Operating system: Linux-5.4.45-050445-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.36.06
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-29 16:20, hash: rB5d31ef082057
Short description of error
A FLIP fluid mesh no renders with motion blur in Cycles (despite the "Use Speed Vectors" option is checked) when OpenVDB cache is used.
Exact steps for others to reproduce the error
- Open the attached blend file or create a super simple scene yourself by:
- add a cube as a fluid domain, - add another cube inside it as inflow. - Set both to be of fluid type. - Under the "Mesh" options check "Use Speed Vectors" - Activate motion blur in Cycles. - Set cache type to OpenVDB
- Go to frame 20 (where the falling liquid should show motion blur) and press F12
No motion blur
This exact workflow rendered with motion blur in 2.83.1 official
Eevee also doesn't show motion blur
If I open the cached VDB sequence in Houdini I can see a velocity field and vdb particles containing motion blur vectors.