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Minutes from 102nd OpenVDB TSC meeting, August 17th, 2021, (EDT)
Attendees: Ken M., Jeff L., Andre P, Nick A., Dan B.
Additional Attendees: JT Nelson (Blender), Richard Jones (DNeg)
Regrets:
Agenda:
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Confirm Quorum
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Secretary
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Google Forum
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Autodesk collaboration
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Siggraph talks / papers
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Root Node Offset
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VFX Reference Platform
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Blind Data
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NanoVDB
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Next meeting
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Confirm Quorum
Quorum is present.
- Secretary
Secretary is Dan Bailey.
- Google Forum
Request from Autodesk to resolve an issue with how symbols are exported on Windows. After some back and forth, Nick proposed introducing a mechanism to customize the VDB namespace as the easiest solution, ideally would also work with the custom namespacing that SideFX is using. There may still be room to improve symbol visibility.
- Autodesk collaboration
Autodesk still interested in a collaboration. OpenVDB does not currently have multi-resolution grids so would benefit the library. Ken to discuss further with them to find out potential next steps.
- Siggraph talks / papers
Jeff mentions two papers that are of interest:
- Displaced Signed Distance Fields for Additive Manufacturing
This paper efficiently stores a voxel displacement to the true surface on top of a signed distance field for more accurate results without increasing resolution. Primarily aimed at 3D printing, but could be useful to VDB.
- Swept Volumes via Spacetime Numerical Continuation
This paper attempts to solve the "stamping" problem when generating smooth representations from moving objects. It works by storing timestamps with the query samples and essentially performs a spatial search optimizing for the temporal values to project back to the swept surface. Could be very useful for fast moving collisions in VDB in particular among other applications.
- Root Node Offset
Ken still looking at a 2048 voxel offset, he has run into some logistical challenges attempting to reorganize the data in the grid but experimenting on top of NanoVDB with a hope to bring a solution to OpenVDB to release in time for VDB 9.0.
- VFX Reference Platform
The VFX Reference Platform committee has confirmed a final deadline of 1st November 2021 for release of OpenVDB 9.0 in order to include it in CY2022, otherwise it will revert back to 8.x. The draft document has been updated to tentatively show 9.x with a note to this effect.
- Blind Data
After some discussion, decision made to revert back to using Index32 instead of Index64 for blind data offsets, as changing this later will not need a change to the Grid ABI.
- NanoVDB
Andre has started looking at the build system for NanoVDB and asked a few questions about integration. Nick provided some initial feedback on the PR, Ken looking for a more detailed explanation in terms of CMake changes required. Discussion to be continued.
- Next meeting
Next meeting is August 31st, 2021. 12pm-1pm EST (GMT-5).