[Bf-usd] USD importer progress

[Francesco Siddi]

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 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.

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

Regards,
Francesco

--------------------------------------------------------------
Francesco Siddi  -  francesco at blender.org   -  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)
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 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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