EMSUSD-489 fix reparenting crash

lib/mayaUsd/ufe/UsdTransform3dMatrixOp.cpp

@@ -119,6 +119,9 @@ class UsdSetMatrix4dUndoableCmd : public UsdUndoableCommand<Ufe::SetMatrix4dUndo
         // transform3d() returns a whole-object interface, which may include
         // other transform ops.
         auto t3d = Ufe::Transform3d::editTransform3d(sceneItem());
+        if (!TF_VERIFY(t3d)) {
+            return;
+        }
         t3d->setMatrix(_newM);
     }
 

lib/usdUfe/ufe/UsdUndoInsertChildCommand.cpp

@@ -198,6 +198,8 @@ static void doInsertion(
 
     enforceMutedLayer(srcPrim, "reparent");
 
+    int affectedLayersCount = 0;
+
     // Do the insertion from the source layer to the target layer.
     {
         PrimLayerFunc insertionFunc
@@ -208,7 +210,7 @@ static void doInsertion(
 
         const bool includeTopLayer = true;
         const auto rootLayers = getAllSublayerRefs(stage->GetRootLayer(), includeTopLayer);
-        applyToSomeLayersWithOpinions(srcPrim, rootLayers, insertionFunc);
+        affectedLayersCount += applyToSomeLayersWithOpinions(srcPrim, rootLayers, insertionFunc);
     }
 
     // Do the insertion in all other applicable layers, which, due to the command
@@ -223,7 +225,18 @@ static void doInsertion(
 
         const bool includeTopLayer = true;
         const auto sessionLayers = getAllSublayerRefs(stage->GetSessionLayer(), includeTopLayer);
-        applyToSomeLayersWithOpinions(srcPrim, sessionLayers, insertionFunc);
+        affectedLayersCount += applyToSomeLayersWithOpinions(srcPrim, sessionLayers, insertionFunc);
+    }
+
+    // If no local layers were affected, then it means the prim is not local.
+    // It probably is inside a reference and we do not support reparent from within
+    // reference at this point. Report the error and abort the command.
+    if (0 == affectedLayersCount) {
+        const std::string error = TfStringPrintf(
+            "Cannot reparent prim \"%s\" because we found no local layer containing it.",
+            srcPrim.GetPath().GetText());
+        TF_WARN("%s", error.c_str());
+        throw std::runtime_error(error);
     }
 
     // Remove all scene descriptions for the source path and its subtree in the source layer.
@@ -241,7 +254,18 @@ static void doInsertion(
               }
           };
 
-    applyToAllLayersWithOpinions(srcPrim, removeFunc);
+    affectedLayersCount = applyToAllLayersWithOpinions(srcPrim, removeFunc);
+
+    // If no local layers were affected, then it means the prim is not local.
+    // It probably is inside a reference and we do not support reparent from within
+    // reference at this point. Report the error and abort the command.
+    if (0 == affectedLayersCount) {
+        const std::string error = TfStringPrintf(
+            "Cannot reparent prim \"%s\" because we found no local layer containing it.",
+            srcPrim.GetPath().GetText());
+        TF_WARN("%s", error.c_str());
+        throw std::runtime_error(error);
+    }
 }
 
 static void

lib/usdUfe/utils/layers.cpp

@@ -38,7 +38,7 @@ void getAllSublayers(
         processing.pop_front();
         SdfSubLayerProxy sublayerPaths = layerToProcess->GetSubLayerPaths();
         for (auto path : sublayerPaths) {
-            SdfLayerRefPtr sublayer = SdfLayer::FindOrOpen(path);
+            SdfLayerRefPtr sublayer = SdfLayer::FindRelativeToLayer(layer, path);
             if (sublayer) {
                 if (layerIds)
                     layerIds->insert(path);
@@ -117,34 +117,50 @@ void enforceMutedLayer(const PXR_NS::UsdPrim& prim, const char* command)
     }
 }
 
-void applyToAllPrimSpecs(const UsdPrim& prim, const PrimSpecFunc& func)
+int applyToAllPrimSpecs(const UsdPrim& prim, const PrimSpecFunc& func)
 {
+    int count = 0;
+
     const SdfPrimSpecHandleVector primStack = getLocalPrimStack(prim);
-    for (const SdfPrimSpecHandle& spec : primStack)
+    for (const SdfPrimSpecHandle& spec : primStack) {
         func(prim, spec);
+        ++count;
+    }
+
+    return count;
 }
 
-void applyToAllLayersWithOpinions(const UsdPrim& prim, PrimLayerFunc& func)
+int applyToAllLayersWithOpinions(const UsdPrim& prim, PrimLayerFunc& func)
 {
+    int count = 0;
+
     const SdfPrimSpecHandleVector primStack = getLocalPrimStack(prim);
     for (const SdfPrimSpecHandle& spec : primStack) {
         const auto layer = spec->GetLayer();
         func(prim, layer);
+        ++count;
     }
+
+    return count;
 }
 
-void applyToSomeLayersWithOpinions(
+int applyToSomeLayersWithOpinions(
     const UsdPrim&                  prim,
     const std::set<SdfLayerRefPtr>& layers,
     PrimLayerFunc&                  func)
 {
+    int count = 0;
+
     const SdfPrimSpecHandleVector primStack = getLocalPrimStack(prim);
     for (const SdfPrimSpecHandle& spec : primStack) {
         const auto layer = spec->GetLayer();
         if (layers.count(layer) == 0)
             continue;
         func(prim, layer);
+        ++count;
     }
+
+    return count;
 }
 
 bool isLayerInStage(const PXR_NS::SdfLayerHandle& layer, const PXR_NS::UsdStage& stage)

lib/usdUfe/utils/layers.h

@@ -90,24 +90,26 @@ void enforceMutedLayer(const PXR_NS::UsdPrim& prim, const char* command);
  *
  * @param prim The prim to be modified.
  * @param func The function to be applied.
+ * @return the number of prim specs that were affected.
  */
 
 using PrimSpecFunc = std::function<void(const PXR_NS::UsdPrim&, const PXR_NS::SdfPrimSpecHandle&)>;
 
 USDUFE_PUBLIC
-void applyToAllPrimSpecs(const PXR_NS::UsdPrim& prim, const PrimSpecFunc& func);
+int applyToAllPrimSpecs(const PXR_NS::UsdPrim& prim, const PrimSpecFunc& func);
 
 /**
  * Apply the given function to all the layers that have an opinion about the given prim.
  *
  * @param prim The prim to be modified.
  * @param func The function to be applied.
+ * @return the number of layers that were affected.
  */
 
 using PrimLayerFunc = std::function<void(const PXR_NS::UsdPrim&, const PXR_NS::SdfLayerRefPtr&)>;
 
 USDUFE_PUBLIC
-void applyToAllLayersWithOpinions(const PXR_NS::UsdPrim& prim, PrimLayerFunc& func);
+int applyToAllLayersWithOpinions(const PXR_NS::UsdPrim& prim, PrimLayerFunc& func);
 
 /**
  * Apply the given function to some of the layers that have an opinion about the given prim.
@@ -116,10 +118,11 @@ void applyToAllLayersWithOpinions(const PXR_NS::UsdPrim& prim, PrimLayerFunc& fu
  * @param prim The prim to be modified.
  * @param layers The set of layers that can be affected if they contain an opinion.
  * @param func The function to be applied.
+ * @return the number of layers that were affected.
  */
 
 USDUFE_PUBLIC
-void applyToSomeLayersWithOpinions(
+int applyToSomeLayersWithOpinions(
     const PXR_NS::UsdPrim&                  prim,
     const std::set<PXR_NS::SdfLayerRefPtr>& layers,
     PrimLayerFunc&                          func);

test/lib/ufe/testParentCmd.py

@@ -25,7 +25,7 @@
 
 import mayaUsd.ufe
 
-from pxr import UsdGeom, Vt, Gf, Sdf
+from pxr import UsdGeom, Vt, Gf, Sdf, Usd
 
 from maya import cmds
 from maya import standalone
@@ -275,6 +275,19 @@ def testParentAbsolute(self):
         cylChildren = cylHier.children()
         self.assertEqual(len(cylChildren), 1)
 
+    def testParentRelativeLayer(self):
+        '''
+        Test that parenting in sub-layer that are loaded in relative mode works.
+        '''
+        usdFileName = testUtils.getTestScene('relativeSubLayer', 'root.usda')
+        shapeNode, stage = mayaUtils.createProxyFromFile(usdFileName)
+        self.assertEqual(len(stage.GetRootLayer().subLayerPaths), 1)
+        sublayer = Sdf.Layer.FindRelativeToLayer(stage.GetRootLayer(), stage.GetRootLayer().subLayerPaths[0])
+        with Usd.EditContext(stage, sublayer):
+            cmds.parent(shapeNode + ',/group/geo', shapeNode + ',/group/other')
+        movedCube = stage.GetPrimAtPath('/group/other/geo/cube')
+        self.assertTrue(movedCube)
+
     @unittest.skipUnless(mayaUtils.mayaMajorVersion() >= 2023, 'Requires Maya fixes only available in Maya 2023 or greater.')
     def testParentAbsoluteSingleMatrixOp(self):
         """Test parent -absolute on prim with a single matrix op."""

test/testSamples/relativeSubLayer/root.usda

@@ -0,0 +1,14 @@
+#usda 1.0
+(
+    subLayers = [
+        @sublayer.usda@,
+    ]
+)
+
+# With sub-layer, the hierarchy is group/geo/cube and group/other
+def Xform "group" (
+    kind = "component"
+)
+{
+}
+

test/testSamples/relativeSubLayer/sublayer.usda

@@ -0,0 +1,27 @@
+#usda 1.0
+
+over Xform "group" (
+    kind = "component"
+)
+{
+    double3 xformOp:translate = (5.8646097315075165, 0, 2.156596612263078)
+    uniform token[] xformOpOrder = ["xformOp:translate"]
+
+    def Xform "geo"
+    {
+        def Mesh "cube"
+        {
+            float3[] extent = [(-0.5, -0.5, -0.5), (0.5, 0.5, 0.5)]
+            int[] faceVertexCounts = [4, 4, 4, 4, 4, 4]
+            int[] faceVertexIndices = [0, 1, 3, 2, 2, 3, 5, 4, 4, 5, 7, 6, 6, 7, 1, 0, 1, 7, 5, 3, 6, 0, 2, 4]
+            point3f[] points = [(-0.5, -0.5, 0.5), (0.5, -0.5, 0.5), (-0.5, 0.5, 0.5), (0.5, 0.5, 0.5), (-0.5, 0.5, -0.5), (0.5, 0.5, -0.5), (-0.5, -0.5, -0.5), (0.5, -0.5, -0.5)]
+            color3f[] primvars:displayColor = [(0.4, 0.4, 0.4)]
+            uniform token subdivisionScheme = "none"
+        }
+    }
+
+   def Xform "other"
+   {
+   }
+}
+