enhance TestMultiRenderTarget with small animation of light (rotating around 0,0,0 in 3s)

jme3-examples/src/main/java/jme3test/post/TestMultiRenderTarget.java

@@ -44,7 +44,6 @@ import com.jme3.post.SceneProcessor;
 import com.jme3.renderer.RenderManager;
 import com.jme3.renderer.ViewPort;
 import com.jme3.renderer.queue.RenderQueue;
-import com.jme3.scene.Geometry;
 import com.jme3.scene.Node;
 import com.jme3.texture.FrameBuffer;
 import com.jme3.texture.Image.Format;
@@ -55,17 +54,18 @@ public class TestMultiRenderTarget extends SimpleApplication implements ScenePro
 
     private FrameBuffer fb;
     private Texture2D diffuseData, normalData, specularData, depthData;
-    private Geometry sphere;
     private Picture display1, display2, display3, display4;
     
     private Picture display;
     private Material mat;
 
+    private String techOrig;
+    private PointLight[] pls;
+
     public static void main(String[] args){
         TestMultiRenderTarget app = new TestMultiRenderTarget();
         app.start();
     }
-    private String techOrig;
 
     @Override
     public void simpleInitApp() {
@@ -100,18 +100,26 @@ public class TestMultiRenderTarget extends SimpleApplication implements ScenePro
             ColorRGBA.Yellow
         };
 
-        for (int i = 0; i < 3; i++){
+        pls = new PointLight[3];
+        for (int i = 0; i < pls.length; i++){
             PointLight pl = new PointLight();
-            float angle = 0.314159265f * i;
-            pl.setPosition( new Vector3f(FastMath.cos(angle)*2f, 0,
-                                         FastMath.sin(angle)*2f));
-            pl.setColor(colors[i]);
+            pl.setColor(colors[i % colors.length]);
             pl.setRadius(5);
-            rootNode.addLight(pl);
             display.addLight(pl);
+            pls[i] = pl;
         }
     }
 
+    @Override
+    public void simpleUpdate(float tpf) {
+        super.simpleUpdate(tpf);//To change body of generated methods, choose Tools | Templates.
+        for (int i = 0; i < 3; i++){
+            PointLight pl = pls[i];
+            float angle = (float)Math.PI * (i + (timer.getTimeInSeconds() % 6)/3); // 3s for full loop
+            pl.setPosition( new Vector3f(FastMath.cos(angle)*3f, 0,
+                                         FastMath.sin(angle)*3f));
+        }
+    }
     public void initialize(RenderManager rm, ViewPort vp) {
         reshape(vp, vp.getCamera().getWidth(), vp.getCamera().getHeight());
         viewPort.setOutputFrameBuffer(fb);