Hey I’ve been working on a rolling ball game as well, and have been running into similar issues. One way I’ve been able to work around the problem is to create a large cube that encompasses the area and use that as the collision - set the in game visibility to hidden, or make a transparent material to apply to several of these collision boxes. Then for you flooring set their collisions to No Collision. Smooth Ride. I know this is an old thread, just thought I’d share what I’ve come up with.