Face Tracking CHOP - TensorRT Not Found on TD 2025.32050 with RTX 4080

Bugs
1

Hi all,

I’m experiencing a persistent issue with the Face Tracking CHOP in TouchDesigner 2025.32050. Despite following all recommended installation steps, I keep getting the error:

”TensorRT not found. Ensure the AR SDK for your GPU is installed.”

Here’s what I’ve done so far:

  • GPU: NVIDIA RTX 4080

  • TouchDesigner build: 2025.32050 (latest)

  • NVIDIA AR SDK: downloaded and installed the correct version (0.8.2 GA for RTX 40 series)

  • TensorRT: downloaded and installed 8.6 GA (CUDA 11.x)

  • Verified the DLLs exist in the TensorRT lib folder (nvinfer.dll, nvinfer_plugin.dll, nvonnxparser.dll)

  • Copied those DLLs into the TouchDesigner bin folder as suggested

  • Microsoft Visual C++ 2015–2022 x64 redistributables installed

  • Studio drivers and Windows up to date

Despite all this, TouchDesigner still reports that TensorRT is not found, and the Face Tracking CHOP does not work.

Has anyone else encountered this issue? Are there additional steps I might be missing, or could this be a bug with the Face Tracking CHOP in this build? Any advice or insights would be greatly appreciated.

Thanks in advance!
Jaime

Screenshot 2025-12-28 164308
Screenshot 2025-12-28 1643082540×1101 221 KB

2

Hi @phattie_j

Can you try using the 0.8.7 version of the NVIDIA AR SDK? That’s the version of the AR SDK we support. We’ll update the wiki to clarify the version requirements. Sorry for the inconvenience.

Note that TensorRT is bundled with the AR SDK, so you won’t need to go through extra steps to install TensorRT and copying DLLs over. You should be able to use the NVIDIA AR SDK as it is.

3

Hi @daniel.k Thanks a lot! that got it to work

4

I installed the 0.8.7 for the 40 series cards and I’m still having problems. I may have mistakenly installed newer version of Nvidia AR SDK before I come across this bug fix. Any other things I can try? I don’t see an installer for the SDK to remove other versions.

6

Hey @yonespro

You can check which version of the AR SDK you’ve installed by going to your Settings > Apps > Installed Apps.

Also, make sure your GPU drivers are up-to-date.

8

EDIT: Solved it, I needed the video SDK, not the AR.

Thanks for confirming it should show in my installed apps.
Found it, 0.8.7, running TD 2025.32820. Nvidia app says studio driver up to date, along with all other device/OS updates.
Uninstalled 0.8.7 and reinstalled “as admin…”, restarted between steps, still TD shows:
Error: TensorRT is not found

Any thoughts? FYI its a 4080 in Asus laptop.

9

Hey @yonespro

Glad to hear it’s working for you now. Thanks for letting me know.

I just want to clarify that the Face Track CHOP should use the AR SDK. Were you using a different operator?