Add lambertian and metallic materials

1 files changed, 14 insertions, 0 deletions

diff --git a/src/metal.cpp b/src/metal.cpp
new file mode 100644
index 0000000..d02a2f7
--- /dev/null
+++ b/src/metal.cpp
@@ -0,0 +1,14 @@
+#include "metal.hpp"
+#include "hittable.hpp"
+#include "vec3.hpp"
+
+metal::metal(const color& albedo, double f)
+    : albedo(albedo), fuzz(f < 1 ? f : 1) {}
+
+bool metal::scatter(const ray& r, const struct hit_info& info, color& attenuation, ray& scattered) const {
+    auto reflected = reflect(r.direction, info.normal).unit();
+
+    scattered = ray { info.point, reflected + fuzz * random_in_unit_sphere() };
+    attenuation = albedo;
+    return (scattered.direction.dot(info.normal) > 0.0);
+}