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Environment lighting results different by cpu and opencl
Posted: Sun Sep 01, 2019 2:53 pm
by frank_yifei
The scene is lit by sky and sun. I tried with only sky or flat colour, the difference is still there. Maybe it is a bug in opencl code.
both rendered 500 samples without any cache or other setting.
opencl
cpu
Re: Environment lighting results different by cpu and opencl
Posted: Sun Sep 01, 2019 3:46 pm
by B.Y.O.B.
Can you upload the scene?
Re: Environment lighting results different by cpu and opencl
Posted: Mon Sep 02, 2019 2:00 am
by frank_yifei
it is a blender 2.8 file.
Re: Environment lighting results different by cpu and opencl
Posted: Mon Sep 02, 2019 9:04 am
by kintuX
You got coplanar faces which are causing an issue. The room floor and the plane (ground) are located at same height (0).
Either move one up/down or cut out a whole from the plane.
Re: Environment lighting results different by cpu and opencl
Posted: Tue Sep 03, 2019 4:05 am
by frank_yifei
ok, thanks, it solved my problem. I just wonder why it is not showing in cpu rendering.
Re: Environment lighting results different by cpu and opencl
Posted: Tue Sep 03, 2019 6:36 am
by B.Y.O.B.
For mysterious reasons, OpenCL engines in LuxCore have more problems with floating point precision than the CPU engines.