OMI glTF Working Group Meeting 2022-03-17

[robertlong]

OMI glTF Working Group Meeting 3/17/2022

This meeting will be on 3/17/2022 at 10:30 PM (UTC) / 2:30 PM (PST) in the OMI Discord within the #omi-weekly-meeting channel. During the meeting, we will be using the #omi-gltf-extensions channel to manage a speaker queue, post links, and for any sidebar discussions.

To be notified of this meeting and others, subscribe to the OMI Meetings and Events Calendar or add yourself to the @omi-gltf-subgroup role in the #roles channel of the OMI Discord.

Agenda:

• Text Extension
  • Proposal: dynamic text #62
• OMI_audio_emitter
  • https://github.com/omigroup/gltf-extensions/tree/main/extensions/2.0/OMI_audio_emitter
  • Vote to advance to stage 3?
  • Discuss unifying OMI_audio_emitter and MSFT_audio_emitter
  • Support WAV Audio in OMI_audio_emitter #70
  • Picking up Blender Addon work again Create Blender OMI_audio_emitter Addon #29
• Collider extension check-in
  • Add OMI_collider #63
• Avatar Animation Retargeting
  • Applying Animations Stored in a Separate GLTF #44

To propose another item for the agenda, comment below (preferably before the meeting).

[robertlong]

Notes:

• Due to timezone confusion, we started an hour later than usual. We will be keeping the time at 2:30 PM PDT / 9:30 PM UTC next week.

Visibility Extension Proposal

• glTF has the ability to control visibility via setting scale to 0,0,0. Runtimes can optimize this away.
  • https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#transformations
• However, this doesn't really help when you want to toggle visibility and set an initial scale
  • Relying on animations to do this makes optimizations hard
  • Animated objects can't be set as static in many runtimes
  • All we really want is to set a flag to change visibility

[robertlong]

From the 3/31 meeting:

{
  "nodes": [
   { 
     "extensions": {
        "OMI_hidden_mesh": {
            "mesh": 0
         },
         "MOZ_hubs_components": {
           "nav-mesh": {}
         }
      }
   }
  ]
}

const mesh = new Mesh();
mesh.visible = false;

[robertlong]

KhronosGroup/glTF#1760

[robertlong]

https://github.com/KhronosGroup/glTF/blob/b55d472fcb7d239180a20d76f53c391231bf85c8/extensions/2.0/Vendor/PTC_onshape_metadata/README.md