- // TODO cache the inverse transformation for performance
- LinAl::SquareMatrix<T, D+1> inverse_trans = LinAl::invert(transformation.get_matrix());
- Ray<T, D> trans_ray(reduce_vector(inverse_trans*augment_vector(ray.get_start(), T(1))),
- reduce_vector(inverse_trans*augment_vector(ray.get_direction(), T(0))));
- return shape->check_intersection(trans_ray);
+ Ray<T, D> local_ray(inverse_trans.transform(ray.get_start()),
+ inverse_trans.transform_linear(ray.get_direction()));
+ return shape->check_intersection(local_ray);