Help Needed: "Open VKL internal error 'encountered unknown cell type'" in OSPRay Studio Demo

[zhanjun717]

Hi everyone,

I’m currently working with OSPRay Studio and trying to run the unstructured_volume demo. However, I encountered the following error during execution:

OSPRay error: Open VKL internal error 'encountered unknown cell type'

This error seems to be related to some unknown cell type in the volume data, but I’m not sure how to resolve it. Has anyone encountered this issue before or can point me in the right direction to fix it?

Here’s what I’ve tried so far:

• I’ve made sure that the demo code and dependencies are properly set up.
• I’ve double-checked the volume data format for any discrepancies.
• I tried running other demos, and they work fine, but this specific one is causing the issue.

Any help or suggestions would be greatly appreciated!

Thanks in advance!

[johguenther]

Thank you for this detailed bugreport! I can reproduce it, only happens on Windows, yet the unstructured_volume scene in ospExamples.exe also works. Quite bizarre, you never stop learning: turns out, that MSVC does not update the __cplusplus macro per default, neither does CMake, leading Studio to use the wrong datatype for cell.type...