Constructive Solid Geometry, or CSG, is a type of 3D Soft Modeling that is commonly used in SoE: TFS and ROBLOX.
No longer causes lag during loading.
It's used to make models and shapes that look professional and complex, but in reality it just lets the designer make a simple model or shape that just LOOKS complex.
Using Boolean Operators, you can use CSG to make very complex and cool looking objects or models on ROBLOX.
CSG & SoE: TFS
A lot of the guns in SoE: TFS use CSG soft modeling, and you can easily tell which ones because of how nice and cool they look, or how they're not affected by Lag.