private void initialize(
            final AssetManager assetManager,
            final InputManager inputManager,
            final AudioRenderer audioRenderer,
            final ViewPort viewport) {
        this.assetManager = assetManager;
        this.inputManager = inputManager;
        this.w = viewport.getCamera().getWidth();
        this.h = viewport.getCamera().getHeight();
        this.soundDev = new SoundDeviceJme(assetManager, audioRenderer);
        this.inputSys = new InputSystemJme(inputManager);
    }
Create a standard NiftyJmeDisplay. This uses the old Nifty renderer.
It's probably slower than the batched
renderer and is mainly here for backwards compatibility.

@param assetManager jME AssetManager
@param inputManager jME InputManager
@param audioRenderer jME AudioRenderer
@param vp Viewport to use
@param colorSpace the ColorSpace to use for Nifty colors (sRGB or Linear)
jme3-niftygui/src/main/java/com/jme3/niftygui/NiftyJmeDisplay.java