[solved] light difference between PT + PT and PT + UHD

[Daniel_Mikolajcak]

Hi guys,
I have had some great time rendering interiors with corona PT+uhd
As I now need to render outside picture with many instances I chose pt+pt. I found out that it is very different and weird than uhd cache. the only change is the secondary engine alle lights and mats are the same.

I would be very greatful for hints.

[Daniel_Mikolajcak]

Ok, i guess i got it solved. The problem seems to have been the artificial cloud i have placed above the concrete tunnel. to throw a soft shadow i have used ambient occlusion as opacity map. I threw this map away und used vertex painting instead and now it works charmingly.