snap = (out, vector, epsilon) => {
  out[0] = Math.round(vector[0] / epsilon) * epsilon + 0
  out[1] = Math.round(vector[1] / epsilon) * epsilon + 0
  out[2] = Math.round(vector[2] / epsilon) * epsilon + 0
  return out
}
Snaps the coordinates of the given vector to the given epsilon.

@param {vec3} out - receiving vector
@param {vec3} vector - vector to snap
@param {Number} epsilon - epsilon of precision, less than 0
@returns {vec3} out
@alias module:modeling/maths/vec3.snap