Merge pull request #158 from JamesTKhan/cull-optimization

Reduce cull check matrix calcs

commons/src/main/com/mbrlabs/mundus/commons/scene3d/components/CullableComponent.java

@@ -47,12 +47,16 @@
 public abstract class CullableComponent extends AbstractComponent implements ModelEventable {
     private final static BoundingBox tmpBounds = new BoundingBox();
     private final static Vector3 tmpScale = new Vector3();
+    private final static short frameCullCheckInterval = 15;
     private static DirectionalLight directionalLight;
 
     protected final Vector3 center = new Vector3();
     protected final Vector3 dimensions = new Vector3();
     protected float radius;
 
+    // Render calls since last cull check
+    protected short framesSinceLastCullCheck = 0;
+
     // Is it offscreen?
     protected boolean isCulled = false;
     private Array<Event> events;
@@ -78,9 +82,15 @@ public void render(float delta) {
         if (this instanceof ModelCacheable) {
             if (((ModelCacheable) this).shouldCache()) {
                 isCulled = false;
+                return;
             }
         }
 
+        // If object is not culled, don't perform a cull check every frame, just in intervals
+        // to reduce matrix calculations
+        if (!isCulled && framesSinceLastCullCheck++ < frameCullCheckInterval) return;
+        framesSinceLastCullCheck = 0;
+
         boolean visibleToPerspective;
         boolean visibleToShadowMap = false;