fx: sphere hit calculation sometimes picking wrong isct point

src/vec3.rs

@@ -102,7 +102,7 @@ impl Vec3 {
     }
 
     pub fn reflect(&self, n: &Self) -> Self {
-        *self - 2. * self.dot(n) * n
+        *self - 2. * (self.dot(n) * n)
     }
 
     pub fn refract(&self, n: &Self, etai_over_etat: f32) -> Self {