how can i project a camera onto a cube as a Texture in jMonkeyEngine 3?

Question

how can i project a camera onto a cube as a Texture in JMonkeyEngine3? would you mind helping me?

I try to do it by this piece of code but it dosent work:

private void addCamera() {
    Camera c = new Camera(100, 100);
    c.setViewPort(0, 1, 0, 1);
    c.setLocation(Vector3f.ZERO);

    ViewPort v = new ViewPort("c", c);
    v.attachScene(rootNode);
    FrameBuffer fb = v.getOutputFrameBuffer();
    fb.setDepthBuffer(Format.Depth);
    Texture2D niftytex = new Texture2D(1024, 768, Format.RGB8);
    fb.setColorTexture(niftytex);

    Box b = new Box(Vector3f.ZERO, 1, 1, 1);
    Geometry geom = new Geometry("Box", b);
    Material mat = new Material(assetManager,     "Common/MatDefs/Misc/Unshaded.j3md");
    mat.setTexture("m_ColorMap", niftytex);
    /**
     * Here comes the texture!
     */
    geom.setMaterial(mat);
    localRootNode.attachChild(geom);

}

Answer 1

If you use the TestRenderToTexture example in the jme3-examples project, you will achieve what you want. You can put the whole thing in a util class and just call it from your project (I've done that myself).