2020-10-05

Owned by Michael Dolan
Feb 24, 2021
4 min read

October 5, 2020

Host: Michael Dolan

Attendees:

  • [X] Mark Boorer (TSC) - Industrial Light & Magic

  • [X] Mei Chu (TSC) - Sony Pictures Imageworks

  • [ ] Sean Cooper (TSC ACES TAC Rep) - DNEG

  • [X] Michael Dolan (TSC Chair) - Epic Games

  • [X] Patrick Hodoul (TSC) - Autodesk

  • [ ] John Mertic - Academy Software Foundation / Linux Foundation

  • [X] Carol Payne (TSC) - Netflix

  • [X] Mark Titchener (TSC) - Foundry

  • [ ] Carl Rand (TSC) - Weta Digital

  • [ ] Doug Walker (TSC Chief Architect) - Autodesk

  • [X] Kevin Wheatley (TSC) - Framestore

  • [X] Bernard Lefebvre - Autodesk

  • [X] Thomas Mansencal - Weta Digital

  • [X] Aymee Yeh - Netflix

  • [X] J Schulte - Industrial Light & Magic

  • [X] Matthias Scharfenberg - Industrial Light & Magic

Apologies

  • Doug Walker

OCIO TSC Meeting Notes

  • Review pending PRs:

    • #1160 - C++ API docs:

      • Initial work and structure of C++ API docs. Feedback on organization of content welcome. Can look at RST or build locally. Also includes some general CMake changes and removal of auto-install of documentation-specific dependencies.

      • Patrick: Noticed this morning on tsc-private topic related to copyright of images found with license scan. Needs a look.

    • #1159 - Improve CMake files:

      • Patrick: Not C++. Faced issues with CMake on Windows and tried to fix.

    • #1157 - FileTransform interpolation:

      • Patrick: Last meeting discussed v1 not throwing if interpolation was missing. Bernard checked and it is throwing for FileTransform (i.e. LUTs) as expected.

    • #1156 - Meeting minutes:

      • Patrick: Needs another approval.

  • Introducing Aymee Yeh:

    • Carol: Introducing Aymee to OCIO project. PM from Netflix who is interested in learning more about project management in open source.

    • Aymee: Work with Carol at Netflix on project management. Here to listen to see where I can help.

    • Carol: Provided some resources from GH repo.

    • Michael: Please let us know if you have any questions. OCIO Slack workspace is a good place to discuss, and any ideas an input are very appreciated.

  • Issue #1162 - PROCESS.md feedback:

    • Thomas: In a good place. Would be great to have more people giving feedback. Explicit approval better than silent assent.

    • Carol: Also think it looks good, but will have another look.

    • Patrick: To highlight, there's a trend in OSS that saying nothing means its fine, but sometimes better to have explicit approval in a comment to an issue or PR. Some feedback to know where you stand.

    • Michael: "LGTM" is a good response if you're in agreement.

    • Patrick: If you take time to read it, take a time to comment.

    • Thomas: On GH, approval is a click away also.

    • Mark B: Only comment is with big changes throughout development. Since PRs were dependent on each other, decided to wait till work was more complete to review. Have some concerns that there's not enough time to vet work while pushing towards release date.

    • Patrick: Good concern, and why we have 4 month stabilization period to test and dig into what we did. Up to you to tell us. We did our best to explain and add tests, which are also a way to explain the features. Please tell us if something is unclear or a concern.

    • J: Understood. Sometimes huge wave of commits takes a lot of time to review. Good buffer to look and rethink it.

    • Michael: Good to take time to review PRs if you can since it's easier to adjust work in progress than completed work. Probably too late to change architectural decisions.

    • Patrick: Best to start with unit tests and public API to get sense of features and changes. Can also start with Python. Start with something you are familiar with.

    • Thomas: Whenever not finding something in Python code, looking at C++ unit tests and that is very helpful.

    • Mark B: Lots of stuff from previous TSC meetings and working group meetings where it's hard to track outcome of discussions. Not sure whether those changes were addressed or gone over. Need to check up on a lot of stuff and follow through. No issue with architectural stuff so much. Two or three things to follow up on though. Worried our concerns will be lost because of imposed deadline. Would be a shame if features go out if solutions doesn't match spirit of previous library version.

    • Mark T: What things are you concerned about?

    • Mark B: ICC display transforms. Live grading controls and how those interact. Environment resolution. Bit-depth - how it's expressed in graph and config.

    • Patrick: Suggestion - build a list and next TSC meeting would like to discuss these points. We can address questions over several meetings. Even if we did some WG sessions and created defects for all the features, we could still explain again what we all agreed to do and follow up on any concerns.

    • All: Agree this is a good idea.

    • Mark: T: Others can look at areas of concerns too.

    • Patrick: Yes, we are waiting and eager to have more eyes on what we did.

    • Michael: Lots of little pieces have come together, so understood that it's easier to review larger features now that they are complete.

    • J: Continuity of involvement has been challenge, with big waves of work.

    • TODO: Mark B and others to provide list of features for review with AD team during future TSC meetings. Similar discussion to v2 working group.

  • ACES Gamut Mapping Quick Update - for FYI:

    • Carol: Matthias and I co-chairing gamut mapping wg. We put out a status update and will share a link. We're getting close to moving on to implementation of the algorithm as long as user testing goes well. There's a test impl on GH: https://community.acescentral.com/t/aces-gamut-mapping-vwg-status-update/3259 which can be tested in Nuke, Baselight, Python, etc. Hoping to get into OCIO v2 as builtin transform. Imagining OCIO big use case for this operator in lots of VFX spaces. More complicated than a 3D LUT.

    • Matthias: Main reason for this implementation is precision, in particular for inverting the transform. Is possible to implement in OCIO v1 with shaper space potentially, but precision is compromised and made non-invertible. Much more desirable to be evaluated as builtin transform. Not super complicated on processing side, shouldn't slow things down.

    • Carol: May be asking for input in best way to implement, probably starting early next year. Getting user testing done in the next month. Finalizing architecture deliverable to Academy, which is CTL by end of year.