modeling/src/maths/mat4/fromScaling.js

  1. /**
  2.  * Creates a matrix from a vector scaling.
  3.  * This is equivalent to (but much faster than):
  4.  *
  5.  *     mat4.identity(dest)
  6.  *     mat4.scale(dest, dest, vec)
  7.  *
  8.  * @param {mat4} out - receiving matrix
  9.  * @param {vec3} vector - X, Y, Z factors by which to scale
  10.  * @returns {mat4} out
  11.  * @alias module:modeling/maths/mat4.fromScaling
  12.  * @example
  13.  * let matrix = fromScaling([1, 2, 0.5])
  14.  */
  15. const fromScaling = (out, vector) => {
  16.   out[0] = vector[0]
  17.   out[1] = 0
  18.   out[2] = 0
  19.   out[3] = 0
  20.   out[4] = 0
  21.   out[5] = vector[1]
  22.   out[6] = 0
  23.   out[7] = 0
  24.   out[8] = 0
  25.   out[9] = 0
  26.   out[10] = vector[2]
  27.   out[11] = 0
  28.   out[12] = 0
  29.   out[13] = 0
  30.   out[14] = 0
  31.   out[15] = 1
  32.   return out
  33. }
  35. module.exports = fromScaling