IsMeshUpdated.java

// Testcase for http://hub.jmonkeyengine.org/t/see-if-a-mesh-has-been-changed/35346/
import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Mesh;
import com.jme3.scene.SceneGraphVisitor;
import com.jme3.scene.Spatial;
import com.jme3.scene.VertexBuffer;
import com.jme3.scene.VertexBuffer.Usage;
import com.jme3.scene.shape.Box;

public class IsMeshUpdated extends SimpleApplication{

	public static void main(String[] args) {
		new IsMeshUpdated().start();
	}

	protected boolean isMeshUpdateNeeded(Mesh m) {
		System.out.println("############# isMeshUpdateNeeded #############");
		for(VertexBuffer b:m.getBufferList()){
			if(b.isUpdateNeeded()&&b.getUsage()!=Usage.CpuOnly){
				System.out.println("VertexBuffer "+b.getBufferType()+" need update. Usage "+b.getUsage());
			}else{
				System.out.println("VertexBuffer "+b.getBufferType()+"  is updated. Usage "+b.getUsage());
			}
		}
		System.out.println("############# /isMeshUpdateNeeded #############");
		return false;
	}

	@Override
	public void simpleInitApp() {
		Box box1=new Box(1,1,1);
		Geometry blue=new Geometry("Box",box1);
		blue.setLocalTranslation(new Vector3f(1,-1,1));
		Material mat1=new Material(assetManager,"Common/MatDefs/Misc/Unshaded.j3md");
		mat1.setColor("Color",ColorRGBA.Blue);
		blue.setMaterial(mat1);
		rootNode.attachChild(blue);
	}
	
	@Override
	public void simpleUpdate(float tpf){
		rootNode.depthFirstTraversal(new SceneGraphVisitor(){
			@Override
			public void visit(Spatial spatial) {
				if(spatial instanceof Geometry){
					Geometry g=(Geometry)spatial;
					isMeshUpdateNeeded(g.getMesh());		
				}
			}			
		});
	}
}