void matrix_unit(MATRIX output) {

  // Create a unit matrix.
  memset(output, 0, sizeof(MATRIX));
  output[0x00] = 1.00f;
  output[0x05] = 1.00f;
  output[0x0A] = 1.00f;
  output[0x0F] = 1.00f;

 }

 //////////////////////
 // CREATE FUNCTIONS //
 //////////////////////

 void create_local_world(MATRIX local_world, VECTOR translation, VECTOR rotation) {

  // Create the local_world matrix.
  matrix_unit(local_world);
  matrix_rotate(local_world, local_world, rotation);
  matrix_translate(local_world, local_world, translation);

 }