"Ray tracing (physics)" . . "Rays" . . . . "wave rays" . "Ray tracing (physics)" . . . "ray tracer" . . "rays" . . . "Raytrace modelling" . . "tracing" . . . . "Ray tracing" . "ray tracing" . "ray theory" . "shooting boundary ray" . "ray-tracing" . "ray tracing (physics)" .