public void setRenderSize(int width, int height) {
        renderWidth = width;
        renderHeight = height;
    }
Set the reflection Texture render size,
set before adding the processor!

@param width the desired width (in pixels, default=512)
@param height the desired height (in pixels, default=512)
jme3-effects/src/main/java/com/jme3/water/SimpleWaterProcessor.java