continuous-perlin.js

var perlin = require('perlin').noise.perlin3
var fill = require('ndarray-fill')
var zeros = require('zeros')

var scale = 0.075
var threshold = 0.125

// Untested in 3D, but "theoretically" this should
// work. Using the equivalent 2d getter with the
// continuous-box2d demo works well.

var field = require('ndarray-continuous')({
  shape: [32, 32, 32],
  getter: function(position, done) {
    var shape = this.shape
    var array = zeros(shape)
    
    fill(array, function(x, y, z) {
      return perlin(
          (position[0] * shape[0] + x) * scale
        , (position[1] * shape[1] + y) * scale
        , (position[2] * shape[2] + z) * scale
      ) > threshold ? 0 : 1
    })

    return done(null, array)
  }
})