I still use the old way to relight.
open Terminal type cd [space] drop planeshift folder in push return then type :
./psclient.app/Contents/MacOS/psclient -relight
this will load game when it has loaded depending on area you are relighting, could be long time, quit to save it and quit terminal then start up game as normal.
If you update you will need to do it again.
works well still for me. Hope this helps.

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