mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-12-18 03:35:59 +01:00
1310dae884
This is just the start, if my plans work out. The eventual aim here is to implement a generic Heightmap2D class, just like Vector3. This will make interacting with heightmaps much easier.
51 lines
1.7 KiB
Lua
51 lines
1.7 KiB
Lua
local wea = worldeditadditions
|
|
local Vector3 = wea.Vector3
|
|
|
|
|
|
--- Given a manip object and associates, generates a 2D x/z heightmap.
|
|
-- Note that pos1 and pos2 should have already been pushed through
|
|
-- worldedit.sort_pos(pos1, pos2) before passing them to this function.
|
|
-- @param pos1 Vector Position 1 of the region to operate on
|
|
-- @param pos2 Vector Position 2 of the region to operate on
|
|
-- @param manip VoxelManip The VoxelManip object.
|
|
-- @param area area The associated area object.
|
|
-- @param data table The associated data object.
|
|
-- @return table,table The ZERO-indexed heightmap data (as 1 single flat array), followed by the size of the heightmap in the form { z = size_z, x = size_x }.
|
|
local function make_heightmap(pos1, pos2, manip, area, data)
|
|
-- z y x (in reverse for little-endian machines) is the preferred loop order, but that isn't really possible here
|
|
|
|
local heightmap = {}
|
|
local hi = 0
|
|
local changes = { updated = 0, skipped_columns = 0 }
|
|
for z = pos1.z, pos2.z, 1 do
|
|
for x = pos1.x, pos2.x, 1 do
|
|
local found_node = false
|
|
-- Scan each column top to bottom
|
|
for y = pos2.y+1, pos1.y, -1 do
|
|
local i = area:index(x, y, z)
|
|
if not (wea.is_airlike(data[i]) or wea.is_liquidlike(data[i])) then
|
|
-- It's the first non-airlike node in this column
|
|
-- Start heightmap values from 1 (i.e. there's at least 1 node in the column)
|
|
heightmap[hi] = (y - pos1.y) + 1
|
|
found_node = true
|
|
break
|
|
end
|
|
end
|
|
|
|
if not found_node then heightmap[hi] = -1 end
|
|
hi = hi + 1
|
|
end
|
|
end
|
|
|
|
local heightmap_size = Vector3.new(
|
|
(pos2.x - pos1.x) + 1, -- x
|
|
0, -- y
|
|
(pos2.z - pos1.z) + 1 -- z
|
|
)
|
|
|
|
return heightmap, heightmap_size
|
|
end
|
|
|
|
|
|
return make_heightmap
|