render.GetMorphTex0
Description
This is used internally - although you're able to use it you probably shouldn't.
You probably want to just use a custom render target. See GetRenderTargetEx.
Returns the first render target texture that was used internally for Morph post processing effect
The post processing effect was removed from the base game at some point during development of Garry's Mod 13, but can still be found as a community mod: https://steamcommunity.com/sharedfiles/filedetails/?id=501088470