PerlinNoiseMap

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A fast, bulk perlin noise generator Can be created via

  • <source enclose="none">PerlinNoiseMap(noiseparams, size)</source>
  • <source enclose="none">minetest.get_perlin_map(noiseparams, size)</source>

The latter function must not be called until after the world is finished initializing, so it must be called during some kind of callback rather than at the top level mod initialization code. The first constructor, on the other hand, may be called at any time since it does not depend on the world's seed.

Methods

<source enclose="none">get2dMap(pos)</source> <source enclose="none">size.x</source> x <source enclose="none">size.y</source> 2d array of 2d noise values starting at <source enclose="none">pos={x=,y=}</source>
<source enclose="none">get3dMap(pos)</source> <source enclose="none">size.x</source> x <source enclose="none">size.y</source> x <source enclose="none">size.z</source> 3d array of 3d noise values starting at <source enclose="none">pos={x=,y=,z=}</source>
<source enclose="none">get2dMap_flat(pos)</source> Flat <source enclose="none">size.x</source> * <source enclose="none">size.y</source> element array of 2d noise values starting at <source enclose="none">pos={x=,y=}</source>
<source enclose="none">get3dMap_flat(pos)</source> Same as get2dMap_flat, but 3d noise

Noise Params

Here's an example of the noiseparams: <source>local testparam = {

  offset = 0,
  scale = 1,
  spread = {x=2048, y=2048, z=2048},
  seed = 1337,
  octaves = 6,
  persist = 0.6

}</source>

  • spread: defines how fast the (ex.) terrain high changes (frequency)
  • seed: every seed generates a different perlin map
  • octaves: higher value, higher details

Examples

<source>minetest.register_on_generated(function(minp, maxp, seed)

  local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
  local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
  local data = vm:get_data()
  
  --get side length of the current mapgen block
  local side_length = maxp.x - minp.x + 1
  local map_lengths_xyz = {x=side_length, y=side_length, z=side_length}
  local perlin_map = minetest.get_perlin_map(testparam, map_lengths_xyz):get2dMap_flat(minp)
  --loop
  local perlin_index = 1
  for z = minp.z, maxp.z do
     for y = minp.y, maxp.y do
        local vi = area:index(minp.x, y, z)
        for x = minp.x, maxp.x do
            print("Some spam value: "..tostring(perlin_map[vi])
            --more efficient coding - x++
            perlin_index = perlin_index + 1
            vi = vi + 1
        end
        --go back, one side_length
        perlin_index = perlin_index - side_length
     end
     --go forward, one side_length
     perlin_index = perlin_index + side_length
  end

end)</source>

See also

External Links

Minetest forum thread: "minetest.get_perlin() and minetest.get_perlin_map() Return nil"

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