@Override
    protected void postFrame(RenderManager renderManager, ViewPort viewPort, FrameBuffer prevFilterBuffer, FrameBuffer sceneBuffer) {
        if(!shadowRenderer.skipPostPass){
            shadowRenderer.setPostShadowParams();
        }
    }
Get the {@link Material material} used by this filter.
@return the {@link Material material} used by this filter.
jme3-vr/src/main/java/com/jme3/shadow/AbstractShadowFilterVR.java