2025-04-15 Animation & Rigging module meeting

Meetings
1

The meeting will be on 2025-04-15T10:00:00Z. It is open for everybody interested to join the video call (link below).

People present are referred to by first name for brevity. Others are referred to by full name.

Present: Christoph Lendenfeld, Hjalti Hjálmarsson, Nacho de Andrés, Nathan Vegdahl, Pablo Fournier, Rik Schutte, Sybren Stüvel

Links

Opening

  • Please raise your hand when you don’t understand things for any reason. The purpose of these meetings is collaboration. It is absolutely fine to ask for explanations.
  • There are no recordings of the meeting. This way everybody is free to say or show anything they want.

Since the Last Meeting / Announcements

  • Blender 4.4.1 was released today, with an interesting number of bug fixes for slotted actions.

Landed

Names are from the Git log. This list is limited to functional improvements & bugfixes.

Blender

Technical Documentation

Ongoing Work

  • High Severity bugs:
  • Andy
  • Christoph:
  • Nathan:
    • Nathan’s weekly report
    • For animation & rigging, mainly just PR reviews and discussions.
    • Should we just always display wireframe bones as proper wireframe (no semi-transparent faces)? Context: #131810: UI: Transparent Armature Bone Selection
      • Nathan: The PR adds an option to do this. Question: should we have that as an option, or should we just always draw bones that way?
      • Nathan: pretty is great, but when it conflicts with functionality, functionality should take precedence. In the future, when the drawing/viewport code doesn’t force us to make this choice, we can go for pretty and functional.
      • Christoph: when the viewport is in wireframe mode, it should always draw the armature in wireframe mode too.
      • Nathan: for clarification, his proposal is to always remove the semi-transparent faces when the armature would be draw in wireframe mode.
      • Sybren: for me the opposite (i.e. current behaviour) doesn’t make sense. When drawing in wireframe mode, why draw semi-transparent faces?
      • Nathan: same for meshes, there you also see which faces actually exist.
      • Hjalti: misses the old behaviour, where there was actual wireframe drawing.
      • Nacho: would they also be drawn in wireframe in X-ray mode of the pose mode? With the rest of the viewport in a non-wire mode?
      • Nathan: yes, that will work. X-Ray and wireframe drawing are independent, so you can set the armature to have both X-Ray and wireframe.
      • Conclusion: module agrees to not have this as an option, but to just remove the semi-transparent faces from wireframe mode.
  • Sybren:
    • Sybren’s weekly report
    • Created #137515: Parallel driver evaluation: unshare or lock?
    • Worked on #133392: Chained drivers do not update
      • Might need some further optimization, as the fix now requires O(ND) steps, where N is the number of nodes in the depsgraph, and D is the number of drivers in the scene.
      • Nacho: does it prevent dependency loops? If you have drivers A → B → C → A?
      • Sybren: nope. You’ll get the usual warnings about dependency cycles.
      • Nathan: really surprised that this wasn’t working. Could have sworn that he made rigs that used this, and that it worked.
      • Sybren: it might have worked with the old dependency graph.
      • Module agrees this should work.

Next Meeting

The next meeting will be on 2025-04-24T16:00:00Z. Again it will be open for everybody who’s interested. The provisionary meeting agenda will be updated before the meeting.

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