Physics/Cloth passing through collision Object?

Why is the cloth simulation going through the collision object (the pants and self collision are enabled)?


Any suggestion to fix this issue? Thanks

Have you tried adjusting the Object Collision distance? Also, if all else fails, duplicate the Collision area, scale it a little larger, make it invisible and non-renderable, and use that for your collisions.

Doesn’t it collide at all, or just intersects a small distance?

If it is the former, it would be easier figured out with a blend file. If it is the latter, what @markholley said, and also you may want to subdivide a little bit finer. It makes sense to keep the sim mesh coarse, but a bit smaller faces could help with intersections, as only the vertices collide.