From 9235e74dfbc41895a5f8807e1ab93508268a39ea Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Wed, 3 Feb 2021 17:54:03 +0100
Subject: Base render of surface normal, and abstract shading and tracing to
 the trace module

---
 src/scene/shapes/sphere.rs | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/scene/shapes/sphere.rs')

diff --git a/src/scene/shapes/sphere.rs b/src/scene/shapes/sphere.rs
index e30c1ec..da7f321 100644
--- a/src/scene/shapes/sphere.rs
+++ b/src/scene/shapes/sphere.rs
@@ -35,6 +35,12 @@ impl Shape for Sphere {
         }
 
     }
+
+    fn norm_at(&self, point: &Vector3f) -> Vector3f {
+        let mut v = *point - self.center;
+        v /= self.radius;
+        v
+    }
 }
 
 #[cfg(test)]
-- 
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