Implement selection in the Viewer #27
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Feature
Here's a quick test to get mouse clicks in the viewer to be able to select prims inside the view - porting some of the functionality from USD View itself.
Note however that since it relies on USD View's data model it requires
pxr.Usdviewqand thus this particular data model can't be used with e.g.usd-core. For this prototype it's not an issue because this currently only applies to the viewer widget which itself can also only work if that library is present.Nonetheless for #25 we would need a data model that can be shared between all widgets. The question then becomes whether we want to completely roll our own data model so it can be separate from
pxr.Usdviewqdependency or unfortunately maybe make the USD viewer a requirement itself.@Sasbom with this PR you're at least able to click around in the viewport to e.g. select some prims and then press F to frame selected or A to frame all.