void tracing for spot lights

src/scene/mod.rs

@@ -82,7 +82,7 @@ impl Scene {
         let shade = (rng.gen_range(0..25) as f32) / 100.0;
         let cube = Cube {
             pos: vec3(10.0, 10.0, 10.0),
-            color: vec3(shade, 1.0, shade),
+            color: vec3(1.0, 1.0, 0.0),
             tex_coord: vec2(0.0, 0.0)
         };