Why can I walk through rocks?

I have added a rock in my UE5 editor and I can walk through it. I am trying to figure out how to fix this issue. I have already tried adding box collisions and nothing happed. How can I fix this?

First thing, is the rock static mesh needs collision, which you do in the static mesh editor ( if it has none ).

Second is, if you’re laying the rocks with the foliage tool, you need to check the collision tickbox. Default is no collision.

Thanks so much! I just have one more question. I can still partially walk through some of it.

It’s likely the collision box (or convex hull) is smaller than the visual rock size.

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