material

1 files changed, 18 insertions, 0 deletions

diff --git a/src/calculus.rs b/src/calculus.rs
index e1e9caf..568eb60 100644
--- a/src/calculus.rs
+++ b/src/calculus.rs
@@ -105,6 +105,20 @@ pub mod calculus {
                 z: self.z / mag,
             }
         }
+
+        pub fn is_near_zero(&self) -> bool {
+            self.x.abs() < f32::EPSILON &&
+                self.y.abs() < f32::EPSILON &&
+                self.z.abs() < f32::EPSILON
+        }
+
+        pub fn reflect(&self, normal: &Self) -> Self {
+            self.sub(
+                &normal.scalar_mul(
+                    2.0 * self.dot_prod(&normal)
+                )
+            )
+        }
     }
 
     pub struct Ray {
@@ -117,6 +131,10 @@ pub mod calculus {
             // Get parametric location
             self.origin.add(&self.direction.scalar_mul(t))
         }
+
+        pub fn reflect(&self, normal: &Vec3) -> Vec3 {
+            self.direction.reflect(&normal)
+        }
     }
 
     pub fn deg2rad(deg: f32) -> f32 {