UsdView: Display resolved labels in attribute editor

pxr/usdImaging/bin/testusdview/testenv/testUsdviewPropertySearch/testUsdviewPropertySearch.py

@@ -38,7 +38,7 @@ def _search(appController, searchTerm, expectedItems):
 def _testSearchBasic(appController):
     _search(appController, 'a', 
             ['Local to World Xform', 'Resolved Preview Material',
-             'Resolved Full Material', 'a'])
+             'Resolved Full Material', 'Resolved Labels', 'a'])
     _search(appController, 'myR', ['myRel'])
     _search(appController, 'y', 
             ['myRel', 'proxyPrim', 'visibility', 'y'])

pxr/usdImaging/usdviewq/customAttributes.py

@@ -5,7 +5,7 @@
 # https://openusd.org/license.
 #
 
-from pxr import Usd, UsdGeom, UsdShade
+from pxr import UsdGeom, UsdShade, UsdSemantics
 from pxr.UsdUtils.constantsGroup import ConstantsGroup
 
 
@@ -15,6 +15,7 @@ class ComputedPropertyNames(ConstantsGroup):
     LOCAL_WORLD_XFORM       = "Local to World Xform"
     RESOLVED_PREVIEW_MATERIAL = "Resolved Preview Material"
     RESOLVED_FULL_MATERIAL = "Resolved Full Material"
+    RESOLVED_LABELS        = "Resolved Labels"
 
 #
 # Edit the following to alter the set of custom attributes.
@@ -35,9 +36,10 @@ def _GetCustomAttributes(currentPrim, rootDataModel):
                 LocalToWorldXformAttribute(currentPrim, 
                                            rootDataModel),
                 ResolvedPreviewMaterial(currentPrim, rootDataModel),
-                ResolvedFullMaterial(currentPrim, rootDataModel)]
-
-    return []
+                ResolvedFullMaterial(currentPrim, rootDataModel),
+                ResolvedLabelsAttribute(currentPrim, rootDataModel),
+        ]
+    return [ResolvedLabelsAttribute(currentPrim, rootDataModel)]
 
 #
 # The base class for per-prim custom attributes.
@@ -137,6 +139,23 @@ def __init__(self, currentPrim, rootDataModel):
         ResolvedBoundMaterial.__init__(self, currentPrim, rootDataModel, 
                 UsdShade.Tokens.preview)
 
+#
+# Displays a prim's inherited labels
+#
+class ResolvedLabelsAttribute(CustomAttribute):
+    def GetName(self):
+        return ComputedPropertyNames.RESOLVED_LABELS
+
+    def Get(self, frame):
+        inheritedTaxonomies = UsdSemantics.LabelsAPI.ComputeInheritedTaxonomies(self._currentPrim)
+        resolvedLabels: dict[str, list[str]] = {}
+        for taxonomy in inheritedTaxonomies:
+            query = UsdSemantics.LabelsQuery(taxonomy, frame)
+            labels = query.ComputeUniqueInheritedLabels(self._currentPrim)
+            resolvedLabels[taxonomy] = list(labels)
+        return resolvedLabels
+
+
 class ComputedPropertyFactory:
     """Creates computed properties."""
 
@@ -155,6 +174,8 @@ def getComputedProperty(self, prim, propName):
             return ResolvedFullMaterial(prim, self._rootDataModel)
         elif propName == ComputedPropertyNames.RESOLVED_PREVIEW_MATERIAL:
             return ResolvedPreviewMaterial(prim, self._rootDataModel)
+        elif propName == ComputedPropertyNames.RESOLVED_LABELS:
+            return ResolvedLabelsAttribute(prim, self._rootDataModel)
         else:
             raise ValueError("Cannot create computed property '{}'.".format(
                 propName))