🖌️ Add materials

1 files changed, 33 insertions, 0 deletions

diff --git a/racer-tracer/src/material/lambertian.rs b/racer-tracer/src/material/lambertian.rs
new file mode 100644
index 0000000..8356685
--- /dev/null
+++ b/racer-tracer/src/material/lambertian.rs
@@ -0,0 +1,33 @@
+use crate::{
+    material::Material,
+    ray::Ray,
+    vec3::{random_unit_vector, Color, Vec3},
+};
+
+pub struct Lambertian {
+    color: Color,
+}
+
+impl Lambertian {
+    pub fn new(color: Color) -> Self {
+        Self { color }
+    }
+}
+
+impl Material for Lambertian {
+    fn scatter(
+        &self,
+        ray: &crate::ray::Ray,
+        rec: &crate::geometry::HitRecord,
+    ) -> Option<(Ray, Color)> {
+        let mut scatter_direction = rec.normal + random_unit_vector();
+
+        // Catch bad scatter direction
+        if scatter_direction.near_zero() {
+            scatter_direction = rec.normal;
+        }
+
+        let scattered = Ray::new(rec.point, scatter_direction);
+        Some((scattered, self.color))
+    }
+}