add Metal material

2021-05-11 22:52:51 +02:00 · 2021-05-11 22:52:51 +02:00 · bc3fb54991
commit bc3fb54991
parent b3c47a914f
3 changed files with 45 additions and 11 deletions
--- a/in_one_weekend/src/vec3.zig
+++ b/in_one_weekend/src/vec3.zig
@ -78,6 +78,10 @@ pub const Vec3 = packed struct {
            and math.absFloat(self.y) < t
            and math.absFloat(self.z) < t;
    }
+
+    pub fn reflect(self: Vec3, n: Vec3) Vec3 {
+        return self.sub(n.mul_s(self.dot(n) * 2));
+    }
 };

 pub fn random(rng: *Random, min: f32, max: f32) Vec3 {