Add more scenes

ray-tracing-scene/src/triangle_bvh.rs

@@ -19,6 +19,39 @@ pub struct BVHMaterial<R: Rng> {
     pub light: Option<Box<dyn Light<R>>>,
 }
 
+impl<R: Rng> BVHMaterial<R> {
+    pub fn new_material<M: Material<R> + 'static>(material: M) -> Self {
+        Self {
+            material: Some(Box::new(material)),
+            light: None,
+        }
+    }
+
+    pub fn new_light<L: Light<R> + 'static>(light: L) -> Self {
+        Self {
+            material: None,
+            light: Some(Box::new(light)),
+        }
+    }
+
+    pub fn new_material_light<M: Material<R> + 'static, L: Light<R> + 'static>(
+        material: M,
+        light: L,
+    ) -> Self {
+        Self {
+            material: Some(Box::new(material)),
+            light: Some(Box::new(light)),
+        }
+    }
+
+    pub fn new_empty() -> Self {
+        Self {
+            material: None,
+            light: None,
+        }
+    }
+}
+
 #[derive(Debug, Clone, Copy)]
 enum Node {
     Inner {