Func detail
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Entity Description
Like all brush entities, func_details do not contribute to visibility calculations. However unlike other entities, func_details do not retain any actual entity data after a compile, and therefore are similar to world brushes in every other respect - they are solid (unless materials specify otherwise) and block light just like a normal world brush. Thus, they are ideal for optimizing "visual detail" brushes like columns, debris, fences, or even small buildings.
On where to use func_details, see BSP Map Optimization - Detail Brushes.