Call of Duty bo3: Clipping Method1
From COD Modding & Mapping Wiki
Auto model clipping in Radiant
- With your map open in Black Radiant select the clip texture you need in the Textures list
- Select the model you wish to clip
- Go To Select > Make Geo > Generate Clip
You are done!
NOTE: With some models the clip generated might end up having too many faces and could lead to compile failing!
Thanks to Steve @MapperUnited.com for this! link(registration required)