@Override
    protected void postFrame(RenderManager renderManager, ViewPort viewPort, FrameBuffer prevFilterBuffer, FrameBuffer sceneBuffer) {
        renderManager.setCamera(viewPort.getCamera(), false);
        if (prevFilterBuffer != sceneBuffer) {
            renderManager.getRenderer().copyFrameBuffer(prevFilterBuffer, sceneBuffer, true, false);
        }
        renderManager.getRenderer().setFrameBuffer(sceneBuffer);
        viewPort.getQueue().renderQueue(RenderQueue.Bucket.Translucent, renderManager, viewPort.getCamera());
    }
Override this method and return true if your Filter needs the scene texture
@return false
jme3-effects/src/main/java/com/jme3/post/filters/TranslucentBucketFilter.java