[Bf-usd] USD importer progress

[Blazej Floch]

Hi everyone,

It took some time but we finally got our USD Import and Export branches public.

Detailed information can be found here (please the "Info" links for more details, we've updated the text based on our current state):

https://github.com/tangent-opensource/hdcycles/wiki

We are sorry this took longer than anticipated to get through the process. It means that meanwhile we have some duplication on the import part.
I hope we can coordinate how our work ties into:
http://developer.blender.org/T81257

Take your time to go through the material.

I think the important part will be understanding how we want to treat the upstream development on the importer. Are there features that we see useful from either implementations, and which base do we feel confident to use for future work so we can eliminate the duplication of work moving forward.

For the exporter we will probably push the additions for review to the bf next. So far, our code is based on 2.83, which is our stable production build for the upcoming project requiring this work.

Looking forward to hear your feedback!
Thanks,
Blazej

________________________________
From: Bf-usd <bf-usd-bounces at blender.org> on behalf of Francesco Siddi <francesco at blender.org>
Sent: Monday, November 9, 2020 14:49
To: Blender USD Workgroup <bf-usd at blender.org>
Subject: Re: [Bf-usd] USD importer progress

Hi Michael,

Thank you for sharing your progress! I did a quick test (including instancing) and so far the importer works as expected.
I left a comment on developer.blender.org/T81257<http://developer.blender.org/T81257> with some pictures.

Besides the usual “Attic", “Kitchen" and other simple demo scenes it would be very useful to have some production samples to test the current implementation. Suggestions and contributions are welcome! I’m particularly interested in content distributed with a permissive (CC-BY or similar) license so that the files can be shared on blender.org<http://blender.org>.

Everyone is welcome to share links here or directly with me.

Regards,
Francesco

--------------------------------------------------------------
Francesco Siddi  -  francesco at blender.org<mailto:francesco at blender.org>   -  www.blender.org<http://www.blender.org/>
COO at Blender and Producer at Blender Studio
Buikslotermeerplein 161 - 1025 ET Amsterdam - The Netherlands


On 9 November 2020 at 17:39:24, Michael A Kowalski (makowalski at nvidia.com<mailto:makowalski at nvidia.com>) wrote:

Hello everyone,



To follow up on Francesco’s email from last week, I’d like to briefly report the status of the work on the USD importer.  The task description can be found here:



https://developer.blender.org/T81257



The corresponding git.blender.org<http://git.blender.org> branch is usd-importer-T81257.



This is very much a work in progress.  As per the task description, the initial implementation is loosely based on the design of the Alembic importer.  In fact, in many places the USD importer code follows the corresponding Alembic implementation very closely.  The basic strategy is to iterate over the USD stage to instantiate “reader” classes that translate USD primitives to Blender objects.



Here are the main features implemented so far:



  *   Basic support for importing USD meshes with UVs and normals.
  *   Work in progress on material import:  creation of material slots and assignment of material indices.  Existing Blender material matching the names of USD materials will be automatically assigned to the corresponding slots.
  *   Experimental support for instancing:  instanceable USD mesh primitives can be imported as shared meshes in Blender.  (However, the importer doesn’t yet handle converting USD point instancer primitives.)



I consider this work to be a prototype which can be used to motivate discussion of the design.   I’m quite open to redesigning and refactoring the code as needed based on feedback and testing, of course.   Needless to say, many features are missing and there are opportunities for optimization.



No doubt, this code overlaps with the importer implemented by Tangent, as previously described by Blazej.



I very much welcome everyone’s feedback and questions, and will continue to post status updates on this project in the coming weeks.



Thank you!



Michael



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