prior normal check for lights

src/scene/light.rs

@@ -14,6 +14,7 @@ pub enum LightType {
 pub trait Light {
     fn get_light_type(&self) -> LightType;
     fn weighted_distance(&self, pos: Vector3<f32>, size: Vector3<f32>) -> f32;
+    fn get_direction(&self, pos: Vector3<f32>) -> Vector3<f32>;
 }
 
 pub trait LightSource: Light + Memorizable {}
@@ -109,6 +110,10 @@ impl Light for PointLight {
 
         light_intensity / distance.powf(2.0)        
     }
+
+    fn get_direction(&self, pos: Vector3<f32>) -> Vector3<f32> {
+        (pos - self.pos).normalize()
+    }
 }
 
 impl LightSource for PointLight {}
@@ -157,6 +162,10 @@ impl Light for DirectionalLight {
 
         light_intensity
     }
+
+    fn get_direction(&self, pos: Vector3<f32>) -> Vector3<f32> {
+        self.direction.clone().normalize()
+    }
 }
 
 impl LightSource for DirectionalLight {}