combine.setSource1Intensity( 0f );
combine.setSource2Intensity( 1f );
combine.setSource1Saturation( 0f );
combine.setSource2Saturation( 1f );
vignette = new Vignette( vpW, vpH, false );
// add them to the postprocessor
postProcessor.addEffect( curvature );
postProcessor.addEffect( zoomer );
postProcessor.addEffect( vignette );