2 pointsAnother method, which is dependent on what kind of objects you have, is to iteratively use the ray sop set to minDist with a low value and then blur inside a sop solver. See attached scene: blend_pos_yader.hiplc
1 pointI think your assumption is right. It looks like it is a divisor deciding whether or not to reseed on a any given frame. If you set it to 5, the reseed will only happen every 5 frames is my guess.