$checkuv

$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