Use full 4x4 matrix for affine transformation

ray-tracing-pbrt-scene/src/lib.rs

@@ -487,6 +487,7 @@ fn parse_transform(input: &mut Tokenizer) -> Result<AffineTransform> {
         [v[0], v[4], v[8], v[12]],
         [v[1], v[5], v[9], v[13]],
         [v[2], v[6], v[10], v[14]],
+        [v[3], v[7], v[11], v[15]],
     ])
     .ok_or(miette!("Unable to invert transformation"))
 }
@@ -757,6 +758,7 @@ fn inner_parse_pbrt(path: impl AsRef<Path> + std::fmt::Debug) -> Result<Pbrt> {
                 *context.ctm.last_mut().unwrap() = affine_transform
             }
             Statement::Shape(shape_type, shape_alpha) => {
+                dbg!(&context);
                 pbrt.scene.shapes.push(Shape {
                     ctm: context.get_ctm(),
                     material: Arc::clone(