The radial shader, like the vortex warp shader, simple shape shader, and others, is position based, and radius based. It effects colour/displacement. There are too flavors, push and pull. The effects are pretty much the same as the lean shader, but effecting color as well, and in a radial fashion.
Primary Use: Clouds and lighting are improving in such radical way that realistic explosions/implosions and many other effects are possible.