@Override
    public void getRenderSize(Vector2f store) {
        if (!isInitialized()) {
            throw new IllegalStateException("Cannot call getRenderSize() before initialized!");
        }
        store.x = textureW;
        store.y = textureH;
    }
Frame buffers we can draw into.
jme3-vr/src/main/java/com/jme3/input/vr/oculus/OculusVR.java