2 files changed, 7 insertions(+), 4 deletions(-)

M main.ha
M material.ha

@@ 6,8 6,8 @@ use time;
 fn init_scene() *hittable = {
 	let ground = alloc(make_lambertian(&C(0.8, 0.8, 0.0)));
 	let center = alloc(make_lambertian(&C(0.7, 0.3, 0.3)));
-	let left = alloc(make_metal(&C(0.8, 0.8, 0.8)));
-	let right = alloc(make_metal(&C(0.8, 0.6, 0.2)));
+	let left = alloc(make_metal(&C(0.8, 0.8, 0.8), 0.3));
+	let right = alloc(make_metal(&C(0.8, 0.6, 0.2), 1.0));
 	let a = alloc(multi([]));
 	append(a.arr, [
 		alloc(make_sphere(V(0.0, 100.5, -1.0), 100.0, ground)),

@@ 45,11 45,13 @@ fn lambertian_scatter(
 export type metal = struct {
 	material,
 	albedo: color,
+	fuzz: f64,
 };
 
-export fn make_metal(c: *color) metal = metal {
+export fn make_metal(c: *color, fuzz: f64) metal = metal {
 	scatter = &metal_scatter,
 	albedo = *c,
+	fuzz = fuzz,
 };
 
 fn reflect(v: *const vector, n: *const vector) vector =


@@ 63,9 65,10 @@ fn metal_scatter(
 	r_out: *ray
 ) bool = {
 	let m = m: *const metal;
+	let reflected = reflect(&unit(r_in.direction), &rec.normal);
 	*r_out = ray {
 		origin = rec.point,
-		direction = reflect(&unit(r_in.direction), &rec.normal),
+		direction = sum(reflected, scale(random_unit(), m.fuzz)),
 	};
 	*att = m.albedo;
 	return dot(r_out.direction, rec.normal) > 0.0;