lighting values cpu versus gpu modes

[Ibear888]

Hello,
The darker of the attached images is a rendering of IES lighting in CPU mode. The brighter is rendered in GPU mode. Both are set to auto EV and other settings are unchanged.

I would not expect to see such a large difference in output between the two modes. (The CPU mode takes takes much longer and does not come to a complete rendering and its lighting evaluation function does not match what is showing in GPU mode).

Any ideas would be appreciated as this is really thwarting my design.
Jeff

[Peter.Chaushev]

Hello, Jeff,
Once again, apologies for the late response! You've mentioned in your other thread the following:

The problem appears related to a combination of the light cache and moving back and forth between final and interactive and CPU/GPU. Restoring to default fixes the issue temporarily.

Has this fixed your issue?
As already mentioned, if you haven't already contacted support@chaosgroup.com , please send over the project for investigation.

Kind regards,
Peter

[Ibear888]

I have learned that restoring to the default does not always fix the issue. The work around appears to be: run the render using settings other than light cache. I'm guessing that for some reason doing so resets the light cache.

I've not sent the project, because i use materials across many files and since I know the materials I don't want to change the names of the materials to make them unique for each file.

[Peter.Chaushev]

Thank you for your reply! We'll look further into this.
If you could create a stripped-down copy of your project with a single light and surface that exhibits the issue and send that scene over, it will help with our investigation. Additionally, please state whether the project is entirely created with V-Ray Next or an older version.

Kind regards,
Peter