I've researched topics all over this site, and I think it's possible but I'd like to ask the experts. Is it actually possible to import a building or part of a building (like a dome or circus tent) as a prop, so long as one takes care to construct the collision mesh properly? I'm building a Control Point map, and this is one of the team bases (currently solid models in Rhino to work out layout and shapes before they are built in Max): The visual theme of this map (and two others in the works) is that of 1960's "Googie" architecture and the science-fiction art design of Forbidden Planet and the original Star Trek (both of which are echoed in the Spytech props already in TF2.) Specifically, I'm drawing a lot of buildings and themes from the 1964 New York World's Fair. This particular building is the Travelers Insurance Pavilion, which I'm currently roughing out the collision mesh for. As explored in another thread here, props can't be made with concave shapes. I'm instead using planar trapezoids to construct the top dome's collision mesh, at least to see what I'll have to make in Max when I'm happy with everything. Does anyone know of maps that have used props in this manner, or am I exploring a new frontier or a dead end? I'm learning Hammer, but I feel like it's damn near impossible for me to build that kind of shape with Hammer's toolset.