Standard MIME type for a Draco File?

[william-silversmith]

Hi,

I was wondering what the right way to designate a file as draco compressed on cloud storage. Would that be Content-Encoding: draco with Content-Type: model/mesh or would it be something more like Content-Type: model/mesh+draco? I've seen one website recommend Content-Type: application/x.draco but that seems too informal for a relatively popular encoding type.

EDIT: Did some reading here: KhronosGroup/glTF#412 Seems model/mesh+draco would probably not be allowed. At least model/x.draco would be an improvement over application/x.draco.

Thanks!

[FrankGalligan]

Hi @william-silversmith,

Are you talking about putting Draco in a glTF file?

[william-silversmith]

Hi Frank, No I was just uploading a bunch of them to Google Cloud Storage and thought it would be good to label them accurately as the file specification didn't allow file extensions. It might help someone decode them someday even if other infrastructure is missing.

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[FrankGalligan]

@william-silversmith So you uploaded .drc files? Or glTF files encoded with Draco?

[william-silversmith]

These were files encoded using https://github.com/seung-lab/DracoPy, which is a wrapper around the C++ draco codec. I believe that means they are .drc files though there is no .drc extension.

[FrankGalligan]

OK thanks. Yeah it looks like DracoPy is just creating Draco compressed files. I.e. .drc files, not glTF Draco files.

We can look into registering the mimetype, especially if more people are creating Draco compressed files. Though I think the server will need them to be named "*.drc" in order for the server to send the correct mime type in the future.

[william-silversmith]

Thanks Frank! Fwiw, I manually set the "Content-Type" field so the filename extension will have no impact on that.