modeling/src/maths/vec4/transform.js

  1. /**
  2.  * Transform the given vector using the given matrix.
  3.  *
  4.  * @param {vec4} out - receiving vector
  5.  * @param {vec4} vector - vector to transform
  6.  * @param {mat4} matrix - matrix to transform with
  7.  * @returns {vec4} out
  8.  * @alias module:modeling/maths/vec4.transform
  9.  */
  10. const transform = (out, vector, matrix) => {
  11.   const [x, y, z, w] = vector
  13.   out[0] = matrix[0] * x + matrix[4] * y + matrix[8] * z + matrix[12] * w
  14.   out[1] = matrix[1] * x + matrix[5] * y + matrix[9] * z + matrix[13] * w
  15.   out[2] = matrix[2] * x + matrix[6] * y + matrix[10] * z + matrix[14] * w
  16.   out[3] = matrix[3] * x + matrix[7] * y + matrix[11] * z + matrix[15] * w
  17.   return out
  18. }
  20. module.exports = transform