Curves disappear from the Arnold cache when camera is moved

[am_wilkins]

Hi there,

We're doing some instancing of grass blades onto points using the "instancer" node in Solaris.

Everything works fine for all assets, except once we instance curves to points using the instancer then whenever I move the viewport camera in Hydra Arnold loses the grass from the cache (everything else still visible) and requires me to "Restart Render" to get the grass back.

This doesn't happen with Karma.

Seems like a bug?

amwilkins

--

Houdini Core Version 20.0.590
Arnold Core: 7.2.5.2

HotA: 6.2.5.2

CPU: AMD Ryzen TR 3990x

RAM: 128GB
GPU: NVIDIA RTX A4000
OS: Windows

[am_wilkins]

Just to update, it's when anything to do with the grass or camera position is changed or edited.
- Adjusting Colour, etc.
- Scrubbing the timeline with a moving camera or moving a persp camera.

Very frustrating, definitely appears to be a bug here with Arnold not keeping the curves in the cache.

[Stephen.Blair · Accepted solution]

This issue is logged as

HTOA-2504
Curves stop rendering when you change frame or move camera

[am_wilkins]

Okay, thanks Stephen. Always glad when it's not just me. 🙂

Will wait on a fix.

regards,

amwilkins