I have a rather huge scene. So I created rather big grass patches - about 2m in radius. A single image looks fine, but when I am rendering animations it seems, that the gras is kinda floating or rotating or more or less facing to the camera. I never had that before! First I thought it's because of VrayDisplacement. By turning it of, it didn't solve the problem. Anyone an idea, whats going on?
Attached a sample render file.