This operator generates repeating soft dots. The output is between zero and one, with 1 at the center of the dots and zero at the outside. It can be used to mix between colors or materials.
If the s and t inputs are not specified, global variables appropriate to
the current context will be used instead, as follows: (
t) in the
shading contexts; (P.x,P.y) in the geometry and particle contexts; and
(X,Y) in the compositing context.
The random seed output is only valid if using a single layer.