Bmodel
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A bmodel (short for brush model) is a model made out of BSP brushes. These are normally called from within the currently loaded BSP map file. Each bmodel uses its own BSP tree; there is a bmodel for worldspawn, as well as bmodels for each brush entity.
With the exception of the bmodel used by worldspawn, are called from an entity using
- in the model KV, wherein # is a number representing the location of the bmodel in the BSP file. Worldspawn always uses bmodel 0.
- In
Quake and 
GoldSrc, any entity can use bmodels from a separate BSP file from the currently loaded map. If a bmodel is loaded from a separate BSP separate, the worldspawn bmodel will be used. 
Note:All point entities can use MDLs, SPRs, and separate BSP models interchangeably.
Important:Bmodels contained in separate BSPs are usually fullbright, because they cannot inherit lighting info from the world.
Tip:Use ericw-tools and compile with -dirtdebug to apply some generic ambient occlusion to the standalone BSP model's lightmaps, improving visibility.- In
Source, only bmodels built into the current map can be used.[confirm]