Method: CGLM::Mat4.random

Defined in:
ext/cglm/rb_cglm_mat4.c

.random([dest]) ⇒ dest | new Mat4

Fills dest or a new Mat4 with a random translation and rotation, and returns it.

Returns:



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# File 'ext/cglm/rb_cglm_mat4.c', line 255

VALUE rb_cglm_mat4_new_random(int argc, VALUE *argv, VALUE self) {
  VALUE dest;
  rb_scan_args(argc, argv, "01", &dest);
  if (NIL_P(dest)) dest = MAT4_NEW(ALLOC_MAT4);

  glm_mat4_copy(GLM_MAT4_IDENTITY, VAL2MAT4(dest));
  
  /* random position */
  VAL2MAT4(dest)[3][0] = drand48();
  VAL2MAT4(dest)[3][1] = drand48();
  VAL2MAT4(dest)[3][2] = drand48();
  
  /* random rotatation around random axis with random angle */
  glm_rotate(VAL2MAT4(dest), drand48(), (vec3){drand48(), drand48(), drand48()});
  
  /* random scale */
  /* glm_scale(dest, (vec3){drand48(), drand48(), drand48()}); */

  return dest;
}