Good evening,
I am not sure how active this section of the forum is, but I have a question regarding accelerad. I have been using this for years, and specifically the AcceleradRT functionality.
Recently I bought myself a new PC that has an RTX5080 and to my surprise acceleradRT cannot run as I get an optiX error (acceleradrt: internal - Error reading OptiX library. Update your graphics driver.)
What I read online is that newer card and specificially their latest drivers have stopped support for older OptiX versions. Is there any way to fix this on my end without the need to install really old drivers to a new card?
Welcome to the Radiance forum. The short answer is no. You will need to roll back to driver version 581 or earlier to use Accelerad, as the newer versions no longer support OptiX 6.
good to see you here and I really appreciate you replying so quickly. According to my account page I have been part of the forum for 6 years, but I guess I am a lurker .
I will continue using my old laptop then for Accelerad. Was so excited to try my new GPU out. I am not sure I want to roll that far back as it miht break functionalities on other software I am using.
p.s.: As a user of accelerad for many year, I am always grateful for the work you have done!
Hi,
the latest 581 driver is from November 2025 so you likely do not risk anything by going back to it, the 590 branch is still pretty recent.
@Nathaniel_Jones,
I am currently working on port of Accelerad to Optix 7 with the help of OWL to make it usable with modern drivers and also get a better understanding of how you built it in the first place.
I will report back once I got the differences to Accelerad small enough that it warrants releasing it.
Very cool. I can see that the pixel jitter and source sampling are set differently between the three three renders. For validation, it would be useful to see the settings for each render. Are you using irradiance caching? That was the tricky to port to Accelerad because irradiance caching is serial by nature.
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