if set to true the GaussianBlurPostProcess will render the vertical pass; otherwise a horizontal pass is rendered.
blurStandardDeviationSingle (Optional)
blur standard deviation (default value is 2)
filterSizeInt32 (Optional)
number of pixels to read to produce the blurred color (possible values: 5, 7, 9, 11, 13, 15; 15 by default). When using smaller filer size, the blurStandardDeviation also needs to be reduced (for example use 0.5 for filterSize=5)