OTOY Forums

Hi Paul,

I feel the same way. No worries, thanks for taking your time looking into this. Curious to see what the guys find

Hi Max

I have heard back from OTOY, and spent a lot of time on this. If I start Rhino and add a sphere and add your HDR file as a Texture Environment, the curves match. But there is something in your scene which is causing the curves to not match. If I start Rhino, add a sphere, add your HDR as a Texture Environment, Standalone and Rhino EXR's curves match. In order to debug this further, I have put together a build where you can select the Force Tone Matching and Premultiplied Alpha settings when saving a multi-layer EXR. I am hoping this will give you enough options to try to isolate the exact issue.

https://render.otoy.com/customerdownloads/plugins/3b/c3/21/84/OctaneRenderForRhino7_2025_2_1_145_STUDIO.rhi

Thanks

Paul