modeling/src/maths/vec3/transform.js

  1. /**
  2.  * Transforms the given vector using the given matrix.
  3.  *
  4.  * @param {vec3} out - receiving vector
  5.  * @param {vec3} vector - vector to transform
  6.  * @param {mat4} matrix - transform matrix
  7.  * @returns {vec3} out
  8.  * @alias module:modeling/maths/vec3.transform
  9.  */
  10. const transform = (out, vector, matrix) => {
  11.   const x = vector[0]
  12.   const y = vector[1]
  13.   const z = vector[2]
  14.   let w = matrix[3] * x + matrix[7] * y + matrix[11] * z + matrix[15]
  15.   w = w || 1.0
  16.   out[0] = (matrix[0] * x + matrix[4] * y + matrix[8] * z + matrix[12]) / w
  17.   out[1] = (matrix[1] * x + matrix[5] * y + matrix[9] * z + matrix[13]) / w
  18.   out[2] = (matrix[2] * x + matrix[6] * y + matrix[10] * z + matrix[14]) / w
  19.   return out
  20. }
  22. module.exports = transform