Concave: Difference between revisions

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Concave simply means curving inward or hollow at one side. If a brush was concave a straight line to enter and exit the shape two or more times. This can only happen when brushes are concave (the opposite of concave is convex). Concave brushes are not allowed in the BSP format. Hammer and the compile tools will report concave brushes so you can repair them (by [[Reshaping Solids|reshaping solids]]) if your map is still open. However, Hammer will not be able to load concave brushes from a saved map with, if Hammer cannot fix them when the map is loaded, they will be ignored.
{{Underlinked|date=January 2024}}
{{lang|Concave}}
A '''concave''' brush is any brush that is not convex. If a brush is convex, then any imaginary line you could draw from one vertex to another will never be outside the brush. Therefore, if such a line can be drawn, the brush is concave. To put it another way, a brush is concave if any of its vertices sticks inward instead of outward.


[[image:Concave example.JPG]]
Concave brushes are not allowed in the BSP format. Hammer and the compile tools will report concave brushes so you can repair them (by [[reshaping solids]]) if your map is still open.  However, Hammer will not be able to load concave brushes from a saved map. If Hammer cannot fix them when the map is opened, they will be ignored.
 
[[File:Concave example.JPG]]


Note how the left and middle brushes are convex (legal) while the right brush is concave (illegal).
Note how the left and middle brushes are convex (legal) while the right brush is concave (illegal).
== External links ==
* [http://www.vadear.com/koko/?p=220 Concave objects (Vadear.com)]
* [[Wikipedia: Convex and concave polygons]]


[[Category:Glossary]]
[[Category:Glossary]]
==External Links==
*[http://www.vadear.com/koko/?p=220 Concave objects (Vadear.com)]
*[http://en.wikipedia.org/wiki/Convex_and_concave_polygons Convex and concave polygons (Wikipedia)]

Latest revision as of 15:03, 7 January 2024

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A concave brush is any brush that is not convex. If a brush is convex, then any imaginary line you could draw from one vertex to another will never be outside the brush. Therefore, if such a line can be drawn, the brush is concave. To put it another way, a brush is concave if any of its vertices sticks inward instead of outward.

Concave brushes are not allowed in the BSP format. Hammer and the compile tools will report concave brushes so you can repair them (by reshaping solids) if your map is still open. However, Hammer will not be able to load concave brushes from a saved map. If Hammer cannot fix them when the map is opened, they will be ignored.

Concave example.JPG

Note how the left and middle brushes are convex (legal) while the right brush is concave (illegal).

External links