Reality Factory

I'd like to find a game with an editor where I can use the mesh from a modeling program as world geometry with collision detection. Both Unreal and Quake require you to make closed in "solid" boxes. This is not what I want. I want to be able to remove a face so the box will have only 5 sides instead of 6, and the editor not complain about the "hole" in the solid cube. In other words, I want to remove the faces myself instead of the engine doing it, and be able to use single sided triangles in a map, like a modeling program. Lithtech does this, but I was looking for another engine that also does this. I have grown used to making detailed maps this way, and hate to go back to that "blocky" map style. Does anyone know of some editors, games, that use this style? I have downloaded and tried almost every engine at DevMaster that was free, but maybe I missed something... Anyway, I had some time off and tried to find something like this, but never really found anything that was anywhere near what I am used too.

Any suggestions?

theres irrlicht, http://www.irrlicht-engine.com , and ogre3d, http://www.ogre3d.org , but both require programming.

rf can also doit using the staticmesh entity with collision set to the value indicating per-poly (it should say in the docs), but youd have to "bake in" the lighting or settle for ut2004 style vertex lighting.

Thanks Andy

DeleD also has an IRR plugin that let me walk around in the maps!