Flat Colored Meshes

I've created a mesh and positioned it in my world. It does collision checking correctly and I can move all around it with my camera. All of that works well. However, no matter what I try, I cannot get the mesh to appear solid. It always appears flat, giving no indication of the various vertices and faces/triangles. All the faces are displayed correctly (meaning I can see them) but there is no difference in light or shadow anywhere on the mesh.

I've tried everything I can think of, including adding and removing ambient light, dynamic lights, using a texture and vertex lighting. Nothing changes. I've added other primitives, like a cube and a cone, and those are lit correctly and display as actual 3D objects.

Any ideas...?

The normals probably aren't set correctly for your mesh. Try UpdateNormals.

That did the trick!
Thanks!

Glad to help, but if at all possible have the normals set correctly in the mesh to begin with. UpdateNormals can be a slow command sometimes so avoid it if possible. I'm rather curious where you got a model without correct normals. Where did the model come from/what software was it created in, and what file format?

Actually, I'm creating it myself on-the-fly.
It's a randomly generated "wall" that I'm putting up around the player's area. Each time it's unique, which is what I want. Unless I regenerate the wall, I only have to use UpdateNormals once after I create the wall. Now all I have to do is get the texturing right and it will be perfect.