V-Ray GPU (RTX) IPR crash with Phoenix FD in Camera view

V-Ray V-Ray GPU Issues
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1

I am experiencing a reproducible 3ds Max crash when running V-Ray GPU IPR in RTX mode with a Phoenix FD simulation. The crash occurs specifically when rendering from a Camera V-Ray.

Observations & Troubleshooting:

  • Camera View Crash: Starting IPR from any Camera view causes 3ds Max to crash to the desktop.

  • Motion Blur Ruled Out: I initially suspected motion blur was the cause, but disabling it completely in the camera settings did not resolve the issue.

  • Perspective View Workaround: If I switch the active viewport to Perspective mode, the IPR renders perfectly fine and does not crash.

Technical Details:

  • Hardware: Intel Core i7-14700KF, Nvidia GeForce RTX 5070

  • Crash Module: cuMemcpyHtoDAsync_v2 failure in nvcuda64.dll (Access Violation) during OptiX BVH update.

  • Version V-Ray: 7.4 DR2. Phoenix FD: 5.25.00.

  • Driver nvidia: 610.62 as recommended by V-Ray.

Attachments Provided:

  1. The 3ds Max scene file. Vray GPU RTX PhoenixFd Crash - Google Drive

  2. The associated Phoenix FD cache files.

  3. The 3ds Max crash dump reports.

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3

Hi,

Thank you for all the details.

I was able to reproduce the issue on my side.
We will investigate it further and provide an update.

4

Hi Max,

The crash seems to be related to the Phoenix expressions and particle tuner.
Removing them resolves the issue: https://drive.google.com/file/d/1OL0h1ztaonbgBYU_zNw6aiTqqPDQCOTg/view?usp=drivesdk

Unfortunately, because Phoenix is now end-of-support,
we are unable to provide bug fixes for it.