SceneCacheFileFormat : Create the pseudo-root spec in InitData

Changes

@@ -1,7 +1,10 @@
 10.7.x.x (relative to 10.7.1.3)
 ========
 
+Fixes
+-----
 
+- SceneCacheFileFormat : Fixed `Unsupported Spec Type for </>` error when a scene cache is added as a sublayer of a live stage.
 
 10.7.1.3 (relative to 10.7.1.2)
 ========

contrib/IECoreUSD/src/IECoreUSD/SceneCacheFileFormat.cpp

@@ -111,7 +111,10 @@ UsdSceneCacheFileFormat::~UsdSceneCacheFileFormat()
 
 SdfAbstractDataRefPtr UsdSceneCacheFileFormat::InitData( const FileFormatArguments& args ) const
 {
-    return SceneCacheData::New( args );
+    SceneCacheDataRefPtr data = SceneCacheData::New( args );
+    // The pseudo-root spec must always exist in a layer's data.
+    data->CreateSpec( SdfPath::AbsoluteRootPath(), SdfSpecTypePseudoRoot );
+    return data;
 }
 
 

contrib/IECoreUSD/test/IECoreUSD/SceneCacheFileFormatTest.py

@@ -40,6 +40,7 @@
 
 import pxr.Usd
 import pxr.Sdf
+import pxr.Tf
 
 import imath
 
@@ -1263,5 +1264,22 @@ def testCustomAttribute( attribute ):
 		self.assertTrue( primitiveVariable )
 		self.assertEqual( primitiveVariable.interpolation, IECoreScene.PrimitiveVariable.Interpolation.Constant )
 
+	def testSubLayerIntoLiveStage( self ) :
+		fileName = os.path.join( self.temporaryDirectory(), "testUSDSubLayer.scc" )
+		m = IECoreScene.SceneCache( fileName, IECore.IndexedIO.OpenMode.Write )
+		t = m.createChild( "t" )
+		del m, t
+
+		root = pxr.Sdf.Layer.CreateAnonymous( ".usda" )
+		stage = pxr.Usd.Stage.Open( root )
+
+		mark = pxr.Tf.Error.Mark()
+		mark.SetMark()
+		root.subLayerPaths.append( fileName )
+		self.assertTrue( mark.IsClean() )
+
+		self.assertTrue( stage.GetPrimAtPath( "/__IECOREUSD_ROOT/t" ) )
+
+
 if __name__ == "__main__":
 	unittest.main()