Cameron White

hassancharafeddine87
what about for crowd sims, how do we instance them in lops properly?

The simple answer is to just use the SOP Crowd Import LOP (which is a wrapper around SOP Import with good defaults for importing a crowd sequence). This translates the agents into UsdSkel prims with as much scene graph instancing as possible, with a structure along the lines of https://openusd.org/dev/api/_usd_skel__instancing.html [openusd.org]

There is less instancing on the Hydra (rendering) side of things, however, so the viewport currently isn't able to do instanced GPU skinning like the SOP viewport is able to.

The Crowd Procedural LOP can also be very useful for renderers such as Karma, to convert background agents into instances of the same deformed geometry where it's safe to do so without visual artifacts. This is the same idea as the agent procedural that Mantra had enabled by default

Are you using the Curved Glass mode for glass fracturing, or Flat Panes?

The second version isn't actually attaching the prop to the joint, since the joint name `mixamorig_RightHand` is invalid (should be mixamorig:RightHand)

The main difference, though, is that the old version had a "Keep Position when Attaching" parameter which fills out the Shape Transform parameters to preserve the original world-space transform when parenting the shape to the agent's joint. The 2.0 version doesn't do this, in favour of more procedural approaches like importing rigid shape bindings from the KineFX Capture Packed Geometry SOP (https://vimeo.com/681436612)