This operator generates repeating filtered ramps. The output is an amount ranging between 0 and 1, representing the filtered area under the ramp. The ramps are 0 at the left edge and 1 at the right edge.
If mirroring of ramps is turned on, the ramps will alternate in slope, forming tent functions.
s input is not specified, a global variable appropriate to the
current context will be used instead, as follows:
s in the shading
contexts; P.x in the geometry and particle contexts; and X in the