- virtual bool has_pass(const Tag &tag) const =0;
- virtual void render(const Tag &tag=Tag()) const =0;
+ virtual ~Renderable() { }
+
+ /** Returns a key used for grouping Renderables in an InstanceScene. */
+ virtual long get_instance_key() const { return 0; }
+
+ virtual void render(const Tag & = Tag()) const;
+ virtual void render(Renderer &, const Tag & = Tag()) const;