ft: ran linter

src/vec3.rs

@@ -83,7 +83,7 @@ impl Vec3 {
     }
 
     pub fn length_squared(&self) -> f32 {
-        (self.x * self.x + self.y * self.y + self.z * self.z) as f32
+        self.x * self.x + self.y * self.y + self.z * self.z
     }
 
     pub fn dot(&self, other: &Self) -> f32 {
@@ -123,7 +123,7 @@ impl Vec3 {
         let r_out_perp = etai_over_etat * (*self + cos_theta * n);
         let r_out_parr = -sqrt((1. - r_out_perp.length_squared()).abs()) * n;
 
-        return r_out_perp + r_out_parr;
+        r_out_perp + r_out_parr
     }
 
     pub fn output(self) -> image::Rgb<u8> {