1 files changed, 5 insertions, 3 deletions
diff --git a/src/ShadowVolume.h b/src/ShadowVolume.h
index 81a0a33..445e7ba 100644
--- a/src/ShadowVolume.h
+++ b/src/ShadowVolume.h
@@ -32,15 +32,17 @@ class ShadowVolume {
     ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos);
     virtual ~ShadowVolume() {}
 
-    const vmml::vec3f& getVertex(int i) {
+    const vmml::vec3f& getVertex(int i) const {
       return rays[i].p;
     }
 
-    const vmml::vec3f& getDirection(int i) {
+    const vmml::vec3f& getDirection(int i) const {
       return rays[i].dir;
     }
 
-    void render() const;
+    bool isVisible() const {
+      return visible;
+    }
 
   private:
     bool visible;