r.PreventInvalidMaterialConnections
VarUnreal Engine Var console variable.
rPreventInvalidMaterialConnections
Description
Controls whether users can make connections in the material editor if the systedetermines that they may cause compile error 0: Allow all connection 1: Prevent invalid connections
Usage
r.PreventInvalidMaterialConnections [value]Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.

