From ZDoom Wiki
|Warning: This feature does not work in ZDoom but in its OpenGL children ports.|
|Warning: The feature described on this page is only there for compatibility purposes with Vavoom and will not be extended or maintained beyond this point. It is therefore recommended to look for equivalent ZDoom method to achieve the same effects instead of using this feature.|
161:Sector_SetContents (type, translucency, flags)
This function is left undocumented at Graf Zahl's request.