VRay Next - Lights render very differently CPU vs GPU rendering

[secretagent214]

I've found that that the way lights render with GPU rendering, CPU rendering, and batch rendering with GPU is very different. If I'm rendering with GPU, the lights render with a very natural looking soft falloff around the edges. However, if I try to render with CPU, or if I start a batch rendering with either GPU or CPU, the lights render with a very sharp falloff that doesn't look natural at all. I've tried IES lights and cone lights with the same results.

The light shown here in the attached images is a 5000 lumen spot light. The first image is a CPU rendering. The second is a batch rendering with GPU. The third image is a GPU rendering. All use the default rendering settings, except that I unchecked max ray intensity and am using auto camera exposure. The difference is visible when Vray is generating the light cache. I'm using Sketchup 2019 Pro and Vray Next. I installed the hotfix released yesterday but still having this issue. This appears to be a bug in Vray Next(never noticed this issue in 3.6)

[Peter.Chaushev]

Hello,
The problem is identified in the V-Ray core. Its ticket has just had its priority raised. It is identical to this one https://forums.chaosgroup.com/forum/...ort-the-insert
We are currently debating on a possible temporary workaround for both V-Ray Next for SketchUp & Rhino. Will post an update in the next days as soon as the solution is deemed solid enough.

Kind regards,
Peter

[Peter.Chaushev]

A fix is currently being devised. It will be available in an upcoming update.
In the meantime, you can overcome this sharp light cut-off by disabling the Camera Auto-exposure, lowering the EV value and then re-enabling the Auto-exposure toggle.
If you encounter any further issues, please do not hesitate to let us know!

Kind regards,
Peter