Gltf-blender-io: GLB models with Draco compression don't load in Blender 2.8

[EtagiBI]

Hello,

GLB models with Draco compression don't load in Blender 2.8. I get this error:
RuntimeError: Error: Extension KHR_draco_mesh_compression is not available on this addon version

Blender 2.8 build: 74db65e5424-win64

[julienduroure]

Hello,
this is a known "issue", Draco is not implemented in this addon (importer neither exporter).

There is some plan to implement it. We will keep you informed when we will work on it

[EtagiBI]

Hello,
this is a known "issue", Draco is not implemented in this addon (importer neither exporter).

Hmm. I was sure it worked in some old builds of Blender 2.8 Beta. Or was it KHR_Texture_Transform?.. Anyway, I do hope that Draco compression will have a high priority in your roadmap.

Thanks for all your efforts!

[Zool1987]

until it's settled in blender 2.8...
How to decode draco_gltf_file or draco_gld_file back through the gltf - pipeline? It turns out to encode, but not back …Is there an online tool for decoding?

[rmas97]

Hello, is there any alternative way to decode a Draco compressed file and import it in Blender (2.81a)?
Thank you very much!

(sorry for bad english, is not my native language)

[donmccurdy]

You can open a Draco-compressed glTF file in https://threejs.org/editor/ and export back out to glTF. That would remove any Draco compression on the file. In general I would recommend keeping source files (plain glTF, or ideally .blend or .3ds etc.) as Draco compression is lossy and not something you'd want to apply and remove repeatedly when making edits to a file.

[rmas97]

It worked. Thank you very much for the hint!
Best regards

[lanxinger]

Draco export works now but import is still broken. Is that something on the roadmap?

[julienduroure]

Draco importer is not really "broken", because it is only not implemented yet.
Don't think someone worked on it yet, so I can't provide any roadmap. I will let you know when we will be able to provide more information

[lanxinger]

Sorry for the wrong wording. Thank you for your quick response. Looking forward to having this ability in the future.

[donmccurdy]

Another workaround here, probably simpler than https://github.com/KhronosGroup/glTF-Blender-IO/issues/252#issuecomment-579885205 —

npm install --global @gltf-transform/cli@alpha

# Make an uncompressed copy of 'compressed.glb'
gltf-transform copy compressed.glb uncompressed.glb

^The copy command decompresses by default now, but in the future that will probably require a more specific command. After decompressing the file, Blender will be able to read it.

[resuly]

Another workaround here, probably simpler than #252 (comment) —

npm install --global @gltf-transform/cli@alpha

# Make an uncompressed copy of 'compressed.glb'
gltf-transform copy compressed.glb uncompressed.glb

^The copy command decompresses by default now, but in the future that will probably require a more specific command. After decompressing the file, Blender will be able to read it.

The alpha version keeps throwing this error.

[julienduroure]

@resuly You can report bugs on gltf-transform here : https://github.com/donmccurdy/glTF-Transform

Let's try to keep this repo for Blender importer / exporter issues

[donmccurdy]

That issue should be fixed if you update to the latest alpha (by re-running the same installation command). Otherwise, as Julien suggests, I'm happy to take bug reports on the repo above. Thanks for letting me know! 👍

[donmccurdy]

Fixed at https://github.com/KhronosGroup/glTF-Blender-IO/pull/1268.