How do I make solid objects?

I am trying to put in some stairs so as to have a second and third floor only problem is when I am in play mode I pass through stairs. How do I give them solidness?

Hey cmjames,

It’s likely your stairs don’t have any collision on them. Did you create a static mesh from a bsp brush, or import a mesh without a collision volume? You can check to see if your mesh has collision by opening it in Static Mesh editor and clicking Collision button in toobar. If you don’t see any green lines appear on your mesh, it doesn’t have collision. You can add some by going to Collision menu in Mesh editor and picking one of options there. You’ll probably want to choose auto-convex collision for something like stairs, but there are other options to play around with.

Hope that helps!