Shadows and lights dissapearing at render

**D5 Render Version: 1.8.1
**Graphics Card: Gtx 1080
**Driver Version: 10.0.18362.1049
**Issue Description: Hello at the live preview in medium quality i see some nice shadows and lights but at the export or at high quality preview they dissapear why?

Hello @aleo13 ,
The medium quality preview is an intermediate effect.
Taking into account the preview efficiency, we will sacrifice some details when there is no rtx accelerated.

thank you Whao so i have to buy an RTX videocard?

The RTX card will have a better experience and faster real-time preview, but in terms of rendering results, GTX and RTX are the same.