IECoreUSD::DataAlgo : Add support for SdfAssetPath

Author: johnhaddon

contrib/IECoreUSD/src/IECoreUSD/DataAlgo.cpp

@@ -139,6 +139,11 @@ IECore::DataPtr dataFromArray( const pxr::VtValue &value, GeometricData::Interpr
 	return d;
 }
 
+IECore::DataPtr dataFromSdfAssetPath( const pxr::VtValue &value, GeometricData::Interpretation interpretation, bool arrayAccepted )
+{
+	return new StringData( value.Get<SdfAssetPath>().GetResolvedPath() );
+}
+
 static const std::map<pxr::TfType, IECore::DataPtr (*)( const pxr::VtValue &, GeometricData::Interpretation, bool )> g_fromVtValueConverters = {
 
 	// Numeric types
@@ -202,7 +207,8 @@ static const std::map<pxr::TfType, IECore::DataPtr (*)( const pxr::VtValue &, Ge
 	{ TfType::Find<string>(), &dataFromValue<string> },
 	{ TfType::Find<VtArray<string>>(), &dataFromArray<string> },
 	{ TfType::Find<TfToken>(), &dataFromValue<TfToken> },
-	{ TfType::Find<VtArray<TfToken>>(), &dataFromArray<TfToken> }
+	{ TfType::Find<VtArray<TfToken>>(), &dataFromArray<TfToken> },
+	{ TfType::Find<SdfAssetPath>(), &dataFromSdfAssetPath }
 
 };
 

contrib/IECoreUSD/test/IECoreUSD/USDSceneTest.py

@@ -2938,5 +2938,19 @@ def testHoudiniVaryingLengthArrayPrimVar( self ) :
 			)
 		)
 
+	def testAssetAttributes( self ) :
+
+		root = IECoreScene.SceneInterface.create(
+			os.path.join( os.path.dirname( __file__ ), "data", "assetPathAttribute.usda" ),
+			IECore.IndexedIO.OpenMode.Read
+		)
+		xform = root.child( "xform" )
+
+		self.assertEqual( xform.attributeNames(), [ "render:testAsset" ] )
+		self.assertEqual(
+			xform.readAttribute( "render:testAsset", 0 ),
+			IECore.StringData( os.path.join( os.path.dirname( __file__ ), "data", "cube.usda" ) )
+		)
+
 if __name__ == "__main__":
 	unittest.main()

contrib/IECoreUSD/test/IECoreUSD/data/assetPathAttribute.usda

@@ -0,0 +1,9 @@
+#usda 1.0
+
+def Xform "xform"
+{
+
+	asset primvars:testAsset = @./cube.usda@
+
+}
+