Possible inconsistency for undefined texture sampler handling

[javagl]

The text at https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#textures says

When texture.sampler is undefined, a sampler with repeat wrapping (in both directions) and auto filtering MUST be used.

The properties reference at https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#reference-texture says about the sampler

The index of the sampler used by this texture. When undefined, a sampler with repeat wrapping and auto filtering SHOULD be used.

I think that this MUST vs. SHOULD is an inconsistency.

[javagl]

(And I'm currently wondering what "auto filtering" means, but that's somewhat unrelated...)

[tksuoran]

Auto filtering is not specified anywhere in the specification. I was tempted to file a bug about this, but since it is already mentioned here I'll leave it at this.

[donmccurdy]

Older discussion:

• texture.sampler auto filtering #2096

[javagl]

@donmccurdy I should have searched more thoroughly for "auto filtering". And in fact, this issue could ... 'somewhat' ... be a duplicate of the linked one, because you already mentioned the 'MUST' in #2096 (comment) (compared to the 'SHOULD' from the intial post there). Even based on the response by @lexaknyazev, I think that having both 'MUST' and 'SHOULD' for the same case is an inconsistency that should be resolved (one way or another).