Fix vec3::reflect. Add tests for vec3::reflect and vec3::is_zero.

1 files changed, 4 insertions, 4 deletions

diff --git a/vec.h b/vec.h
index c7669bf..5050065 100644
--- a/vec.h
+++ b/vec.h
@@ -88,10 +88,10 @@ struct vec3 {
         return *this * (1.0 / norm());
     }
 
-    // Get the reflected vector. Current vector is the incoming vector, n is the normal vector (length should be 1).
-    vec3 reflect(const vec3 &n) const {
-        assert(fabs(n.mod2() - 1.0) < 1e-8);
-        return *this - 2.0 * dot(*this, n) * n;
+    // Get the reflected vector. Current vector is the normal vector (length should be 1), v is the incoming vector.
+    vec3 reflect(const vec3 &v) const {
+        assert(fabs(mod2() - 1.0) < 1e-8);
+        return v - (2.0 * dot(v)) * (*this);
     }
 };