engine/src/test/jme3test/helloworld/HelloNode.java

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package jme3test.helloworld;

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.Node;
import com.jme3.scene.shape.Box;

/** Sample 2 - How to use nodes as handles to manipulate objects in the scene.
 * You can rotate, translate, and scale objects by manipulating their parent nodes.
 * The Root Node is special: Only what is attached to the Root Node appears in the scene. */
public class HelloNode extends SimpleApplication {

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

    @Override
    public void simpleInitApp() {

        /** create a blue box at coordinates (1,-1,1) */
        Box box1 = new Box( new Vector3f(1,-1,1), 1,1,1);
        Geometry blue = new Geometry("Box", box1);
        Material mat1 = new Material(assetManager, 
                "Common/MatDefs/Misc/Unshaded.j3md");
        mat1.setColor("Color", ColorRGBA.Blue);
        blue.setMaterial(mat1);

        /** create a red box straight above the blue one at (1,3,1) */
        Box box2 = new Box( new Vector3f(1,3,1), 1,1,1);
        Geometry red = new Geometry("Box", box2);
        Material mat2 = new Material(assetManager, 
                "Common/MatDefs/Misc/Unshaded.j3md");
        mat2.setColor("Color", ColorRGBA.Red);
        red.setMaterial(mat2);

        /** Create a pivot node at (0,0,0) and attach it to the root node */
        Node pivot = new Node("pivot");
        rootNode.attachChild(pivot); // put this node in the scene

        /** Attach the two boxes to the *pivot* node. (And transitively to the root node.) */
        pivot.attachChild(blue);
        pivot.attachChild(red);
        /** Rotate the pivot node: Note that both boxes have rotated! */
        pivot.rotate(.4f,.4f,0f);
    }
}