mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-25 16:43:05 +00:00
Starbeamrainbowlabs
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.
71 lines
3.4 KiB
Lua
71 lines
3.4 KiB
Lua
local wea = worldeditadditions
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local Vector3 = wea.Vector3
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--- Applies changes to a heightmap to a Voxel Manipulator data block.
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-- @param pos1 vector Position 1 of the defined region
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-- @param pos2 vector Position 2 of the defined region
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-- @param area VoxelArea The VoxelArea object (see worldedit.manip_helpers.init)
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-- @param data number[] The node ids data array containing the slice of the Minetest world extracted using the Voxel Manipulator.
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-- @param heightmap_old number[] The original heightmap from worldeditadditions.make_heightmap.
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-- @param heightmap_new number[] The new heightmap containing the altered updated values. It is expected that worldeditadditions.table.shallowcopy be used to make a COPY of the data worldeditadditions.make_heightmap for this purpose. Both heightmap_old AND heightmap_new are REQUIRED in order for this function to work.
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-- @param heightmap_size vector The x / z size of the heightmap. Any y value set in the vector is ignored.
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-- @returns bool, string|{ added: number, removed: number } A bool indicating whether the operation was successful or not, followed by either an error message as a string (if it was not successful) or a table of statistics (if it was successful).
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local function apply_heightmap_changes(pos1, pos2, area, data, heightmap_old, heightmap_new, heightmap_size)
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local stats = { added = 0, removed = 0 }
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local node_id_air = minetest.get_content_id("air")
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local node_id_ignore = minetest.get_content_id("ignore")
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for z = heightmap_size.z - 1, 0, -1 do
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for x = heightmap_size.x - 1, 0, -1 do
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local hi = z*heightmap_size.x + x
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local height_old = heightmap_old[hi]
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local height_new = heightmap_new[hi]
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-- print("[conv/save] hi", hi, "height_old", heightmap_old[hi], "height_new", heightmap_new[hi], "z", z, "x", x, "pos1.y", pos1.y)
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-- Lua doesn't have a continue statement :-/
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if height_old == height_new then
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-- noop
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elseif height_new < height_old then
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local node_id_replace = data[area:index(
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pos1.x + x,
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pos1.y + height_old + 1,
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pos1.z + z
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)]
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-- Unlikely, but if it can happen, it *will* happen.....
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if node_id_replace == node_id_ignore then
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node_id_replace = node_id_air
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end
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stats.removed = stats.removed + (height_old - height_new)
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local y = height_new
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while y < height_old do
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local ci = area:index(pos1.x + x, pos1.y + y, pos1.z + z)
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-- print("[conv/save] remove at y", y, "→", pos1.y + y, "current:", minetest.get_name_from_content_id(data[ci]))
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if data[ci] ~= node_id_ignore then
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data[ci] = node_id_replace
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end
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y = y + 1
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end
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else -- height_new > height_old
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-- We subtract one because the heightmap starts at 1 (i.e. 1 = 1 node in the column), but the selected region is inclusive
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local node_id = data[area:index(pos1.x + x, pos1.y + (height_old - 1), pos1.z + z)]
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-- print("[conv/save] filling with ", node_id, "→", minetest.get_name_from_content_id(node_id))
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stats.added = stats.added + (height_new - height_old)
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local y = height_old
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while y < height_new do
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local ci = area:index(pos1.x + x, pos1.y + y, pos1.z + z)
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-- print("[conv/save] add at y", y, "→", pos1.y + y, "current:", minetest.get_name_from_content_id(data[ci]))
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if data[ci] ~= node_id_ignore then
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data[ci] = node_id
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end
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y = y + 1
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end
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end
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end
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end
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return true, stats
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end
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return apply_heightmap_changes
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