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Optix wasn't there when I used the latest version.but when i use 2.6version,it works.
My Graphic card is rtx2070s.
Solved! Go to Solution.
Solved by Stephen.Blair. Go to Solution.
That's because Optix Denoising is now an Imager
https://docs.arnoldrenderer.com/display/A5AFCUG/Imager+Arnold+Denoiser