Optix denoiser not working

[zackNBY5B]

I get this error when trying to render with optix.

ERROR| [gpu] OptiX was not found

Nvidia driver version: 416.34

Version: C4DtoA 2.4.2.1 Arnold core 5.2.1.0

I have a GTX TITAN X and a GTX 970.

[Stephen.Blair]

Try adding the arnold\bin folder to the PATH

[zackNBY5B]

@Stephen Blair I'm assuming you mean adding an environment variable. I tried added that but still getting the same error

[peter.horvath6V6K3]

Is this in R20? There's a known issue, that the optix denoiser is not working in R20, because of a dll loading problem. The fix is coming in the next release. Actually adding the Arnold bin folder to the PATH env var, like Stephen suggested should work as a workaround.

[Anonymous]

How to add to env var? please write a eg.

[peter.horvath6V6K3]

Here's how you set environment variables on Windows:

https://www.computerhope.com/issues/ch000549.htm

You have to add

c:\Program Files\MAXON\Cinema 4D R20\plugins\C4DtoA\arnold\bin to the PATH variable. So it should look like this:

c:\Program Files\MAXON\Cinema 4D R20\plugins\C4DtoA\arnold\bin;my other folder1;my other folder2;...

Check this for OSX:

http://www.ntu.edu.sg/home/ehchua/programming/howto/environment_variables.html

Don't forget to remove this when the bug is finally fixed.

[Peacemaker69]

Sorry, how to add a PATH to be able to select the OptiX ??

Can someone write step by step tutorial ?

[peter.horvath6V6K3]

I've got a fix, please check this build and let me know if it does not work for you.

https://safeshare.solidangle.com/index.php/s/5fIqC2gvWub0RiU

password: T43y5f