		// Update environment
+		m_env.setTimeOfDay(time_of_day);
+		m_env.setTimeOfDaySpeed(time_speed);
+		m_time_of_day_set = true;
+
+		u32 dr = m_env.getDayNightRatio();
+		verbosestream<<"Client: time_of_day="<<time_of_day
+				<<" time_speed="<<time_speed
+				<<" dr="<<dr<<std::endl;
 	}
 	else if(command == TOCLIENT_CHAT_MESSAGE)
 	{
@@ -2075,12 +2094,6 @@ void Client::setCrack(int level, v3s16 pos)
 	}
 }
 
-u32 Client::getDayNightRatio()
-{
-	//JMutexAutoLock envlock(m_env_mutex); //bulk comment-out
-	return m_env.getDayNightRatio();
-}
-
 u16 Client::getHP()
 {
 	Player *player = m_env.getLocalPlayer();

src/client.h

@@ -256,8 +256,6 @@ public:
 	int getCrackLevel();
 	void setCrack(int level, v3s16 pos);
 
-	u32 getDayNightRatio();
-
 	u16 getHP();
 
 	float getAvgRtt()
@@ -350,8 +348,6 @@ private:
 	float m_animation_time;
 	int m_crack_level;
 	v3s16 m_crack_pos;
-	// Received from the server. 0-23999
-	u32 m_time_of_day;
 	// 0 <= m_daynight_i < DAYNIGHT_CACHE_COUNT
 	//s32 m_daynight_i;
 	//u32 m_daynight_ratio;
@@ -367,6 +363,11 @@ private:
 	bool m_itemdef_received;
 	bool m_nodedef_received;
 	friend class FarMesh;
+
+	// time_of_day speed approximation for old protocol
+	bool m_time_of_day_set;
+	float m_last_time_of_day_f;
+	float m_time_of_day_update_timer;
 };
 
 #endif // !SERVER

src/clientmap.cpp

@@ -21,6 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "client.h"
 #include "mapblock_mesh.h"
 #include <IMaterialRenderer.h>
+#include <matrix4.h>
 #include "log.h"
 #include "mapsector.h"
 #include "main.h" // dout_client, g_settings
@@ -29,6 +30,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "profiler.h"
 #include "settings.h"
 
+#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
+
 ClientMap::ClientMap(
 		Client *client,
 		IGameDef *gamedef,
@@ -189,7 +192,7 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 	*/
 	float animation_time = m_client->getAnimationTime();
 	int crack = m_client->getCrackLevel();
-	u32 daynight_ratio = m_client->getDayNightRatio();
+	u32 daynight_ratio = m_client->getEnv().getDayNightRatio();
 
 	m_camera_mutex.Lock();
 	v3f camera_position = m_camera_position;
@@ -509,6 +512,182 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 			<<", rendered "<<vertex_count<<" vertices."<<std::endl;*/
 }
 
+static bool getVisibleBrightness(Map *map, v3f p0, v3f dir, float step,
+		float step_multiplier, float start_distance, float end_distance,
+		INodeDefManager *ndef, u32 daylight_factor, float sunlight_min_d,
+		int *result, bool *sunlight_seen)
+{
+	int brightness_sum = 0;
+	int brightness_count = 0;
+	float distance = start_distance;
+	dir.normalize();
+	v3f pf = p0;
+	pf += dir * distance;
+	int noncount = 0;
+	bool nonlight_seen = false;
+	bool allow_allowing_non_sunlight_propagates = false;
+	bool allow_non_sunlight_propagates = false;
+	// Check content nearly at camera position
+	{
+		v3s16 p = floatToInt(p0 /*+ dir * 3*BS*/, BS);
+		MapNode n = map->getNodeNoEx(p);
+		if(ndef->get(n).param_type == CPT_LIGHT &&
+				!ndef->get(n).sunlight_propagates)
+			allow_allowing_non_sunlight_propagates = true;
+	}
+	// If would start at CONTENT_IGNORE, start closer
+	{
+		v3s16 p = floatToInt(pf, BS);
+		MapNode n = map->getNodeNoEx(p);
+		if(n.getContent() == CONTENT_IGNORE){
+			float newd = 2*BS;
+			pf = p0 + dir * 2*newd;
+			distance = newd;
+		}
+	}
+	for(int i=0; distance < end_distance; i++){
+		pf += dir * step;
+		distance += step;
+		step *= step_multiplier;
+		
+		v3s16 p = floatToInt(pf, BS);
+		MapNode n = map->getNodeNoEx(p);
+		if(allow_allowing_non_sunlight_propagates && i == 0 &&
+				ndef->get(n).param_type == CPT_LIGHT &&
+				!ndef->get(n).sunlight_propagates){
+			allow_non_sunlight_propagates = true;
+		}
+		if(ndef->get(n).param_type != CPT_LIGHT ||
+				(!ndef->get(n).sunlight_propagates &&
+					!allow_non_sunlight_propagates)){
+			nonlight_seen = true;
+			noncount++;
+			if(noncount >= 4)
+				break;
+			continue;
+		}
+		if(distance >= sunlight_min_d && *sunlight_seen == false
+				&& nonlight_seen == false)
+			if(n.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
+				*sunlight_seen = true;
+		noncount = 0;
+		brightness_sum += decode_light(n.getLightBlend(daylight_factor, ndef));
+		brightness_count++;
+	}
+	*result = 0;
+	if(brightness_count == 0)
+		return false;
+	*result = brightness_sum / brightness_count;
+	/*std::cerr<<"Sampled "<<brightness_count<<" points; result="
+			<<(*result)<<std::endl;*/
+	return true;
+}
+
+int ClientMap::getBackgroundBrightness(float max_d, u32 daylight_factor,
+		int oldvalue, bool *sunlight_seen_result)
+{
+	const bool debugprint = false;
+	INodeDefManager *ndef = m_gamedef->ndef();
+	static v3f z_directions[50] = {
+		v3f(-100, 0, 0)
+	};
+	static f32 z_offsets[sizeof(z_directions)/sizeof(*z_directions)] = {
+		-1000,
+	};
+	if(z_directions[0].X < -99){
+		for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
+			z_directions[i] = v3f(
+				0.01 * myrand_range(-80, 80),
+				1.0,
+				0.01 * myrand_range(-80, 80)
+			);
+			z_offsets[i] = 0.01 * myrand_range(0,100);
+		}
+	}
+	if(debugprint)
+		std::cerr<<"In goes "<<PP(m_camera_direction)<<", out comes ";
+	int sunlight_seen_count = 0;
+	float sunlight_min_d = max_d*0.8;
+	if(sunlight_min_d > 35*BS)
+		sunlight_min_d = 35*BS;
+	core::array<int> values;
+	for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
+		v3f z_dir = z_directions[i];
+		z_dir.normalize();
+		core::CMatrix4<f32> a;
+		a.buildRotateFromTo(v3f(0,1,0), z_dir);
+		v3f dir = m_camera_direction;
+		a.rotateVect(dir);
+		int br = 0;
+		float step = BS*1.5;
+		if(max_d > 35*BS)
+			step = max_d / 35 * 1.5;
+		float off = step * z_offsets[i];
+		bool sunlight_seen_now = false;
+		bool ok = getVisibleBrightness(this, m_camera_position, dir,
+				step, 1.0, max_d*0.6+off, max_d, ndef, daylight_factor,
+				sunlight_min_d,
+				&br, &sunlight_seen_now);
+		if(sunlight_seen_now)
+			sunlight_seen_count++;
+		if(!ok)
+			continue;
+		values.push_back(br);
+		// Don't try too much if being in the sun is clear
+		if(sunlight_seen_count >= 20)
+			break;
+	}
+	int brightness_sum = 0;
+	int brightness_count = 0;
+	values.sort();
+	u32 num_values_to_use = values.size();
+	if(num_values_to_use >= 10)
+		num_values_to_use -= num_values_to_use/2;
+	else if(num_values_to_use >= 7)
+		num_values_to_use -= num_values_to_use/3;
+	u32 first_value_i = (values.size() - num_values_to_use) / 2;
+	if(debugprint){
+		for(u32 i=0; i < first_value_i; i++)
+			std::cerr<<values[i]<<" ";
+		std::cerr<<"[";
+	}
+	for(u32 i=first_value_i; i < first_value_i+num_values_to_use; i++){
+		if(debugprint)
+			std::cerr<<values[i]<<" ";
+		brightness_sum += values[i];
+		brightness_count++;
+	}
+	if(debugprint){
+		std::cerr<<"]";
+		for(u32 i=first_value_i+num_values_to_use; i < values.size(); i++)
+			std::cerr<<values[i]<<" ";
+	}
+	int ret = 0;
+	if(brightness_count == 0){
+		MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));
+		if(ndef->get(n).param_type == CPT_LIGHT){
+			ret = decode_light(n.getLightBlend(daylight_factor, ndef));
+		} else {
+			ret = oldvalue;
+			//ret = blend_light(255, 0, daylight_factor);
+		}
+	} else {
+		/*float pre = (float)brightness_sum / (float)brightness_count;
+		float tmp = pre;
+		const float d = 0.2;
+		pre *= 1.0 + d*2;
+		pre -= tmp * d;
+		int preint = pre;
+		ret = MYMAX(0, MYMIN(255, preint));*/
+		ret = brightness_sum / brightness_count;
+	}
+	if(debugprint)
+		std::cerr<<"Result: "<<ret<<" sunlight_seen_count="
+				<<sunlight_seen_count<<std::endl;
+	*sunlight_seen_result = (sunlight_seen_count > 0);
+	return ret;
+}
+
 void ClientMap::renderPostFx()
 {
 	INodeDefManager *nodemgr = m_gamedef->ndef();

src/clientmap.h

@@ -116,6 +116,9 @@ public:
 
 	void renderMap(video::IVideoDriver* driver, s32 pass);
 
+	int getBackgroundBrightness(float max_d, u32 daylight_factor,
+			int oldvalue, bool *sunlight_seen_result);
+
 	void renderPostFx();
 
 	// For debug printing

src/clientserver.h

@@ -135,6 +135,8 @@ enum ToClientCommand
 	/*
 		u16 command
 		u16 time (0-23999)
+		Added in a later version:
+		f1000 time_speed
 	*/
 
 	// (oops, there is some gap here)
@@ -453,11 +455,12 @@ enum ToServerCommand
 
 };
 
-inline SharedBuffer<u8> makePacket_TOCLIENT_TIME_OF_DAY(u16 time)
+inline SharedBuffer<u8> makePacket_TOCLIENT_TIME_OF_DAY(u16 time, float time_speed)
 {
-	SharedBuffer<u8> data(2+2);
+	SharedBuffer<u8> data(2+2+4);
 	writeU16(&data[0], TOCLIENT_TIME_OF_DAY);
 	writeU16(&data[2], time);
+	writeF1000(&data[4], time_speed);
 	return data;
 }
 

src/clouds.cpp

@@ -29,24 +29,27 @@ Clouds::Clouds(
 		scene::ISceneNode* parent,
 		scene::ISceneManager* mgr,
 		s32 id,
-		float cloud_y,
 		u32 seed
 ):
 	scene::ISceneNode(parent, mgr, id),
-	m_cloud_y(cloud_y),
 	m_seed(seed),
 	m_camera_pos(0,0),
 	m_time(0)
 {
 	m_material.setFlag(video::EMF_LIGHTING, false);
-	m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
+	//m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
+	m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
 	m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
-	m_material.setFlag(video::EMF_FOG_ENABLE, false);
-	//m_material.setFlag(video::EMF_ANTI_ALIASING, true);
+	m_material.setFlag(video::EMF_FOG_ENABLE, true);
+	m_material.setFlag(video::EMF_ANTI_ALIASING, true);
 	//m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
+	m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 
-	m_box = core::aabbox3d<f32>(-BS*1000000,cloud_y-BS,-BS*1000000,
-			BS*1000000,cloud_y+BS,BS*1000000);
+	m_cloud_y = BS*100;
+	//m_cloud_y = BS*50;
+
+	m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
+			BS*1000000,m_cloud_y+BS,BS*1000000);
 
 }
 
@@ -58,8 +61,8 @@ void Clouds::OnRegisterSceneNode()
 {
 	if(IsVisible)
 	{
-		//SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
-		SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
+		SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
+		//SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
 	}
 
 	ISceneNode::OnRegisterSceneNode();
@@ -71,16 +74,16 @@ void Clouds::render()
 {
 	video::IVideoDriver* driver = SceneManager->getVideoDriver();
 
-	/*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
-		return;*/
-	if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
+	if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
+	//if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
 		return;
 
 	ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
 	
-	int num_faces_to_draw = 1;
-	if(g_settings->getBool("enable_3d_clouds"))
-		num_faces_to_draw = 6;
+	bool enable_3d = g_settings->getBool("enable_3d_clouds");
+	int num_faces_to_draw = enable_3d ? 6 : 1;
+	
+	m_material.setFlag(video::EMF_BACK_FACE_CULLING, enable_3d);
 
 	driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
 	driver->setMaterial(m_material);
@@ -90,8 +93,10 @@ void Clouds::render()
 	*/
 
 	const s16 cloud_radius_i = 12;
-	const float cloud_size = BS*48;
-	const v2f cloud_speed(-BS*2, 0);
+	const float cloud_size = BS*64;
+	const v2f cloud_speed(0, -BS*2);
+	
+	const float cloud_full_radius = cloud_size * cloud_radius_i;
 	
 	// Position of cloud noise origin in world coordinates
 	v2f world_cloud_origin_pos_f = m_time*cloud_speed;
@@ -110,33 +115,103 @@ void Clouds::render()
 		center_of_drawing_in_noise_i.Y * cloud_size
 	) + world_cloud_origin_pos_f;
 
+	/*video::SColor c_top(128,b*240,b*240,b*255);
+	video::SColor c_side_1(128,b*230,b*230,b*255);
+	video::SColor c_side_2(128,b*220,b*220,b*245);
+	video::SColor c_bottom(128,b*205,b*205,b*230);*/
+	video::SColorf c_top_f(m_color);
+	video::SColorf c_side_1_f(m_color);
+	video::SColorf c_side_2_f(m_color);
+	video::SColorf c_bottom_f(m_color);
+	c_side_1_f.r *= 0.95;
+	c_side_1_f.g *= 0.95;
+	c_side_1_f.b *= 0.95;
+	c_side_2_f.r *= 0.90;
+	c_side_2_f.g *= 0.90;
+	c_side_2_f.b *= 0.90;
+	c_bottom_f.r *= 0.80;
+	c_bottom_f.g *= 0.80;
+	c_bottom_f.b *= 0.80;
+	c_top_f.a = 0.9;
+	c_side_1_f.a = 0.9;
+	c_side_2_f.a = 0.9;
+	c_bottom_f.a = 0.9;
+	video::SColor c_top = c_top_f.toSColor();
+	video::SColor c_side_1 = c_side_1_f.toSColor();
+	video::SColor c_side_2 = c_side_2_f.toSColor();
+	video::SColor c_bottom = c_bottom_f.toSColor();
+
+	// Get fog parameters for setting them back later
+	video::SColor fog_color(0,0,0,0);
+	video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
+	f32 fog_start = 0;
+	f32 fog_end = 0;
+	f32 fog_density = 0;
+	bool fog_pixelfog = false;
+	bool fog_rangefog = false;
+	driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
+			fog_pixelfog, fog_rangefog);
+	
+	// Set our own fog
+	driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
+			cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
+
+	// Read noise
+
+	bool *grid = new bool[cloud_radius_i*2*cloud_radius_i*2];
+
 	for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 	for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 	{
+		u32 i = (zi+cloud_radius_i)*cloud_radius_i*2 + xi+cloud_radius_i;
+
 		v2s16 p_in_noise_i(
 			xi+center_of_drawing_in_noise_i.X,
 			zi+center_of_drawing_in_noise_i.Y
 		);
 
-		/*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
-			continue;*/
-		/*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
-			continue;*/
-
-		v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
-		
+#if 0
 		double noise = noise2d_perlin_abs(
 				(float)p_in_noise_i.X*cloud_size/BS/200,
 				(float)p_in_noise_i.Y*cloud_size/BS/200,
 				m_seed, 3, 0.4);
-		if(noise < 0.95)
+		grid[i] = (noise >= 0.80);
+#endif
+#if 1
+		double noise = noise2d_perlin(
+				(float)p_in_noise_i.X*cloud_size/BS/200,
+				(float)p_in_noise_i.Y*cloud_size/BS/200,
+				m_seed, 3, 0.5);
+		grid[i] = (noise >= 0.4);
+#endif
+	}
+
+#define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
+#define CONTAINS(x, z, radius) \
+	((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
+
+	for(s16 zi0=-cloud_radius_i; zi0<cloud_radius_i; zi0++)
+	for(s16 xi0=-cloud_radius_i; xi0<cloud_radius_i; xi0++)
+	{
+		s16 zi = zi0;
+		s16 xi = xi0;
+		// Draw from front to back (needed for transparency)
+		/*if(zi <= 0)
+			zi = -cloud_radius_i - zi;
+		if(xi <= 0)
+			xi = -cloud_radius_i - xi;*/
+		// Draw from back to front
+		if(zi >= 0)
+			zi = cloud_radius_i - zi - 1;
+		if(xi >= 0)
+			xi = cloud_radius_i - xi - 1;
+
+		u32 i = GETINDEX(xi, zi, cloud_radius_i);
+
+		if(grid[i] == false)
 			continue;
 
-		float b = m_brightness;
-		video::SColor c_top(128,b*240,b*240,b*255);
-		video::SColor c_side_1(128,b*230,b*230,b*255);
-		video::SColor c_side_2(128,b*220,b*220,b*245);
-		video::SColor c_bottom(128,b*205,b*205,b*230);
+		v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 
 		video::S3DVertex v[4] =
 		{
@@ -146,55 +221,95 @@ void Clouds::render()
 			video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 		};
 
-		f32 rx = cloud_size;
+		/*if(zi <= 0 && xi <= 0){
+			v[0].Color.setBlue(255);
+			v[1].Color.setBlue(255);
+			v[2].Color.setBlue(255);
+			v[3].Color.setBlue(255);
+		}*/
+
+		f32 rx = cloud_size/2;
 		f32 ry = 8*BS;
-		f32 rz = cloud_size;
+		f32 rz = cloud_size/2;
 
 		for(int i=0; i<num_faces_to_draw; i++)
 		{
 			switch(i)
 			{
 				case 0:	// top
+					for(int j=0;j<4;j++){
+						v[j].Normal = v3f(0,1,0);
+					}
 					v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 					v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 					v[2].Pos.X= rx; v[2].Pos.Y= ry; v[2].Pos.Z= rz;
 					v[3].Pos.X= rx; v[3].Pos.Y= ry, v[3].Pos.Z=-rz;
 					break;
 				case 1: // back
-					for(int j=0;j<4;j++)
+					if(CONTAINS(xi, zi-1, cloud_radius_i)){
+						u32 j = GETINDEX(xi, zi-1, cloud_radius_i);
+						if(grid[j])
+							continue;
+					}
+					for(int j=0;j<4;j++){
 						v[j].Color=c_side_1;
+						v[j].Normal = v3f(0,0,-1);
+					}
 					v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 					v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 					v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 					v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 					break;
 				case 2: //right
-					for(int j=0;j<4;j++)
+					if(CONTAINS(xi+1, zi, cloud_radius_i)){
+						u32 j = GETINDEX(xi+1, zi, cloud_radius_i);
+						if(grid[j])
+							continue;
+					}
+					for(int j=0;j<4;j++){
 						v[j].Color=c_side_2;
+						v[j].Normal = v3f(1,0,0);
+					}
 					v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 					v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 					v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 					v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 					break;
 				case 3: // front
-					for(int j=0;j<4;j++)
+					if(CONTAINS(xi, zi+1, cloud_radius_i)){
+						u32 j = GETINDEX(xi, zi+1, cloud_radius_i);
+						if(grid[j])
+							continue;
+					}
+					for(int j=0;j<4;j++){
 						v[j].Color=c_side_1;
+						v[j].Normal = v3f(0,0,-1);
+					}
 					v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 					v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 					v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 					v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 					break;
 				case 4: // left
-					for(int j=0;j<4;j++)
+					if(CONTAINS(xi-1, zi, cloud_radius_i)){
+						u32 j = GETINDEX(xi-1, zi, cloud_radius_i);
+						if(grid[j])
+							continue;
+					}
+					for(int j=0;j<4;j++){
 						v[j].Color=c_side_2;
+						v[j].Normal = v3f(-1,0,0);
+					}
 					v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 					v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 					v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 					v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 					break;
 				case 5: // bottom
-					for(int j=0;j<4;j++)
+					for(int j=0;j<4;j++){
 						v[j].Color=c_bottom;
+						v[j].Normal = v3f(0,-1,0);
+					}
 					v[0].Pos.X= rx; v[0].Pos.Y=-ry; v[0].Pos.Z= rz;
 					v[1].Pos.X=-rx; v[1].Pos.Y=-ry; v[1].Pos.Z= rz;
 					v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
@@ -210,8 +325,13 @@ void Clouds::render()
 			driver->drawVertexPrimitiveList(v, 4, indices, 2,
 					video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 		}
-
 	}
+
+	delete[] grid;
+	
+	// Restore fog settings
+	driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
+			fog_pixelfog, fog_rangefog);
 }
 
 void Clouds::step(float dtime)
@@ -219,9 +339,11 @@ void Clouds::step(float dtime)
 	m_time += dtime;
 }
 
-void Clouds::update(v2f camera_p, float brightness)
+void Clouds::update(v2f camera_p, video::SColorf color)
 {
 	m_camera_pos = camera_p;
-	m_brightness = brightness;
+	m_color = color;
+	//m_brightness = brightness;
+	//dstream<<"m_brightness="<<m_brightness<<std::endl;
 }
 

src/clouds.h

@@ -30,7 +30,6 @@ public:
 			scene::ISceneNode* parent,
 			scene::ISceneManager* mgr,
 			s32 id,
-			float cloud_y,
 			u32 seed
 	);
 
@@ -65,13 +64,14 @@ public:
 
 	void step(float dtime);
 
-	void update(v2f camera_p, float brightness);
+	void update(v2f camera_p, video::SColorf color);
 
 private:
 	video::SMaterial m_material;
 	core::aabbox3d<f32> m_box;
 	float m_cloud_y;
 	float m_brightness;
+	video::SColorf m_color;
 	u32 m_seed;
 	v2f m_camera_pos;
 	float m_time;

src/daynightratio.h

@@ -0,0 +1,43 @@
+/*
+Minetest-c55
+Copyright (C) 2010-2012 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 General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU 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.
+*/
+
+#ifndef DAYNIGHTRATIO_HEADER
+#define DAYNIGHTRATIO_HEADER
+
+inline u32 time_to_daynight_ratio(u32 time_of_day)
+{
+	s32 t = time_of_day%24000;
+	if(t < 4500 || t >= 19500)
+		return 150;
+	else if(t < 4750 || t >= 19250)
+		return 250;
+	else if(t < 5000 || t >= 19000)
+		return 350;
+	else if(t < 5250 || t >= 18750)
+		return 500;
+	else if(t < 5500 || t >= 18500)
+		return 675;
+	else if(t < 5750 || t >= 18250)
+		return 875;
+	else
+		return 1000;
+}
+
+#endif
+

src/defaultsettings.cpp

@@ -71,7 +71,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("fps_max", "60");
 	// A bit more than the server will send around the player, to make fog blend well
 	settings->setDefault("viewing_range_nodes_min", "35");
-	settings->setDefault("viewing_range_nodes_max", "128");
+	settings->setDefault("viewing_range_nodes_max", "160");
 	settings->setDefault("screenW", "800");
 	settings->setDefault("screenH", "600");
 	settings->setDefault("address", "");
@@ -121,11 +121,11 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("active_block_range", "2");
 	//settings->setDefault("max_simultaneous_block_sends_per_client", "1");
 	// This causes frametime jitter on client side, or does it?
-	settings->setDefault("max_simultaneous_block_sends_per_client", "2");
-	settings->setDefault("max_simultaneous_block_sends_server_total", "8");
-	settings->setDefault("max_block_send_distance", "7");
-	settings->setDefault("max_block_generate_distance", "5");
-	settings->setDefault("time_send_interval", "20");
+	settings->setDefault("max_simultaneous_block_sends_per_client", "4");
+	settings->setDefault("max_simultaneous_block_sends_server_total", "20");
+	settings->setDefault("max_block_send_distance", "10");
+	settings->setDefault("max_block_generate_distance", "6");
+	settings->setDefault("time_send_interval", "5");
 	settings->setDefault("time_speed", "96");
 	settings->setDefault("server_unload_unused_data_timeout", "29");
 	settings->setDefault("server_map_save_interval", "5.3");

src/environment.cpp

@@ -41,11 +41,15 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef SERVER
 #include "clientmap.h"
 #endif
+#include "daynightratio.h"
 
 #define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
 
 Environment::Environment():
-	m_time_of_day(9000)
+	m_time_of_day(9000),
+	m_time_of_day_f(9000./24000),
+	m_time_of_day_speed(0),
+	m_time_counter(0)
 {
 }
 
@@ -195,17 +199,35 @@ void Environment::printPlayers(std::ostream &o)
 	}
 }
 
-/*void Environment::setDayNightRatio(u32 r)
-{
-	getDayNightRatio() = r;
-}*/
-
 u32 Environment::getDayNightRatio()
 {
-	//return getDayNightRatio();
 	return time_to_daynight_ratio(m_time_of_day);
 }
 
+void Environment::stepTimeOfDay(float dtime)
+{
+	m_time_counter += dtime;
+	f32 speed = m_time_of_day_speed * 24000./(24.*3600);
+	u32 units = (u32)(m_time_counter*speed);
+	m_time_counter -= (f32)units / speed;
+	bool sync_f = false;
+	if(units > 0){
+		// Sync at overflow
+		if(m_time_of_day + units >= 24000)
+			sync_f = true;
+		m_time_of_day = (m_time_of_day + units) % 24000;
+		if(sync_f)
+			m_time_of_day_f = (float)m_time_of_day / 24000.0;
+	}
+	if(!sync_f){
+		m_time_of_day_f += m_time_of_day_speed/24/3600*dtime;
+		if(m_time_of_day_f > 1.0)
+			m_time_of_day_f -= 1.0;
+		if(m_time_of_day_f < 0.0)
+			m_time_of_day_f += 1.0;
+	}
+}
+
 /*
 	ABMWithState
 */
@@ -893,6 +915,9 @@ void ServerEnvironment::step(float dtime)
 	
 	//TimeTaker timer("ServerEnv step");
 
+	/* Step time of day */
+	stepTimeOfDay(dtime);
+
 	/*
 		Increment game time
 	*/
@@ -1861,6 +1886,9 @@ void ClientEnvironment::step(float dtime)
 {
 	DSTACK(__FUNCTION_NAME);
 
+	/* Step time of day */
+	stepTimeOfDay(dtime);
+
 	// Get some settings
 	bool free_move = g_settings->getBool("free_move");
 

src/environment.h

@@ -74,27 +74,39 @@ public:
 	core::list<Player*> getPlayers(bool ignore_disconnected);
 	void printPlayers(std::ostream &o);
 	
-	//void setDayNightRatio(u32 r);
 	u32 getDayNightRatio();
 	
 	// 0-23999
 	virtual void setTimeOfDay(u32 time)
 	{
 		m_time_of_day = time;
+		m_time_of_day_f = (float)time / 24000.0;
 	}
 
 	u32 getTimeOfDay()
-	{
-		return m_time_of_day;
-	}
+	{ return m_time_of_day; }
+
+	float getTimeOfDayF()
+	{ return m_time_of_day_f; }
+
+	void stepTimeOfDay(float dtime);
+
+	void setTimeOfDaySpeed(float speed)
+	{ m_time_of_day_speed = speed; }
+	
+	float getTimeOfDaySpeed()
+	{ return m_time_of_day_speed; }
 
 protected:
 	// peer_ids in here should be unique, except that there may be many 0s
 	core::list<Player*> m_players;
-	// Brightness
-	//u32 m_daynight_ratio;
 	// Time of day in milli-hours (0-23999); determines day and night
 	u32 m_time_of_day;
+	// Time of day in 0...1
+	float m_time_of_day_f;
+	float m_time_of_day_speed;
+	// Used to buffer dtime for adding to m_time_of_day
+	float m_time_counter;
 };
 
 /*

src/game.cpp

@@ -54,6 +54,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "subgame.h"
 #include "quicktune_shortcutter.h"
 #include "clientmap.h"
+#include "sky.h"
 
 /*
 	Setting this to 1 enables a special camera mode that forces
@@ -543,51 +544,6 @@ PointedThing getPointedThing(Client *client, v3f player_position,
 	return result;
 }
 
-void update_skybox(video::IVideoDriver* driver, ITextureSource *tsrc,
-		scene::ISceneManager* smgr, scene::ISceneNode* &skybox,
-		float brightness)
-{
-	if(skybox)
-	{
-		skybox->remove();
-	}
-	
-	/*// Disable skybox if FarMesh is enabled
-	if(g_settings->getBool("enable_farmesh"))
-		return;*/
-	
-	if(brightness >= 0.7)
-	{
-		skybox = smgr->addSkyBoxSceneNode(
-			tsrc->getTextureRaw("skybox2.png"),
-			tsrc->getTextureRaw("skybox3.png"),
-			tsrc->getTextureRaw("skybox1.png"),
-			tsrc->getTextureRaw("skybox1.png"),
-			tsrc->getTextureRaw("skybox1.png"),
-			tsrc->getTextureRaw("skybox1.png"));
-	}
-	else if(brightness >= 0.2)
-	{
-		skybox = smgr->addSkyBoxSceneNode(
-			tsrc->getTextureRaw("skybox2_dawn.png"),
-			tsrc->getTextureRaw("skybox3_dawn.png"),
-			tsrc->getTextureRaw("skybox1_dawn.png"),
-			tsrc->getTextureRaw("skybox1_dawn.png"),
-			tsrc->getTextureRaw("skybox1_dawn.png"),
-			tsrc->getTextureRaw("skybox1_dawn.png"));
-	}
-	else
-	{
-		skybox = smgr->addSkyBoxSceneNode(
-			tsrc->getTextureRaw("skybox2_night.png"),
-			tsrc->getTextureRaw("skybox3_night.png"),
-			tsrc->getTextureRaw("skybox1_night.png"),
-			tsrc->getTextureRaw("skybox1_night.png"),
-			tsrc->getTextureRaw("skybox1_night.png"),
-			tsrc->getTextureRaw("skybox1_night.png"));
-	}
-}
-
 /*
 	Draws a screen with a single text on it.
 	Text will be removed when the screen is drawn the next time.
@@ -679,10 +635,6 @@ void the_game(
 	//const s32 hotbar_imagesize = 64;
 	s32 hotbar_imagesize = 48;
 	
-	// The color of the sky
-	//video::SColor skycolor = video::SColor(255,140,186,250);
-	video::SColor bgcolor_bright = video::SColor(255,170,200,230);
-
 	/*
 		Draw "Loading" screen
 	*/
@@ -891,13 +843,6 @@ void the_game(
 	*/
 	client.afterContentReceived();
 
-	/*
-		Create skybox
-	*/
-	float old_brightness = 1.0;
-	scene::ISceneNode* skybox = NULL;
-	update_skybox(driver, tsrc, smgr, skybox, 1.0);
-	
 	/*
 		Create the camera node
 	*/
@@ -912,14 +857,19 @@ void the_game(
 		Clouds
 	*/
 	
-	float cloud_height = BS*100;
 	Clouds *clouds = NULL;
 	if(g_settings->getBool("enable_clouds"))
 	{
-		clouds = new Clouds(smgr->getRootSceneNode(), smgr, -1,
-				cloud_height, time(0));
+		clouds = new Clouds(smgr->getRootSceneNode(), smgr, -1, time(0));
 	}
 
+	/*
+		Skybox thingy
+	*/
+
+	Sky *sky = NULL;
+	sky = new Sky(smgr->getRootSceneNode(), smgr, -1);
+	
 	/*
 		FarMesh
 	*/
@@ -1022,7 +972,7 @@ void the_game(
 	// A test
 	//throw con::PeerNotFoundException("lol");
 
-	float brightness = 1.0;
+	float recent_turn_speed = 0.0;
 
 	core::list<float> frametime_log;
 
@@ -1054,6 +1004,9 @@ void the_game(
 	u32 show_profiler = 0;
 	u32 show_profiler_max = 3;  // Number of pages
 
+	float time_of_day = 0;
+	float time_of_day_smooth = 0;
+
 	/*
 		Main loop
 	*/
@@ -1639,6 +1592,7 @@ void the_game(
 			NOTE: Do this before client.setPlayerControl() to not cause a camera lag of one frame
 		*/
 		
+		float turn_amount = 0;
 		if((device->isWindowActive() && noMenuActive()) || random_input)
 		{
 			if(!random_input)
@@ -1669,10 +1623,13 @@ void the_game(
 				if(input->isKeyDown(irr::KEY_RIGHT))
 					dx += dtime * keyspeed;*/
 				
-				camera_yaw -= dx*0.2;
-				camera_pitch += dy*0.2;
+				float d = 0.2;
+				camera_yaw -= dx*d;
+				camera_pitch += dy*d;
 				if(camera_pitch < -89.5) camera_pitch = -89.5;
 				if(camera_pitch > 89.5) camera_pitch = 89.5;
+				
+				turn_amount = v2f(dx, dy).getLength() * d;
 			}
 			input->setMousePos(displaycenter.X, displaycenter.Y);
 		}
@@ -1684,6 +1641,8 @@ void the_game(
 			//infostream<<"window inactive"<<std::endl;
 			first_loop_after_window_activation = true;
 		}
+		recent_turn_speed = recent_turn_speed * 0.9 + turn_amount * 0.1;
+		//std::cerr<<"recent_turn_speed = "<<recent_turn_speed<<std::endl;
 
 		/*
 			Player speed control
@@ -1786,8 +1745,6 @@ void the_game(
 				}
 				else if(event.type == CE_TEXTURES_UPDATED)
 				{
-					update_skybox(driver, tsrc, smgr, skybox, brightness);
-					
 					update_wielded_item_trigger = true;
 				}
 			}
@@ -2157,39 +2114,75 @@ void the_game(
 		*/
 
 		/*
-			Calculate general brightness
+			Fog range
 		*/
-		u32 daynight_ratio = client.getDayNightRatio();
-		u8 light8 = decode_light((daynight_ratio * LIGHT_SUN) / 1000);
-		brightness = (float)light8/255.0;
-		video::SColor bgcolor;
-		if(brightness >= 0.2 && brightness < 0.7)
-			bgcolor = video::SColor(
-					255,
-					bgcolor_bright.getRed() * brightness,
-					bgcolor_bright.getGreen() * brightness*0.7,
-					bgcolor_bright.getBlue() * brightness*0.5);
+	
+		f32 fog_range;
+		if(farmesh)
+		{
+			fog_range = BS*farmesh_range;
+		}
 		else
-			bgcolor = video::SColor(
-					255,
-					bgcolor_bright.getRed() * brightness,
-					bgcolor_bright.getGreen() * brightness,
-					bgcolor_bright.getBlue() * brightness);
+		{
+			fog_range = draw_control.wanted_range*BS + 0.0*MAP_BLOCKSIZE*BS;
+			fog_range *= 0.9;
+			if(draw_control.range_all)
+				fog_range = 100000*BS;
+		}
 
 		/*
-			Update skybox
+			Calculate general brightness
 		*/
-		if(fabs(brightness - old_brightness) > 0.01)
-			update_skybox(driver, tsrc, smgr, skybox, brightness);
+		u32 daynight_ratio = client.getEnv().getDayNightRatio();
+		float time_brightness = (float)decode_light(
+				(daynight_ratio * LIGHT_SUN) / 1000) / 255.0;
+		float direct_brightness = 0;
+		bool sunlight_seen = false;
+		if(g_settings->getBool("free_move")){
+			direct_brightness = time_brightness;
+			sunlight_seen = true;
+		} else {
+			ScopeProfiler sp(g_profiler, "Detecting background light", SPT_AVG);
+			float old_brightness = sky->getBrightness();
+			direct_brightness = (float)client.getEnv().getClientMap()
+					.getBackgroundBrightness(MYMIN(fog_range*1.2, 60*BS),
+					daynight_ratio, (int)(old_brightness*255.5), &sunlight_seen)
+					/ 255.0;
+		}
+		
+		time_of_day = client.getEnv().getTimeOfDayF();
+		float maxsm = 0.05;
+		if(fabs(time_of_day - time_of_day_smooth) > maxsm &&
+				fabs(time_of_day - time_of_day_smooth + 1.0) > maxsm &&
+				fabs(time_of_day - time_of_day_smooth - 1.0) > maxsm)
+			time_of_day_smooth = time_of_day;
+		float todsm = 0.05;
+		if(time_of_day_smooth > 0.8 && time_of_day < 0.2)
+			time_of_day_smooth = time_of_day_smooth * (1.0-todsm)
+					+ (time_of_day+1.0) * todsm;
+		else
+			time_of_day_smooth = time_of_day_smooth * (1.0-todsm)
+					+ time_of_day * todsm;
+			
+		sky->update(time_of_day_smooth, time_brightness, direct_brightness,
+				sunlight_seen);
+		
+		float brightness = sky->getBrightness();
+		video::SColor bgcolor = sky->getBgColor();
+		video::SColor skycolor = sky->getSkyColor();
 
 		/*
 			Update clouds
 		*/
-		if(clouds)
-		{
+		if(clouds){
+			if(sky->getCloudsVisible()){
+				clouds->setVisible(true);
 				clouds->step(dtime);
 				clouds->update(v2f(player_position.X, player_position.Z),
-					brightness);
+						sky->getCloudColor());
+			} else{
+				clouds->setVisible(false);
+			}
 		}
 		
 		/*
@@ -2208,35 +2201,17 @@ void the_game(
 					brightness, farmesh_range);
 		}
 		
-		// Store brightness value
-		old_brightness = brightness;
-
 		/*
 			Fog
 		*/
 		
 		if(g_settings->getBool("enable_fog") == true && !force_fog_off)
 		{
-			f32 range;
-			if(farmesh)
-			{
-				range = BS*farmesh_range;
-			}
-			else
-			{
-				range = draw_control.wanted_range*BS + 0.0*MAP_BLOCKSIZE*BS;
-				range *= 0.9;
-				if(draw_control.range_all)
-					range = 100000*BS;
-				/*if(range < 50*BS)
-					range = range * 0.5 + 25*BS;*/
-			}
-
 			driver->setFog(
 				bgcolor,
 				video::EFT_FOG_LINEAR,
-				range*0.4,
-				range*1.0,
+				fog_range*0.4,
+				fog_range*1.0,
 				0.01,
 				false, // pixel fog
 				false // range fog
@@ -2443,15 +2418,15 @@ void the_game(
 		
 		{
 			TimeTaker timer("beginScene");
-			driver->beginScene(false, true, bgcolor);
 			//driver->beginScene(false, true, bgcolor);
+			//driver->beginScene(true, true, bgcolor);
+			driver->beginScene(true, true, skycolor);
 			beginscenetime = timer.stop(true);
 		}
 		
 		//timer3.stop();
 	
 		//infostream<<"smgr->drawAll()"<<std::endl;
-		
 		{
 			TimeTaker timer("smgr");
 			smgr->drawAll();
@@ -2570,6 +2545,11 @@ void the_game(
 					NULL);
 		}
 
+		// Clear Z buffer
+		driver->clearZBuffer();
+		// Draw some sky things
+		//draw_horizon(driver, camera.getCameraNode());
+		
 		/*
 			End scene
 		*/

src/scriptapi.cpp

@@ -46,6 +46,7 @@ extern "C" {
 #include "content_nodemeta.h"
 #include "utility.h"
 #include "tool.h"
+#include "daynightratio.h"
 
 static void stackDump(lua_State *L, std::ostream &o)
 {

src/server.cpp

@@ -854,7 +854,6 @@ Server::Server(
 	m_craftdef(createCraftDefManager()),
 	m_thread(this),
 	m_emergethread(this),
-	m_time_counter(0),
 	m_time_of_day_send_timer(0),
 	m_uptime(0),
 	m_shutdown_requested(false),
@@ -1197,19 +1196,12 @@ void Server::AsyncRunStep()
 	}
 
 	/*
-		Update m_time_of_day and overall game time
+		Update time of day and overall game time
 	*/
 	{
 		JMutexAutoLock envlock(m_env_mutex);
 
-		m_time_counter += dtime;
-		f32 speed = g_settings->getFloat("time_speed") * 24000./(24.*3600);
-		u32 units = (u32)(m_time_counter*speed);
-		m_time_counter -= (f32)units / speed;
-		
-		m_env->setTimeOfDay((m_env->getTimeOfDay() + units) % 24000);
-		
-		//infostream<<"Server: m_time_of_day = "<<m_time_of_day.get()<<std::endl;
+		m_env->setTimeOfDaySpeed(g_settings->getFloat("time_speed"));
 
 		/*
 			Send to clients at constant intervals
@@ -1231,7 +1223,7 @@ void Server::AsyncRunStep()
 				//Player *player = m_env->getPlayer(client->peer_id);
 				
 				SharedBuffer<u8> data = makePacket_TOCLIENT_TIME_OF_DAY(
-						m_env->getTimeOfDay());
+						m_env->getTimeOfDay(), g_settings->getFloat("time_speed"));
 				// Send as reliable
 				m_con.Send(client->peer_id, 0, data, true);
 			}
@@ -2216,7 +2208,7 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 		// Send time of day
 		{
 			SharedBuffer<u8> data = makePacket_TOCLIENT_TIME_OF_DAY(
-					m_env->getTimeOfDay());
+					m_env->getTimeOfDay(), g_settings->getFloat("time_speed"));
 			m_con.Send(peer_id, 0, data, true);
 		}
 		

src/server.h

@@ -426,11 +426,6 @@ public:
 
 	core::list<PlayerInfo> getPlayerInfo();
 
-	/*u32 getDayNightRatio()
-	{
-		return time_to_daynight_ratio(m_time_of_day.get());
-	}*/
-	
 	// Environment must be locked when called
 	void setTimeOfDay(u32 time)
 	{
@@ -714,10 +709,6 @@ private:
 		Time related stuff
 	*/
 
-	// 0-23999
-	//MutexedVariable<u32> m_time_of_day;
-	// Used to buffer dtime for adding to m_time_of_day
-	float m_time_counter;
 	// Timer for sending time of day over network
 	float m_time_of_day_send_timer;
 	// Uptime of server in seconds

src/sky.cpp

@@ -0,0 +1,446 @@
+#include "sky.h"
+#include "IVideoDriver.h"
+#include "ISceneManager.h"
+#include "ICameraSceneNode.h"
+#include "S3DVertex.h"
+#include "utility.h" // MYMIN
+#include "tile.h" // getTexturePath
+#include "noise.h" // easeCurve
+#include "main.h" // g_profiler
+#include "profiler.h"
+
+//! constructor
+Sky::Sky(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id):
+		scene::ISceneNode(parent, mgr, id),
+		m_first_update(true),
+		m_brightness(0.5),
+		m_cloud_brightness(0.5),
+		m_bgcolor_bright_f(1,1,1,1),
+		m_skycolor_bright_f(1,1,1,1),
+		m_cloudcolor_bright_f(1,1,1,1)
+{
+	setAutomaticCulling(scene::EAC_OFF);
+	Box.MaxEdge.set(0,0,0);
+	Box.MinEdge.set(0,0,0);
+
+	// create material
+
+	video::SMaterial mat;
+	mat.Lighting = false;
+	mat.ZBuffer = video::ECFN_NEVER;
+	mat.ZWriteEnable = false;
+	mat.AntiAliasing=0;
+	mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
+	mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
+	mat.BackfaceCulling = false;
+
+	m_materials[0] = mat;
+
+	m_materials[1] = mat;
+	//m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
+	m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+
+	m_materials[2] = mat;
+	m_materials[2].setTexture(0, mgr->getVideoDriver()->getTexture(
+			getTexturePath("sunrisebg.png").c_str()));
+	m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+	//m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
+
+	for(u32 i=0; i<SKY_STAR_COUNT; i++){
+		m_stars[i] = v3f(
+			myrand_range(-10000,10000),
+			myrand_range(-10000,10000),
+			myrand_range(-10000,10000)
+		);
+		m_stars[i].normalize();
+	}
+}
+
+void Sky::OnRegisterSceneNode()
+{
+	if (IsVisible)
+		SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
+
+	scene::ISceneNode::OnRegisterSceneNode();
+}
+
+const core::aabbox3d<f32>& Sky::getBoundingBox() const
+{
+	return Box;
+}
+
+//! renders the node.
+void Sky::render()
+{
+	video::IVideoDriver* driver = SceneManager->getVideoDriver();
+	scene::ICameraSceneNode* camera = SceneManager->getActiveCamera();
+
+	if (!camera || !driver)
+		return;
+	
+	ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
+
+	// draw perspective skybox
+
+	core::matrix4 translate(AbsoluteTransformation);
+	translate.setTranslation(camera->getAbsolutePosition());
+
+	// Draw the sky box between the near and far clip plane
+	const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
+	core::matrix4 scale;
+	scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
+
+	driver->setTransform(video::ETS_WORLD, translate * scale);
+	
+	if(m_sunlight_seen)
+	{
+		float sunsize = 0.07;
+		video::SColorf suncolor_f(1, 1, 0, 1);
+		suncolor_f.r = 1;
+		suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7+m_time_brightness*(0.5)));
+		suncolor_f.b = MYMAX(0.0, m_brightness*0.95);
+		video::SColorf suncolor2_f(1, 1, 1, 1);
+		suncolor_f.r = 1;
+		suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85+m_time_brightness*(0.5)));
+		suncolor_f.b = MYMAX(0.0, m_brightness);
+
+		float moonsize = 0.04;
+		video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
+		video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
+		
+		float nightlength = 0.41;
+		float wn = nightlength / 2;
+		float wicked_time_of_day = 0;
+		if(m_time_of_day > wn && m_time_of_day < 1.0 - wn)
+			wicked_time_of_day = (m_time_of_day - wn)/(1.0-wn*2)*0.5 + 0.25;
+		else if(m_time_of_day < 0.5)
+			wicked_time_of_day = m_time_of_day / wn * 0.25;
+		else
+			wicked_time_of_day = 1.0 - ((1.0-m_time_of_day) / wn * 0.25);
+		/*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
+				<<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
+
+		video::SColor suncolor = suncolor_f.toSColor();
+		video::SColor suncolor2 = suncolor2_f.toSColor();
+		video::SColor mooncolor = mooncolor_f.toSColor();
+		video::SColor mooncolor2 = mooncolor2_f.toSColor();
+
+		const f32 t = 1.0f;
+		const f32 o = 0.0f;
+		static const u16 indices[4] = {0,1,2,3};
+		video::S3DVertex vertices[4];
+
+		driver->setMaterial(m_materials[2]);
+		{
+			float mid1 = 0.25;
+			float mid = (wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1));
+			float a_ = 1.0 - fabs(wicked_time_of_day - mid) * 35.0;
+			float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
+			//std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
+			video::SColor c(255,255,255,255);
+			float y = -(1.0 - a) * 0.2;
+			vertices[0] = video::S3DVertex(-1,-0.05+y,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( 1,-0.05+y,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( 1, 0.2+y,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-1, 0.2+y,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				if(wicked_time_of_day < 0.5)
+					// Switch from -Z (south) to +X (east)
+					vertices[i].Pos.rotateXZBy(90);
+				else
+					// Switch from -Z (south) to -X (west)
+					vertices[i].Pos.rotateXZBy(-90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+
+		driver->setMaterial(m_materials[1]);
+		
+		// Draw sun
+		if(wicked_time_of_day > 0.15 && wicked_time_of_day < 0.85)
+		{
+			float d = sunsize * 1.7;
+			video::SColor c = suncolor;
+			c.setAlpha(0.05*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+
+			d = sunsize * 1.2;
+			c = suncolor;
+			c.setAlpha(0.15*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+
+			d = sunsize;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, suncolor, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, suncolor, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, suncolor, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, suncolor, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+
+			d = sunsize * 0.7;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, suncolor2, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, suncolor2, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, suncolor2, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, suncolor2, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+		// Draw moon
+		if(wicked_time_of_day < 0.3 || wicked_time_of_day > 0.7)
+		{
+			float d = moonsize * 1.9;
+			video::SColor c = mooncolor;
+			c.setAlpha(0.05*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			
+			d = moonsize * 1.3;
+			c = mooncolor;
+			c.setAlpha(0.15*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			
+			d = moonsize;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, mooncolor, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, mooncolor, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, mooncolor, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, mooncolor, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			
+			float d2 = moonsize * 0.6;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, mooncolor2, t, t);
+			vertices[1] = video::S3DVertex( d2,-d,-1, 0,0,1, mooncolor2, o, t);
+			vertices[2] = video::S3DVertex( d2, d2,-1, 0,0,1, mooncolor2, o, o);
+			vertices[3] = video::S3DVertex(-d, d2,-1, 0,0,1, mooncolor2, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+		// Stars
+		do{
+			float starbrightness = MYMAX(0, MYMIN(1,
+					(0.285 - fabs(wicked_time_of_day < 0.5 ?
+					wicked_time_of_day : (1.0 - wicked_time_of_day))) * 10));
+			float f = starbrightness;
+			video::SColor starcolor(255, f*120,f*120,f*120);
+			if(starcolor.getBlue() < m_skycolor.getBlue())
+				break;
+			u16 indices[SKY_STAR_COUNT*4];
+			video::S3DVertex vertices[SKY_STAR_COUNT*4];
+			for(u32 i=0; i<SKY_STAR_COUNT; i++){
+				indices[i*4+0] = i*4+0;
+				indices[i*4+1] = i*4+1;
+				indices[i*4+2] = i*4+2;
+				indices[i*4+3] = i*4+3;
+				v3f p = m_stars[i];
+				core::CMatrix4<f32> a;
+				float d = 0.005;
+				a.buildRotateFromTo(v3f(0,1,0), v3f(d,1,0));
+				v3f p1 = p;
+				a.rotateVect(p1);
+				a.buildRotateFromTo(v3f(0,1,0), v3f(d,1+d/2,d));
+				v3f p2 = p;
+				a.rotateVect(p2);
+				a.buildRotateFromTo(v3f(0,1,0), v3f(0,1,d));
+				v3f p3 = p;
+				a.rotateVect(p3);
+				p.rotateXYBy(wicked_time_of_day * 360 - 90);
+				p1.rotateXYBy(wicked_time_of_day * 360 - 90);
+				p2.rotateXYBy(wicked_time_of_day * 360 - 90);
+				p3.rotateXYBy(wicked_time_of_day * 360 - 90);
+				vertices[i*4+0].Pos = p;
+				vertices[i*4+0].Color = starcolor;
+				vertices[i*4+1].Pos = p1;
+				vertices[i*4+1].Color = starcolor;
+				vertices[i*4+2].Pos = p2;
+				vertices[i*4+2].Color = starcolor;
+				vertices[i*4+3].Pos = p3;
+				vertices[i*4+3].Color = starcolor;
+			}
+			driver->drawVertexPrimitiveList(vertices, SKY_STAR_COUNT*4,
+					indices, SKY_STAR_COUNT, video::EVT_STANDARD,
+					scene::EPT_QUADS, video::EIT_16BIT);
+		}while(0);
+		
+		for(u32 j=0; j<2; j++)
+		{
+			vertices[0] = video::S3DVertex(-1,-1.0,-1, 0,0,1, m_skycolor, t, t);
+			vertices[1] = video::S3DVertex( 1,-1.0,-1, 0,0,1, m_skycolor, o, t);
+			vertices[2] = video::S3DVertex( 1,-0.02,-1, 0,0,1, m_skycolor, o, o);
+			vertices[3] = video::S3DVertex(-1,-0.02,-1, 0,0,1, m_skycolor, t, o);
+			for(u32 i=0; i<4; i++){
+				//if(wicked_time_of_day < 0.5)
+				if(j==0)
+					// Switch from -Z (south) to +X (east)
+					vertices[i].Pos.rotateXZBy(90);
+				else
+					// Switch from -Z (south) to -X (west)
+					vertices[i].Pos.rotateXZBy(-90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+	}
+}
+
+void Sky::update(float time_of_day, float time_brightness,
+		float direct_brightness, bool sunlight_seen)
+{
+	// Stabilize initial brightness and color values by flooding updates
+	if(m_first_update){
+		/*dstream<<"First update with time_of_day="<<time_of_day
+				<<" time_brightness="<<time_brightness
+				<<" direct_brightness="<<direct_brightness
+				<<" sunlight_seen="<<sunlight_seen<<std::endl;*/
+		m_first_update = false;
+		for(u32 i=0; i<100; i++){
+			update(time_of_day, time_brightness, direct_brightness,
+					sunlight_seen);
+		}
+		return;
+	}
+
+	m_time_of_day = time_of_day;
+	m_time_brightness = time_brightness;
+	m_sunlight_seen = sunlight_seen;
+	
+	bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.50);
+
+	video::SColorf bgcolor_bright_normal_f(170./255,200./255,230./255, 1.0);
+	video::SColorf bgcolor_bright_indoor_f(100./255,100./255,100./255, 1.0);
+	//video::SColorf bgcolor_bright_dawn_f(0.666,200./255*0.7,230./255*0.5,1.0);
+	//video::SColorf bgcolor_bright_dawn_f(0.666,0.549,0.220,1.0);
+	//video::SColorf bgcolor_bright_dawn_f(0.666*1.2,0.549*1.0,0.220*1.0, 1.0);
+	video::SColorf bgcolor_bright_dawn_f(0.666*1.2,0.549*1.0,0.220*1.2,1.0);
+
+	video::SColorf skycolor_bright_normal_f =
+			video::SColor(255, 140, 186, 250);
+	video::SColorf skycolor_bright_dawn_f =
+			video::SColor(255, 180, 186, 250);
+	
+	video::SColorf cloudcolor_bright_normal_f =
+			video::SColor(255, 240,240,255);
+	//video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
+	//video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
+	video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
+
+	if(sunlight_seen){
+		//m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
+		m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
+	}
+	else{
+		if(direct_brightness < m_brightness)
+			m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
+		else
+			m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
+	}
+	
+	m_clouds_visible = true;
+	float color_change_fraction = 0.98;
+	if(sunlight_seen){
+		if(is_dawn){
+			m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
+					bgcolor_bright_dawn_f, color_change_fraction);
+			m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
+					skycolor_bright_dawn_f, color_change_fraction);
+			m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
+					cloudcolor_bright_dawn_f, color_change_fraction);
+		} else {
+			m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
+					bgcolor_bright_normal_f, color_change_fraction);
+			m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
+					skycolor_bright_normal_f, color_change_fraction);
+			m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
+					cloudcolor_bright_normal_f, color_change_fraction);
+		}
+	} else {
+		m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
+				bgcolor_bright_indoor_f, color_change_fraction);
+		m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
+				cloudcolor_bright_normal_f, color_change_fraction);
+		m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
+				bgcolor_bright_indoor_f, color_change_fraction);
+		m_clouds_visible = false;
+	}
+	video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
+	m_bgcolor = video::SColor(
+			255,
+			bgcolor_bright.getRed() * m_brightness,
+			bgcolor_bright.getGreen() * m_brightness,
+			bgcolor_bright.getBlue() * m_brightness);
+	
+	video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
+	m_skycolor = video::SColor(
+			255,
+			skycolor_bright.getRed() * m_brightness,
+			skycolor_bright.getGreen() * m_brightness,
+			skycolor_bright.getBlue() * m_brightness);
+	
+	float cloud_direct_brightness = 0;
+	if(sunlight_seen){
+		cloud_direct_brightness = time_brightness;
+		if(time_brightness >= 0.2 && time_brightness < 0.7)
+				cloud_direct_brightness *= 1.3;
+	} else {
+		cloud_direct_brightness = direct_brightness;
+	}
+	m_cloud_brightness = m_cloud_brightness * 0.95 +
+			cloud_direct_brightness * (1.0 - 0.95);
+	m_cloudcolor_f = video::SColorf(
+			m_cloudcolor_bright_f.getRed() * m_cloud_brightness,
+			m_cloudcolor_bright_f.getGreen() * m_cloud_brightness,
+			m_cloudcolor_bright_f.getBlue() * m_cloud_brightness,
+			1.0);
+
+}
+
+

src/sky.h

@@ -0,0 +1,84 @@
+/*
+Minetest-c55
+Copyright (C) 2012 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 General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU 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 "common_irrlicht.h"
+#include <ISceneNode.h>
+
+#ifndef SKY_HEADER
+#define SKY_HEADER
+
+#define SKY_MATERIAL_COUNT 3
+#define SKY_STAR_COUNT 200
+
+// Skybox, rendered with zbuffer turned off, before all other nodes.
+class Sky : public scene::ISceneNode
+{
+public:
+	//! constructor
+	Sky(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id);
+
+	virtual void OnRegisterSceneNode();
+
+	//! renders the node.
+	virtual void render();
+
+	virtual const core::aabbox3d<f32>& getBoundingBox() const;
+
+	// Used by Irrlicht for optimizing rendering
+	virtual video::SMaterial& getMaterial(u32 i)
+	{ return m_materials[i]; }
+
+	// Used by Irrlicht for optimizing rendering
+	virtual u32 getMaterialCount() const
+	{ return SKY_MATERIAL_COUNT; }
+
+	void update(float m_time_of_day, float time_brightness,
+			float direct_brightness, bool sunlight_seen);
+	
+	float getBrightness(){ return m_brightness; }
+	video::SColor getBgColor(){ return m_bgcolor; }
+	video::SColor getSkyColor(){ return m_skycolor; }
+	
+	bool getCloudsVisible(){ return m_clouds_visible; }
+	video::SColorf getCloudColor(){ return m_cloudcolor_f; }
+
+private:
+	core::aabbox3d<f32> Box;
+	video::SMaterial m_materials[SKY_MATERIAL_COUNT];
+	
+	bool m_first_update;
+	float m_time_of_day;
+	float m_time_brightness;
+	bool m_sunlight_seen;
+	float m_brightness;
+	float m_cloud_brightness;
+	bool m_clouds_visible;
+	video::SColorf m_bgcolor_bright_f;
+	video::SColorf m_skycolor_bright_f;
+	video::SColorf m_cloudcolor_bright_f;
+	video::SColor m_bgcolor;
+	video::SColor m_skycolor;
+	video::SColorf m_cloudcolor_f;
+	v3f m_stars[SKY_STAR_COUNT];
+	u16 m_star_indices[SKY_STAR_COUNT*4];
+	video::S3DVertex m_star_vertices[SKY_STAR_COUNT*4];
+};
+
+#endif
+

src/utility.h

@@ -1751,21 +1751,6 @@ std::string deSerializeJsonString(std::istream &is);
 
 //
 
-inline u32 time_to_daynight_ratio(u32 time_of_day)
-{
-	s32 t = time_of_day%24000;
-	if(t < 4500 || t >= 19500)
-		return 150;
-	else if(t < 5000 || t >= 19000)
-		return 350;
-	else if(t < 5500 || t >= 18500)
-		return 500;
-	else if(t < 6000 || t >= 18000)
-		return 750;
-	else
-		return 1000;
-}
-
 // Random helper. Usually d=BS
 inline core::aabbox3d<f32> getNodeBox(v3s16 p, float d)
 {