Base render of surface normal, and abstract shading and tracing to the

trace module

1 files changed, 30 insertions, 0 deletions

diff --git a/src/trace/mod.rs b/src/trace/mod.rs
new file mode 100644
index 0000000..90f12da
--- /dev/null
+++ b/src/trace/mod.rs
@@ -0,0 +1,30 @@
+use crate::scene::Scene;
+use crate::core::{Spectrum, Ray, Vector3f};
+
+/// Simple surface normal tracer
+///
+/// This ray tracer bases color values on the hit surface normals
+pub struct NormTracer {}
+
+/// Alias for chosen trace implementation.
+///
+/// This is swiched at compile time to save alot of time.
+pub type Tracer = NormTracer;
+
+impl NormTracer {
+    pub fn new() -> NormTracer {
+        NormTracer {}
+    }
+
+    pub fn trace(&self, scn: &Scene, ray: &Ray) -> Spectrum {
+        // Trace ray
+        if let Some(i) = scn.intersect(ray) {
+            let p = ray.at(i.t);
+            let norm = i.shp.norm_at(&p) * 0.5 + Vector3f::new(0.5);
+
+            return Spectrum::new_rgb(norm.x, norm.y, norm.z);
+        }
+
+        Spectrum::new_rgb(0.0, 0.0, 0.0)
+    }
+}