fromVector2 = (out, vector, z = 0) => {
  out[0] = vector[0]
  out[1] = vector[1]
  out[2] = z
  return out
}
Create a new vector by extending a 2D vector with a Z value.

@param {vec3} out - receiving vector
@param {Array} vector - 2D vector of values
@param {Number} [z=0] - Z value
@returns {vec3} out
@alias module:modeling/maths/vec3.fromVec2