rotate method

void rotate(
  1. Matrix4 matrix
)

Rotates this by the upper-left 3x3 of matrix, ignoring translation.

Implementation

void rotate(Matrix4 matrix) {
  final x = this.x;
  final y = this.y;
  final z = this.z;
  this.x = (matrix[0] * x) + (matrix[4] * y) + (matrix[8] * z);
  this.y = (matrix[1] * x) + (matrix[5] * y) + (matrix[9] * z);
  this.z = (matrix[2] * x) + (matrix[6] * y) + (matrix[10] * z);
}