Add meeting notes 2022-09-06 and 2022-10-04.

Signed-off-by: Andre Pradhana <[email protected]>

Author: apradhana

tsc/meetings/2022-09-06.md

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+Minutes from 145th OpenVDB TSC meeting, September 6th, 2022, (EDT)
+
+Attendees: *Ken* M., *Dan* B., *Rich* J. *Andre* P.
+
+Regrets: *Nick* A., *Jeff* L.
+
+Additional Attendees: Peter Cheng (DW), Karl Marett, Sebastian Gaida,
+JT Nelson (Blender), Greg Hurst (United Therapeutics), Bruce Cherniak (Intel)
+
+Agenda:
+
+1) Confirm quorum
+2) Secretary
+3) Forum and Discussion
+   a) Request to expose 4x4 matrix in Python bindings
+   b) Update build instruction
+4) Failure in NanoVDB CI
+5) VDB in medical imaging (OpenVDB Slack Channel)
+6) Mathematica Link Update
+7) Update from DreamWorks
+8) CI Effort
+9) Root Node Offset
+10) Next Meeting
+
+--------------------
+
+1) Confirm quorum
+
+Quorum is present.
+
+2) Secretary
+
+Secretary is Andre Pradhana
+
+3) Forum and Discussion
+   a) Request to expose 4x4 matrix in Python bindings.
+      This should be done through PyBind 11. A few people expressed an interest
+      to help with this task.
+
+   b) Update build instruction to reflect the correct version of TBB.
+
+4) Failure in NanoVDB CI
+
+We look at failure NanoVDB CI failure in MacOS. Ken has an idea that it may
+be caused by the new allocation that is implemented.
+
+5) VDB in medical imaging (OpenVDB Slack Channel)
+
+Somebody was asking about the potential of using OpenVDB or NanoVDB for medical
+imaging purposes. The answer is: yes, VDB can be used for this purpose.
+
+6) Mathematica Link Update
+
+Greg is still waiting for a reply from Wolfram.
+
+7) Update from DreamWorks
+
+DreamWorks said that they will go through with a more thorough investigation of
+existing old VDB files that uses the dense table in the root node. They will
+probably convert old VDB files to new VDBs.
+
+8) CI Effort
+
+Dan gives an update on the CI effort. We have an access to two machines provided
+by AWS.
+
+Dan claims that the billable hours for all CI to finish is 1 hr and 43 minutes.
+
+9) Root Node Offset
+
+Ken revisited his work on the root node offset. He did not find any performance
+issues with the new implementation. Several things to note:
+a) The way that Ken solves the problem is by adding a CoordT origin in
+   the root node to offset the position of the children of the root node.
+b) The offset should coincide with the grand-child of the root. In a regular
+   tree configuration the offset should be 2048 = 16 * 16 * 16 / 2.
+c) Ken proposed the origin offset on the root-node to be dynamic, because
+   in the future, we can read an old VDB file with the root node origin
+   set to be (0, 0, 0).
+
+He proposed that we would go through with the ABI change, i.e. adding the
+origin member data in the root. He also proposed that in the future, doing
+operations on two or more different grids should be restricted on grids
+with the same origin.
+
+10) Next meeting
+
+Next meeting is on September 13th, 2022. 1pm-2pm EDT (GMT-4).

tsc/meetings/2022-10-04.md

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+Minutes from 149th OpenVDB TSC meeting, September 27th, 2022
+
+Attendees: *Jeff* L., *Andre* P, *Nick* A., *Dan* B.,
+*Rich* J., *Ken* M.,
+
+Additional Attendees: JT Nelson (Blender), Sebastian Gaida, Greg Hurst,
+Barry Dempsey
+
+Regrets: none
+
+Agenda:
+
+1) Confirm quorum
+2) Secretary
+3) Forum
+4) Mathematica Link
+5) CI
+6) PR-1469
+7) Root Node Offset
+8) VDB Tool
+9) Meeting link
+10) Next meeting
+
+--------------------
+
+1) Confirm quorum
+
+Quorum is present.
+
+2) Secretary
+
+Secretary is Andre Pradhana
+
+3) Forum
+
+No issues.
+
+4) Mathematica Link
+
+Greg compiled the Mathematica Link on a Windows machine. He will write
+a README and a documentation.
+
+5) CI
+
+Nick fixed CI issues related to the way vcpkg deals with tbb. The Houdini 19.5
+CI is currently failing because of a problem related to either zlibc or boost.
+
+6) PR-1469
+
+Nick will take a look at PR-1469 from Dan.
+
+7) Root Node Offset
+
+It is recommended to remove some additional methods from the root node class and
+move them outside. It was agreed to make the get-origin and set-origin methods to
+be public, but throw an error if a user calls it.
+
+8) vdb_tool
+
+It was clarified that python support through VDB tool is not supported by VDB tool
+for the VDB 10 release.
+
+9) Meeting link
+
+We will still use the new meeting link for next week.
+
+10) Next meeting
+
+Next meeting is on October 11th, 2022. 2pm-3pm EDT (GMT-4).