Can't get Alphas to work

[simon_trapp]

I hope I didn't miss a similar topic.

Basically I want to exclude the domelight and windows from the alpha. I tried setting up object properties but neither alpha contribution of 0/-1 nor setting it to matte surface seems to do anything. Am I doing this wrong or did I miss something?

[deyan.hadzhiev]

Hi simon_trapp, you need to unset the "Affect Alpha" option in the Dome light object and you have to set the "Alpha Contribution" in the object properties for your windows to 0 (with the "Matte Surface" unchecked). Here is a simple example:

[simon_trapp]

Thank you very much for the fast reponse. I missed the setting in the domelight itself.