Func detail
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mat_wireframe screenshot of two cylinders. Left is a world brush, and causes bad triangles; right is a detail brush and causes no problems.
The same scene examined in glview. The world brush butchers the BSP, while the detail brush does nothing.
func_detail is an internal brush entity that does not affect visibility or cause other brushes to be sliced - in other words that does not affect the structure of the rest of the map. It should be used on all brushwork that does not form the 'backbone' of a map (and that is not already tied to an entity).
Valve provide an example map at sourcesdk_content\hl2\mapsrc\sdk_func_detail.vmf.
Caveats
- Detail brushes cannot be used to seal a map.
- Because detail brushes do not slice other brushes, light can seep underneath them if the other surface's lightmap scale is larger than the detail brush is wide/tall. If you encounter this, manually create a slice in the underlying brush (Shift+X).
- This effect can cause detail brushes with lots of surface contact to become inefficient, because the surface beneath them is being rendered too!
- Detail brushes will slice brushes when they intersect with them. Todo: Confirm in OB.
- Surfaces on very thin (about 2 units thick) detail brushes have been known to disappear at certain distances. As a workaround, use func_brush instead.
- Brushes with translucent materials applied will automatically become detail.
Good candidates
- Pillars, plinths and supports
- Free-standing walls
- Suspended walkways
- Stairs (create a smooth wedge-shaped brush underneath)
- Small buildings
- Rotated brushes
See also
(These duping pages should really be merged into this one.)
- Controlling Geometry Visibility and Compile Times - Detail brushes
- See also BSP Map Optimization - Detail Brushes
- See also Optimization (Geometry) - Detail brushes
Keyvalues
(You'll probably never need to change these.)