Forums Solaris and Karma Querying Nodes from USD Primitive path

Querying Nodes from USD Primitive path

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sebd3dvfx
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Joined: 3月 2024
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Hello,

I'm looking for a python function or a set of function that could help to retrieve the involved node(s) for a given USD primitive path.

What i may be looking for , is to extract these layer stack pathes (which are the nodes involved in the creation or edition of the prim)



Thank you!
Edited by sebd3dvfx - 2025年4月10日 04:30:47

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layer_property_stack.png (102.7 KB)

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goldleaf
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It's not always the case that layers == nodes, but where possible, LOPs will record a node's id to the "HoudiniPrimEditorNodes". This custom data is set per-primitive, and you can see it in the Scene Graph Details.

You can get at the nodes with a help function we have in loputils, by passing a lop node and prim path to loputils.getEditorNodes(). It just helps get node paths from the node ids stored as customdata.

This is used in the Scene Graph Tree's "Jump to Existing Editor Nodes" option, when you RMB on a prim.

Hope this helps!
I'm o.d.d.
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sebd3dvfx
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Ok, after some exploration i found out using the USD api instead.

Since our prims are most of the time synced with the node name (with some exception that we can specify in code), i could look up every anonymous usd layers containing the name of the node.
This allows to retrieve specific nodes quite fast :

prim = stage.GetPrimAtPath("/world/primitive")
prim_name = prim.GetName()
for prim_spec in prim.GetPrimStack():
    for lyr in prim_spec.layer.GetLoadedLayers():
        lyr_name=lyr.GetDisplayName() # contains the houdini node name
Edited by sebd3dvfx - 2025年4月11日 07:32:17
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