@Override
    protected void cleanup(Application app) {
        this.backGroundColor = null;

        for (final FrameBuffer frameBuffer : framebuffers) {
            frameBuffer.dispose();
        }

        for (final Image image : images) {
            if (image != null) {
                image.dispose();
            }
        }
    }
Test whether this EnvironmentCamera is busy. Avoid reconfiguring while
busy!

@return true if busy, otherwise false
jme3-core/src/main/java/com/jme3/environment/EnvironmentCamera.java