glTF 2.0 draft

[lexaknyazev]

Previous discussion was in #784.

• Overview of spec changes: Spec changes from 1.0 to 2.0 #605
• Direct link to 2.0 spec: https://github.com/KhronosGroup/glTF/tree/2.0/specification/2.0
• Direct link to KHR_technique_webgl extension stub: https://github.com/KhronosGroup/glTF/tree/2.0/extensions/Khronos/KHR_technique_webgl
• Direct link to branch: https://github.com/lexaknyazev/glTF/tree/2.0

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Story so far:

• rewritten git history of 1.0.1 and lexaknyazev/master-test branches with changed paths to specification/2.0 directory;
• objects-to-arrays syntax change update;
• techniques, shaders, programs were moved to KHR_technique_webgl extension;
• updates on JSON encoding and binary data layout

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Specification TODOs
General 2.0 stuff:

• Update wetzel to v4 schema and regenerate property reference, @lasalvavida
• Update Overview / Reference Card Update reference card for glTF 2.0 #761, @javagl
• Make sure everyone is properly acknowledged in the spec, @pjcozzi
• Add notes about scenes Handling multiple scenes without a default scene #815, @lexaknyazev
• Publish reasons on syntax and encoding changes glTF 2.0 syntax changes and JSON encoding restrictions #831, @lexaknyazev
• Elaborate on asset reqs / platform caps glTF 2.0 asset profiles and caps #829
• Update date in spec for "Last Updated"

Binary GLB format integration:

• Integrate .glb file format as a specification appendix, @lexaknyazev
• Elaborate on referencing .glb buffer Referencing glb-stored buffer #828, @lexaknyazev

PBR:

• Integrate PBR, Merge PBR Metallic-Roughness into glTF 2.0 #830, @sbtron, @bghgary
• Elaborate on PBR conformance Should PBR be required in glTF Next? #785
• Evaluate multi-UV Multi-uv support ? #742
• Tangent-space storage Add BINORMAL and TANGENT attribute semantics #812

Skinning & Morphs:

• Skinning update Culling animated models. #723 (comment)
• Sparse Arrays Sparse Array storage. #820, @emilian0
• Integrate morph targets, proposal for morph & interaction with skin #164, Basic Morph Syntax #210, @emilian0

Other:

• Close issues labeled 2.0, all of which should also be labeled resolved, @lexaknyazev / @pjcozzi

glTF 2.0 project: #867

[pjcozzi]

Wow, great job, @lexaknyazev! I will review this a bit today and over the weekend. Thanks for this detailed work.

[pjcozzi]

Update wetzel to v4 schema and regenerate property reference

@lasalvavida can you please do this after your COLLADA2GLTF 2.0 updates? We also need it for 3D Tiles, CesiumGS/3d-tiles#37 (however, no need to generate that doc now).

[pjcozzi]

I added names to items in the above tasklist, #826 (comment), please let me know if anything is incorrect.

[lexaknyazev]

@pjcozzi
My proposal in #742 (multi-UV) remains (with 2.0 syntax changes).
Could PBR team review it?

[pjcozzi]

@lexaknyazev could you please review the 2.0 issues and label them resolved if they are already included in this PR?

[pjcozzi]

My proposal in #742 (multi-UV) remains (with 2.0 syntax changes).
Could PBR team review it?

Will ask there.

[pjcozzi]

@sbtron can any of the issues labeled PBR be closed or combined to help keep us organized?

[lexaknyazev]

@lexaknyazev could you please review the 2.0 issues and label them resolved if they are already included in this PR?

GitHub 2.0 issues and tasklist above should be in sync now.