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| {{lang|Brush}} | | {{MultiPage}} |
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| A '''brush''' is a [[Wikipedia:Polygon#Convexity and non-convexity|convex]] 3D shape created with [[Hammer]]'s [[Hammer Block Tool|Block Tool]]. Brushes are used by level designers to define the shape of the [[world]] (which defines [[visibility]]) and to create [[brush entity|brush entities]].
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| When a map is compiled [[VBSP]] converts brush faces that touch a [[visleaf]] to [[Wikipedia:Constructive solid geometry|groups of polygons]]. The resulting 'brush models' are stored within the BSP file and can be claimed by entities (e.g. the world, or your brush entity). The original brushes are retained in the BSP, though the benefits of this are not clear.
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| In comparison to [[model]]s, brushes are:
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| * Unique every time
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| * Low-detail and [[cheap]]
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| * Lit with pre-computed [[lightmap]]s
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| * Rigid (cannot [[Skeletal animation|deform]])
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| == Compilation ==
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| # For each individual brush model, only faces that touch a visleaf are compiled. Some of the results of this process can be seen below:
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| [[File:Brushes compiled.png|750px|Brushes and their compiled equivalents]]
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| # If some parts of a brush face touch visleaves and others do not, the face will be chopped up to remove the hidden area.
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| There are two exceptions to these rules:
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| * Although they are discrete entities in Hammer, [[func detail]]s are all merged into one during compile. You do not need to [[nodraw]] hidden 'detail-to-detail' faces in (but you ''do'' need to nodraw world-to-detail and detail-to-world in {{src}}).
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| * Faces with [[$translucent|translucent]] materials applied are never chopped. Don't apply them to internal or hidden surfaces unless you really mean to.
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| == Limits ==
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| VBSP enforces these limits:
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| * 8192 brushes (16384 in {{GMOD}})
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| * 128 faces on a single brush
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| * 32768 faces overall (half of the BSP plane limit, each face uses two planes)
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| Invisible brushes like [[trigger multiple|triggers]] and even [[hint brush]]es count toward the limit. Faces like NODRAW do not count toward the limit. Faces textured with NODRAW are removed during compile, so only its collisions, boundings, and place in the world remain. Note that faces may be split up by the compiler, counting them further toward the limit.
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| {{tip|It is possible to compile a custom build of VBSP with these limits changed or removed, but the engine's behaviour is undefined.}}
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| == See also ==
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| * [[Introduction to Editing]]
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| * [[Basic Construction]]
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| * [[Model]]
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| * [[Displacement]]
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| [[Category:Level Design]] | | [[Category:Level Design]] |
| [[Category:Glossary]] | | [[Category:Glossary]] |
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