@Nate
Thanks a lot ! I put the ToonShading.usf file you link in the “engine/shader” folder.
From now, I can resume my “narrative playthrought” :
… launch the editor (Debug -> Start new instance)
the splash screen of the editor is showing.
at 45 %, it’s stuck for a looong time while it compile all the shaders (I imagine it’s normal and happens only the first time I launch the new version of the editor).
at 95 %, UE4 triggers a breakpoint (I continue anyway…), 2 times and crash.
here’s the new errors :
(Full log in attachments).
I found the ConsoleVariables.ini and uncomment the line : r.ShaderDevelopmentMode=1, as suggest by the log.
Now, when the editor is loading, at 95 %, a big windows named “error” opens with the same 40 shader compiler errors.
In that case, UE4 editor doesn’t crash but get stuck at 95 %. The only one process consuming processor resource is something called “ScriptedSandbox64.exe”