iOS Technical Question - Lightmaps, dynamic lighting, drawcalls

[SunSetter]

Are all 3 of those boxes separate objects? if not it will think its concave and convert it to the convex shape you see in udk.
If they are all separate then make sure they are named

UCX_Mesh name_Collision model suffix (this is for fbx)

For example:
UCX_StairStep_1
UCX_StairStep_2
UCX_StairStep_3

assuming your actual mesh name is StairStep

Thank you guys for reply.
I didn't try DGlow solution yet cause I have another question:

Whats the best way(aka performance wise) to set collision for iOS devices? Like the UDK did it or how I did it in 3d max?

[DGlow]

we use navmesh for all the collisions which is pretty good for performance.

epic citadel used a similar solution except with a mesh with per poly collision, which worked for their product.

really depends on your particular project.

You could even optimize your stair collision by making it like a ramp instead of actual steps.