Definitions
Some useful definitions.
- Coplanar – This means that all the vertices of a face lie along the same plane. A method for guarenteeing your faces are always coplanar would be to only use tri’s. However sometimes it is wiser to use a quad (in the production of BSPs with brushs) thus you must be careful that all four verts sit on the same plane
- Convex – This means that all the faces, of the mesh, must point out away from each other.
[...] Brushes must be Convex. [...]