Is accessor.bufferView now optional in glTF 2.0?

[pjcozzi]

In 2.0/specification/2.0/schema/accessor.schema.json, it is not listed as required:

"required": ["componentType", "count", "type", "max", "min"]

It was required in glTF 1.0: https://github.com/KhronosGroup/glTF/tree/master/specification/1.0#accessorbufferview-white_check_mark

@sbtron do you know if this was an intention change (I couldn't find the history in GitHub) or a typo when updating the schema to JSON Schema 4?

[lexaknyazev]

Undefined bufferView means that accessor "contains" only zeros. This is used together with sparse field.

[lexaknyazev]

Expected use case is keyframe data for animated weights of morph targets.

[pjcozzi]

Ah, I should have looked at the git history. Can we make this more explicit in a gltf_detailedDescription field?

[bghgary]

@lexaknyazev Are you planning on updating the description in the schema?

[lexaknyazev]

See #970.