SMODE

Here are the different types of shape that are supported by blur modifiers. These shapes are configurable in the Parameters editor:

Gaussian Blur set as "Normal" Blending mode with varying luminosity threshold	Gaussian Blur set as "Screen" Blending mode with varying luminosity threshold	Gaussian in "Normal" Blending mode and cycle through all aggregator types
Box Blur	Circle Blur	Ring Blur
Hexagonal Blue	Hexagonal Blur in "Screen" mode with "Maximum" aggregator type and varying luminosity threshold	Zoom Blur
Spin Blur	Directional Blur	4 Star Blur
8 Star Blur	Random Box Blur	Random Circle Blur
Random Triangle Blur	Random Triangle with "Smoothing" parameter variation	Diffuse Blur
Custom : Multi-Pass algorithm with 2 directional blur (one still and one rotating)	Custom : Combine algorithm with 2 directional blur (one still and one rotating)