IECoreUSD : Add SceneAlgo::sceneFromStage

contrib/IECoreUSD/include/IECoreUSD/SceneAlgo.h

@@ -0,0 +1,59 @@
+//////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (c) 2021, Image Engine Design Inc. All rights reserved.
+//
+//  Redistribution and use in source and binary forms, with or without
+//  modification, are permitted provided that the following conditions are
+//  met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//
+//     * Neither the name of Image Engine Design nor the names of any
+//       other contributors to this software may be used to endorse or
+//       promote products derived from this software without specific prior
+//       written permission.
+//
+//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+//  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+//  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+//  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+//  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+//  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+//  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+//  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+//  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+//  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////
+
+#ifndef IECOREUSD_SCENEALGO_H
+#define IECOREUSD_SCENEALGO_H
+
+#include "IECoreUSD/Export.h"
+
+#include "IECoreScene/SceneInterface.h"
+
+IECORE_PUSH_DEFAULT_VISIBILITY
+#include "pxr/usd/usd/stage.h"
+IECORE_POP_DEFAULT_VISIBILITY
+
+namespace IECoreUSD
+{
+
+namespace SceneAlgo
+{
+
+/// Wrap a UsdStage into a Cortex SceneInterface
+IECOREUSD_API IECoreScene::SceneInterfacePtr sceneFromStage( const pxr::UsdStageRefPtr &stage );
+
+} // namespace SceneAlgo
+
+} // namespace IECoreUSD
+
+#endif // IECOREUSD_SCENEALGO_H

contrib/IECoreUSD/src/IECoreUSD/SceneAlgo.cpp

@@ -0,0 +1,47 @@
+//////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (c) 2021, Image Engine Design Inc. All rights reserved.
+//
+//  Redistribution and use in source and binary forms, with or without
+//  modification, are permitted provided that the following conditions are
+//  met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//
+//     * Neither the name of Image Engine Design nor the names of any
+//       other contributors to this software may be used to endorse or
+//       promote products derived from this software without specific prior
+//       written permission.
+//
+//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+//  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+//  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+//  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+//  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+//  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+//  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+//  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+//  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+//  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////
+
+#include "IECoreUSD/SceneAlgo.h"
+#include "IECoreUSD/USDScene.h"
+
+using namespace std;
+using namespace pxr;
+using namespace IECore;
+using namespace IECoreScene;
+using namespace IECoreUSD;
+
+SceneInterfacePtr IECoreUSD::SceneAlgo::sceneFromStage( const pxr::UsdStageRefPtr &stage )
+{
+	return new USDScene( stage );
+}

contrib/IECoreUSD/src/IECoreUSD/USDScene.cpp

@@ -361,8 +361,13 @@ class USDScene::IO : public RefCounted
 					throw Exception( "Unsupported OpenMode" );
 			}
 
-			m_timeCodesPerSecond = m_stage->GetTimeCodesPerSecond();
-			m_rootPrim = m_stage->GetPseudoRoot();
+			initStage();
+		}
+
+		IO( const pxr::UsdStageRefPtr &stage, IndexedIO::OpenMode openMode )
+			: m_fileName( "" ), m_openMode( openMode ), m_stage( stage )
+		{
+			initStage();
 		}
 
 		~IO() override
@@ -377,6 +382,12 @@ class USDScene::IO : public RefCounted
 			}
 		}
 
+		void initStage()
+		{
+			m_timeCodesPerSecond = m_stage->GetTimeCodesPerSecond();
+			m_rootPrim = m_stage->GetPseudoRoot();
+		}
+
 		const std::string &fileName() const
 		{
 			return m_fileName;
@@ -448,6 +459,12 @@ USDScene::USDScene( const std::string &fileName, IndexedIO::OpenMode openMode )
 {
 }
 
+USDScene::USDScene( const pxr::UsdStageRefPtr &stage )
+	:	m_root( new IO( stage, IndexedIO::Read ) ),
+		m_location( new Location( m_root->root() ) )
+{
+}
+
 USDScene::USDScene( IOPtr io, LocationPtr location )
 	:	m_root( io ), m_location( location )
 {

contrib/IECoreUSD/src/IECoreUSD/USDScene.h

@@ -41,6 +41,10 @@
 
 #include "IECore/PathMatcherData.h"
 
+IECORE_PUSH_DEFAULT_VISIBILITY
+#include "pxr/usd/usd/stage.h"
+IECORE_POP_DEFAULT_VISIBILITY
+
 namespace IECoreUSD
 {
 
@@ -49,6 +53,7 @@ class USDScene : public IECoreScene::SceneInterface
 	public:
 		IE_CORE_DECLARERUNTIMETYPEDEXTENSION( USDScene, IECoreUSD::USDSceneTypeId, IECoreScene::SceneInterface )
 		USDScene( const std::string &path, IECore::IndexedIO::OpenMode mode );
+		explicit USDScene( const pxr::UsdStageRefPtr &stage );
 
 		~USDScene() override;
 

contrib/IECoreUSD/src/IECoreUSD/bindings/IEUSDModule.cpp

@@ -34,6 +34,18 @@
 
 #include "boost/python.hpp"
 
+#include "IECoreUSD/SceneAlgo.h"
+
+using namespace boost::python;
+using namespace IECoreUSD;
+
 BOOST_PYTHON_MODULE( _IECoreUSD )
 {
+	{
+		object module( borrowed( PyImport_AddModule( "IECoreUSD.SceneAlgo" ) ) );
+		scope().attr( "SceneAlgo" ) = module;
+		scope moduleScope( module );
+
+		def( "sceneFromStage", &SceneAlgo::sceneFromStage );
+	}
 }

contrib/IECoreUSD/test/IECoreUSD/USDSceneTest.py

@@ -2320,5 +2320,48 @@ def testSkelBlendShapes( self ) :
 			self.assertAlmostEqual( arm_10["P"].data[i].y, expected_10[i].y, 5 )
 			self.assertAlmostEqual( arm_10["P"].data[i].z, expected_10[i].z, 5 )
 
+	def testSceneFromStage( self ) :
+
+		stage = pxr.Usd.Stage.CreateInMemory()
+		pxr.UsdGeom.Xform.Define( stage, "/a" )
+		pxr.UsdGeom.Camera.Define( stage, "/a/c" )
+		stage.OverridePrim( "/a/b" ).GetReferences().AddReference( os.path.join( os.path.dirname( __file__ ), "data", "cube.usda" ), "/pCube1" )
+
+		scene = IECoreUSD.SceneAlgo.sceneFromStage( stage )
+		self.assertEqual( scene.childNames(), [ "a" ] )
+
+		a = scene.child( "a" )
+		self.assertEqual( set( a.childNames() ), { "b", "c" } )
+
+		b = a.child( "b" )
+		self.assertEqual( b.childNames(), [] )
+		self.assertEqual( b.hasObject(), True )
+		refScene = IECoreScene.SceneInterface.create( os.path.join( os.path.dirname( __file__ ), "data", "cube.usda" ),  IECore.IndexedIO.OpenMode.Read )
+		refCube = refScene.child( "pCube1" )
+		self.assertEqual( b.readObject( 0 ), refCube.readObject( 0 ) )
+
+		c = a.child( "c" )
+		self.assertEqual( c.childNames(), [] )
+		self.assertEqual( c.hasObject(), True )
+		refCam = IECoreScene.Camera()
+		refCam.setProjection( "perspective" )
+		refCam.setFocalLength( 50 )
+		refCam.setAperture( imath.V2f( 20.9549999, 15.2908001 ) )
+		refCam.setApertureOffset( imath.V2f( 0, 0 ) )
+		refCam.setClippingPlanes( imath.V2f( 1, 1000000 ) )
+		refCam.setFocalLengthWorldScale( 0.1 )
+		refCam.setFocusDistance( 0 )
+		refCam.setFStop( 0 )
+		refCam.setShutter( imath.V2f( 0, 0 )  )
+		self.assertEqual( c.readObject( 0 ), refCam )
+
+		# change the stage
+		stage.OverridePrim( "/a/d" ).GetReferences().AddReference( os.path.join( os.path.dirname( __file__ ), "data", "cube.usda" ), "/pCube1" )
+		self.assertEqual( set( a.childNames() ), { "b", "c", "d" } )
+		d = a.child( "d" )
+		self.assertEqual( d.childNames(), [] )
+		self.assertEqual( d.hasObject(), True )
+		self.assertEqual( d.readObject( 0 ), refCube.readObject( 0 ) )
+
 if __name__ == "__main__":
 	unittest.main()