diff options
| -rw-r--r-- | src/main.zig | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/main.zig b/src/main.zig index bbcc5ea..fe66186 100644 --- a/src/main.zig +++ b/src/main.zig @@ -166,11 +166,12 @@ const DiffuseMaterial = struct { const MetalMaterial = struct { albedo: Color, + fuzz: f64, fn scatter(mat: MetalMaterial, r_in: Ray, record: HitRecord, attenuation: *Color, scattered: *Ray, rand: std.rand.Random) bool { - _ = rand; + debug.assert(mat.fuzz <= 1.0); const reflected = reflect(r_in.dir.normalized(), record.normal); - scattered.* = Ray{ .origin = record.p, .dir = reflected }; + scattered.* = Ray{ .origin = record.p, .dir = reflected.add(randomPointInUnitSphere(rand).mul(mat.fuzz)) }; attenuation.* = mat.albedo; return reflected.dot(record.normal) > 0.0; } @@ -361,8 +362,8 @@ pub fn main() !void { // World const material_ground = Material{ .diffuse = DiffuseMaterial{ .albedo = Color{ .x = 0.8, .y = 0.8, .z = 0.0 } } }; const material_center = Material{ .diffuse = DiffuseMaterial{ .albedo = Color{ .x = 0.7, .y = 0.3, .z = 0.3 } } }; - const material_left = Material{ .metal = MetalMaterial{ .albedo = Color{ .x = 0.8, .y = 0.8, .z = 0.8 } } }; - const material_right = Material{ .metal = MetalMaterial{ .albedo = Color{ .x = 0.8, .y = 0.6, .z = 0.2 } } }; + const material_left = Material{ .metal = MetalMaterial{ .albedo = Color{ .x = 0.8, .y = 0.8, .z = 0.8 }, .fuzz = 0.3 } }; + const material_right = Material{ .metal = MetalMaterial{ .albedo = Color{ .x = 0.8, .y = 0.6, .z = 0.2 }, .fuzz = 1.0 } }; const sphere1 = Hittable{ .sphere = Sphere{ .center = Point3{ .x = 0.0, .y = -100.5, .z = -1.0 }, .radius = 100.0, .material = &material_ground } }; const sphere2 = Hittable{ .sphere = Sphere{ .center = Point3{ .x = 0.0, .y = 0.0, .z = -1.0 }, .radius = 0.5, .material = &material_center } }; const sphere3 = Hittable{ .sphere = Sphere{ .center = Point3{ .x = -1.0, .y = 0.0, .z = -1.0 }, .radius = 0.5, .material = &material_left } }; |