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<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://developer.blender.org/T81257">https://developer.blender.org/T81257</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The corresponding git.blender.org branch is usd-importer-T81257.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are the main features implemented so far:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">Basic support for importing USD meshes with UVs and normals.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">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.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">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.)<o:p></o:p></li></ul>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoNormal">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. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">No doubt, this code overlaps with the importer implemented by Tangent, as previously described by Blazej.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I very much welcome everyone’s feedback and questions, and will continue to post status updates on this project in the coming weeks.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Michael<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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