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Add voxelarea.lua helper to builtin
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@ -25,4 +25,4 @@ dofile(minetest.get_modpath("__builtin").."/static_spawn.lua")
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dofile(minetest.get_modpath("__builtin").."/detached_inventory.lua")
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dofile(minetest.get_modpath("__builtin").."/falling.lua")
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dofile(minetest.get_modpath("__builtin").."/features.lua")
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dofile(minetest.get_modpath("__builtin").."/voxelarea.lua")
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46
builtin/voxelarea.lua
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46
builtin/voxelarea.lua
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@ -0,0 +1,46 @@
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VoxelArea = {
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MinEdge = {x=1, y=1, z=1},
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MaxEdge = {x=0, y=0, z=0},
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ystride = 0,
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zstride = 0,
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}
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function VoxelArea:new(o)
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o = o or {}
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setmetatable(o, self)
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self.__index = self
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local e = o:getExtent()
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o.ystride = e.x
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o.zstride = e.x * e.y
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return o
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end
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function VoxelArea:getExtent()
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return {
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x = self.MaxEdge.x - self.MinEdge.x + 1,
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y = self.MaxEdge.y - self.MinEdge.y + 1,
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z = self.MaxEdge.z - self.MinEdge.z + 1,
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}
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end
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function VoxelArea:getVolume()
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local e = self:getExtent()
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return e.x * e.y * e.z
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end
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function VoxelArea:index(x, y, z)
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local i = (z - self.MinEdge.z) * self.zstride +
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(y - self.MinEdge.y) * self.ystride +
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(x - self.MinEdge.x) + 1
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return math.floor(i)
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end
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function VoxelArea:indexp(p)
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local i = (p.z - self.MinEdge.z) * self.zstride +
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(p.y - self.MinEdge.y) * self.ystride +
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(p.x - self.MinEdge.x) + 1
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return math.floor(i)
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end
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@ -1572,6 +1572,16 @@ methods:
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^ will be ignored
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- update_liquids(): Update liquid flow
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VoxelArea: A helper class for voxel areas
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- Can be created via VoxelArea:new{MinEdge=pmin, MaxEdge=pmax}
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- Coordinates are *inclusive*, like most other things in Minetest
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methods:
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- getExtent(): returns a 3d vector containing the size of the area formed by MinEdge and MaxEdge
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- getVolume(): returns the volume of the area formed by MinEdge and MaxEdge
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- index(x, y, z): returns the index of an absolute position in a flat array starting at 1
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^ useful for things like VoxelManip, raw Schematic specifiers, PerlinNoiseMap:get2d/3dMap, and so on
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- indexp(p): same as above, except takes a vector
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Mapgen objects
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---------------
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A mapgen object is a construct used in map generation. Mapgen objects can be used by an on_generate
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