$checkuv
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Important:$checkuv appears to affect meshes provided through any QC commands that accept meshes, including those whose meshes do not typically contain any form of comprehensive UV mapping (such as $collisionmodel). Depending on the $checkuv commands issued, this may cause model compilation to fail when said behavior would be otherwise undesired.
Note:gutter does not function as it has not been implemented
$checkuv is a QC command available in all 
Source games since 
Source 2013. It checks the UVs of meshes and prints out messages if the checks fail.
Important:$checkuv appears to affect meshes provided through any QC commands that accept meshes, including those whose meshes do not typically contain any form of comprehensive UV mapping (such as $collisionmodel). Depending on the $checkuv commands issued, this may cause model compilation to fail when said behavior would be otherwise undesired.Syntax
$checkuv <0to1> <overlap> <inverse> <gutter [res] [min]>
- 0to1
- Checks that all UVs are in the [0, 1] range
- overlap
- Checks that all polygons in UV do not overlap
- inverse
- Check that all polygons in UV have the correct winding, i.e. the cross product of edge AB x BC points the right direction
- gutter
- Checks that the distance between edges in UV islands is a minimum number of pixels for a given texture size
Note:gutter does not function as it has not been implemented