When is the render data refreshed?

[matiascodesal]

It's unclear to me when the plugin re-reads changes from the input USD files and blender data? I found myself needing to rebuild the node tree in order to see my changes in the viewport.

[bnagirniak]

Yes, in some cases you have to rebuild node tree to see changes in viewport, this part will be fixed/improved.

[bsavery]

Can you convert this into an issue with some examples? @matiascodesal

[matiascodesal]

Happy New Year! Here's the logged issue: #30

Another issue that threw me off early on is that if your USD stage doesn't have a defaultPrim defined, the "Read USD File" node will error and not read the USD file. This is unfortunate because Blender's USD export writes a file with multiple prims at the root level and no defaultPrim. This most basic workflow fails:

1. Export a Blender scene to USD
2. Load it with BlenderUSDHydra

This is probably more of an issue with the exporter though?