This issue is mentioned in another post related to vRay, but I'm using MAX 2016 SP4 and mental ray, and FP 5.4.1, so thought I'd start a new thread. I have a camera circling over a field including a patch of mulch, a patch of grass and scattered leaves. The mulch object renders fine, the leaves render fine, but the individual grass objects in the grass FP object flicker off and on. Not all grass object flicker on and off. They flicker off and on in specific areas, where the grass meets the mulch. I have the mulch setup as an "exclude" object for the grass, so the grass doesn't come up through the mulch. Any ideas on a solution?