void Example3_NurbsIn()
{
    std::cout << "loading archive" << std::endl;
    IArchive archive( Alembic::AbcCoreHDF5::ReadArchive(), "nurbs3.abc" );

    std::cout << "making INuPatch object" << std::endl;
    INuPatch myNurbs( IObject( archive, kTop) , "nurbs_surface_withW");

    std::cout << "getting INuPatch schema" << std::endl;
    INuPatchSchema &nurbsSchema = myNurbs.getSchema();

    // get the samples from the curves
    std::cout << "getting INuPatch sample" << std::endl;
    INuPatchSchema::Sample nurbsSample;
    nurbsSchema.get( nurbsSample );

    // test the bounding box

    std::cout << nurbsSample.getSelfBounds().min << std::endl;
    std::cout << nurbsSample.getSelfBounds().max << std::endl;

    TESTING_ASSERT( nurbsSample.getSelfBounds().min == V3d( 0.0, 0.0, -3.0 ) );
    TESTING_ASSERT( nurbsSample.getSelfBounds().max == V3d( 3.0, 3.0, 3.0 ) );

    std::cout << "Number of trim curves: " << nurbsSample.getTrimNumLoops() << std::endl;
    TESTING_ASSERT( nurbsSample.getTrimNumLoops() == 0 );
    TESTING_ASSERT( nurbsSample.hasTrimCurve() == false );
    TESTING_ASSERT( nurbsSample.getPositionWeights()->size() ==
                    ( size_t ) g_nP );
    TESTING_ASSERT( nurbsSchema.isConstant() == true );
}
Beispiel #2
0
/**
 * update patch all
 */
void UMAbcNurbsPatch::update_patch_all()
{
	if (!is_valid()) return;
	ISampleSelector selector(current_time(), ISampleSelector::kNearIndex);
	INuPatchSchema::Sample sample;
	patch_.getSchema().get(sample, selector);

	positions_ = sample.getPositions();
	u_knot_ = sample.getUKnot();
	v_knot_ = sample.getVKnot();
	u_size_ = sample.getNumU();
	v_size_ = sample.getNumV();
	u_order_ = sample.getUOrder();
	v_order_ = sample.getVOrder();
}
Beispiel #3
0
//-*****************************************************************************
void INuPatchDrw::setTime( chrono_t iSeconds )
{
    IObjectDrw::setTime( iSeconds );

    // Use nearest for now.
    ISampleSelector ss( iSeconds, ISampleSelector::kNearIndex );
    INuPatchSchema::Sample nuPatchSample;
    m_nuPatch.getSchema().get( nuPatchSample, ss );

    m_positions = nuPatchSample.getPositions();
    m_uKnot = nuPatchSample.getUKnot();
    m_vKnot = nuPatchSample.getVKnot();
    m_nu = nuPatchSample.getNumU();
    m_nv = nuPatchSample.getNumV();
    m_uOrder = nuPatchSample.getUOrder();
    m_vOrder = nuPatchSample.getVOrder();

    // Update bounds from positions
    m_bounds.makeEmpty();
    if ( m_positions )
    {
        size_t numPoints = m_positions->size();
        for ( size_t p = 0; p < numPoints; ++p )
        {
            m_bounds.extendBy( (*m_positions)[p] );
        }
    }

    // The Object update computed child bounds.
    // Extend them by this.
    /*
    if ( !m_drwHelper.getBounds().isEmpty() )
    {
        m_bounds.extendBy( m_drwHelper.getBounds() );
    }
    */
}
Beispiel #4
0
//-*****************************************************************************
void ProcessNuPatch( INuPatch &patch, ProcArgs &args )
{
    INuPatchSchema &ps = patch.getSchema();
    
    TimeSamplingPtr ts = ps.getTimeSampling();
    
    SampleTimeSet sampleTimes;
    GetRelevantSampleTimes( args, ts, ps.getNumSamples(), sampleTimes );
    
    
    //trim curves are described outside the motion blocks
    if ( ps.hasTrimCurve() )
    {
        //get the current time sample independent of any shutter values
        INuPatchSchema::Sample sample = ps.getValue(
                ISampleSelector( args.frame / args.fps ) );
        
        RiTrimCurve( sample.getTrimNumCurves()->size(), //numloops
                (RtInt*) sample.getTrimNumCurves()->get(),
                (RtInt*) sample.getTrimOrders()->get(),
                (RtFloat*) sample.getTrimKnots()->get(),
                (RtFloat*) sample.getTrimMins()->get(),
                (RtFloat*) sample.getTrimMaxes()->get(),
                (RtInt*) sample.getTrimNumVertices()->get(),
                (RtFloat*) sample.getTrimU()->get(),
                (RtFloat*) sample.getTrimV()->get(),
                (RtFloat*) sample.getTrimW()->get() );
    }
    
    
    bool multiSample = sampleTimes.size() > 1;
    
    if ( multiSample ) { WriteMotionBegin( args, sampleTimes ); }
    
    for ( SampleTimeSet::iterator iter = sampleTimes.begin();
          iter != sampleTimes.end(); ++iter )
    {
        ISampleSelector sampleSelector( *iter );
        
        INuPatchSchema::Sample sample = ps.getValue( sampleSelector );
        
        
        ParamListBuilder paramListBuilder;
        
        //build this here so that it's still in scope when RiNuPatchV is
        //called.
        std::vector<RtFloat> pwValues;
        
        if ( sample.getPositionWeights() )
        {
            if ( sample.getPositionWeights()->size() == sample.getPositions()->size() )
            {
                //need to combine P with weight form Pw
                pwValues.reserve( sample.getPositions()->size() * 4 );
                
                const float32_t * pStart = reinterpret_cast<const float32_t * >(
                        sample.getPositions()->get() );
                const float32_t * wStart = reinterpret_cast<const float32_t * >(
                        sample.getPositionWeights()->get() );
                
                for ( size_t i = 0, e = sample.getPositionWeights()->size();
                        i < e;  ++i )
                {
                    pwValues.push_back( pStart[i*3] );
                    pwValues.push_back( pStart[i*3+1] );
                    pwValues.push_back( pStart[i*3+2] );
                    pwValues.push_back( wStart[i] );
                }
                
                paramListBuilder.add( "Pw", (RtPointer) &pwValues[0] );
            }
        }
        
        if ( pwValues.empty() )
        {
            //no Pw so go straight with P
            paramListBuilder.add( "P",
                    (RtPointer)sample.getPositions()->get() );
        }
        
        ICompoundProperty arbGeomParams = ps.getArbGeomParams();
        AddArbitraryGeomParams( arbGeomParams,
                    sampleSelector, paramListBuilder );
        
        //For now, use the last knot value for umin and umax as it's
        //not described in the alembic data 
        
        RiNuPatchV(
                sample.getNumU(),
                sample.getUOrder(),
                (RtFloat *) sample.getUKnot()->get(),
                0.0, //umin
                sample.getUKnot()->get()[sample.getUKnot()->size()-1],//umax
                sample.getNumV(),
                sample.getVOrder(),
                (RtFloat *) sample.getVKnot()->get(),
                0.0, //vmin
                sample.getVKnot()->get()[sample.getVKnot()->size()-1], //vmax
                paramListBuilder.n(),
                paramListBuilder.nms(),
                paramListBuilder.vals() );
    }
    
    if ( multiSample ) { RiMotionEnd(); }
    
    
}
Beispiel #5
0
//-*****************************************************************************
// a recursive function that reads all inputs and write to the given oObject
// node if there's no gap in the frame range for animated nodes
//
void visitObjects(std::vector< IObject > & iObjects, OObject & oParentObj)
{
    OObject outObj;

    const AbcA::ObjectHeader & header = iObjects[0].getHeader();

    // there are a number of things that needs to be checked for each node
    // to make sure they can be properly stitched together
    //
    // for xform node:
    //      locator or normal xform node
    //      if an xform node, numOps and type of ops match
    //      static or no, and if not, timesampling type matches
    //      if sampled, timesampling type should match
    //      if sampled, no frame gaps
    //
    if (IXform::matches(header))
    {
        OXformSchema oSchema;
        init< IXform,
              IXformSchema,
              OXform,
              OXformSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        ICompoundPropertyVec iCompoundProps;
        iCompoundProps.reserve(iObjects.size());
        ICompoundProperty cp = iObjects[0].getProperties();
        iCompoundProps.push_back(cp);

        bool isLocator = cp.getPropertyHeader("locator")?true:false;

        for (size_t i = 1; i < iObjects.size(); i++)
        {
            ICompoundProperty cp = iObjects[i].getProperties();
            iCompoundProps.push_back(cp);
        }

        // stitch the operations if this is an xform node

        for (size_t i = 0; i < iObjects.size(); i++)
        {
            IXformSchema iSchema =
                IXform(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            index_t numSamples = iSchema.getNumSamples();
            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                XformSample samp = iSchema.getValue(reqIdx);
                oSchema.set(samp);
            }
        }

        // stitch "locator" if it's a locator
        OCompoundProperty oCompoundProp = outObj.getProperties();
        if (isLocator)
        {
            const PropertyHeader * propHeaderPtr =
                iCompoundProps[0].getPropertyHeader("locator");
            stitchScalarProp(*propHeaderPtr,
                             iCompoundProps,
                             oCompoundProp);
        }
    }
    else if (ISubD::matches(header))
    {
        OSubDSchema oSchema;
        init< ISubD,
              ISubDSchema,
              OSubD,
              OSubDSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        // stitch the SubDSchema
        //
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            ISubDSchema iSchema =
                ISubD(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            index_t numSamples = iSchema.getNumSamples();
            IV2fGeomParam uvs = iSchema.getUVsParam();
            if (i == 0 && uvs)
            {
                oSchema.setUVSourceName(GetSourceName(uvs.getMetaData()));
            }
            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                ISubDSchema::Sample iSamp = iSchema.getValue(reqIdx);
                OSubDSchema::Sample oSamp;

                Abc::P3fArraySamplePtr posPtr = iSamp.getPositions();
                if (posPtr)
                    oSamp.setPositions(*posPtr);

                Abc::V3fArraySamplePtr velocPtr = iSamp.getVelocities();
                if (velocPtr)
                    oSamp.setVelocities(*velocPtr);

                Abc::Int32ArraySamplePtr faceIndicesPtr = iSamp.getFaceIndices();
                if (faceIndicesPtr)
                    oSamp.setFaceIndices(*faceIndicesPtr);

                Abc::Int32ArraySamplePtr faceCntPtr = iSamp.getFaceCounts();
                if (faceCntPtr)
                    oSamp.setFaceCounts(*faceCntPtr);

                oSamp.setFaceVaryingInterpolateBoundary(iSamp.getFaceVaryingInterpolateBoundary());
                oSamp.setFaceVaryingPropagateCorners(iSamp.getFaceVaryingPropagateCorners());
                oSamp.setInterpolateBoundary(iSamp.getInterpolateBoundary());

                Abc::Int32ArraySamplePtr creaseIndicesPtr = iSamp.getCreaseIndices();
                if (creaseIndicesPtr)
                    oSamp.setCreaseIndices(*creaseIndicesPtr);

                Abc::Int32ArraySamplePtr creaseLenPtr = iSamp.getCreaseLengths();
                if (creaseLenPtr)
                    oSamp.setCreaseLengths(*creaseLenPtr);

                Abc::FloatArraySamplePtr creaseSpPtr = iSamp.getCreaseSharpnesses();
                if (creaseSpPtr)
                    oSamp.setCreaseSharpnesses(*creaseSpPtr);

                Abc::Int32ArraySamplePtr cornerIndicesPtr = iSamp.getCornerIndices();
                if (cornerIndicesPtr)
                    oSamp.setCornerIndices(*cornerIndicesPtr);

                Abc::FloatArraySamplePtr cornerSpPtr = iSamp.getCornerSharpnesses();
                if (cornerSpPtr)
                    oSamp.setCreaseSharpnesses(*cornerSpPtr);

                Abc::Int32ArraySamplePtr holePtr = iSamp.getHoles();
                if (holePtr)
                    oSamp.setHoles(*holePtr);

                oSamp.setSubdivisionScheme(iSamp.getSubdivisionScheme());

                // set uvs
                IV2fGeomParam::Sample iUVSample;
                OV2fGeomParam::Sample oUVSample;
                if (uvs)
                {
                    getOGeomParamSamp <IV2fGeomParam, IV2fGeomParam::Sample,
                        OV2fGeomParam::Sample>(uvs, iUVSample,
                                               oUVSample, reqIdx);
                    oSamp.setUVs(oUVSample);
                }

                oSchema.set(oSamp);
            }
        }
    }
    else if (IPolyMesh::matches(header))
    {
        OPolyMeshSchema oSchema;
        init< IPolyMesh,
              IPolyMeshSchema,
              OPolyMesh,
              OPolyMeshSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        // stitch the PolySchema
        //
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            IPolyMeshSchema iSchema =
                IPolyMesh(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            index_t numSamples = iSchema.getNumSamples();

            IN3fGeomParam normals = iSchema.getNormalsParam();
            IV2fGeomParam uvs = iSchema.getUVsParam();
            if (i == 0 && uvs)
            {
                oSchema.setUVSourceName(GetSourceName(uvs.getMetaData()));
            }
            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                IPolyMeshSchema::Sample iSamp = iSchema.getValue(reqIdx);
                OPolyMeshSchema::Sample oSamp;

                Abc::P3fArraySamplePtr posPtr = iSamp.getPositions();
                if (posPtr)
                    oSamp.setPositions(*posPtr);

                Abc::V3fArraySamplePtr velocPtr = iSamp.getVelocities();
                if (velocPtr)
                    oSamp.setVelocities(*velocPtr);

                Abc::Int32ArraySamplePtr faceIndicesPtr = iSamp.getFaceIndices();
                if (faceIndicesPtr)
                    oSamp.setFaceIndices(*faceIndicesPtr);

                Abc::Int32ArraySamplePtr faceCntPtr = iSamp.getFaceCounts();
                if (faceCntPtr)
                    oSamp.setFaceCounts(*faceCntPtr);

                // set uvs
                IV2fGeomParam::Sample iUVSample;
                OV2fGeomParam::Sample oUVSample;
                if (uvs)
                {
                    getOGeomParamSamp <IV2fGeomParam, IV2fGeomParam::Sample,
                        OV2fGeomParam::Sample>(uvs, iUVSample,
                                               oUVSample, reqIdx);
                    oSamp.setUVs(oUVSample);
                }

                // set normals
                IN3fGeomParam::Sample iNormalsSample;
                ON3fGeomParam::Sample oNormalsSample;
                if (normals)
                {
                    getOGeomParamSamp <IN3fGeomParam, IN3fGeomParam::Sample,
                        ON3fGeomParam::Sample>(normals, iNormalsSample,
                                               oNormalsSample, reqIdx);
                    oSamp.setNormals(oNormalsSample);
                }

                oSchema.set(oSamp);
            }
        }
    }
    else if (ICamera::matches(header))
    {
        OCameraSchema oSchema;
        init< ICamera,
              ICameraSchema,
              OCamera,
              OCameraSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        // stitch the CameraSchemas
        //
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            ICameraSchema iSchema =
                ICamera(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            index_t numSamples = iSchema.getNumSamples();
            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                oSchema.set(iSchema.getValue(reqIdx));
            }
        }
    }
    else if (ICurves::matches(header))
    {
        OCurvesSchema oSchema;
        init< ICurves,
              ICurvesSchema,
              OCurves,
              OCurvesSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        // stitch the CurvesSchemas
        //
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            ICurvesSchema iSchema =
                ICurves(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            IV2fGeomParam iUVs = iSchema.getUVsParam();
            IN3fGeomParam iNormals = iSchema.getNormalsParam();
            IFloatGeomParam iWidths = iSchema.getWidthsParam();
            IFloatArrayProperty iKnots = iSchema.getKnotsProperty();
            IUcharArrayProperty iOrders = iSchema.getOrdersProperty();

            index_t numSamples = iSchema.getNumSamples();

            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                ICurvesSchema::Sample iSamp = iSchema.getValue(reqIdx);

                OCurvesSchema::Sample oSamp;
                Abc::P3fArraySamplePtr posPtr = iSamp.getPositions();
                if (posPtr)
                    oSamp.setPositions(*posPtr);

                Abc::V3fArraySamplePtr velocPtr = iSamp.getVelocities();
                if (velocPtr)
                    oSamp.setVelocities(*velocPtr);

                oSamp.setType(iSamp.getType());
                Abc::Int32ArraySamplePtr curvsNumPtr = iSamp.getCurvesNumVertices();
                if (curvsNumPtr)
                    oSamp.setCurvesNumVertices(*curvsNumPtr);
                oSamp.setWrap(iSamp.getWrap());
                oSamp.setBasis(iSamp.getBasis());

                Abc::FloatArraySamplePtr knotsPtr = iSamp.getKnots();
                if (knotsPtr)
                {
                    oSamp.setKnots(*knotsPtr);
                }

                Abc::UcharArraySamplePtr ordersPtr = iSamp.getOrders();
                if (ordersPtr)
                {
                    oSamp.setOrders(*ordersPtr);
                }

                IFloatGeomParam::Sample iWidthSample;
                OFloatGeomParam::Sample oWidthSample;
                if (iWidths)
                {
                    getOGeomParamSamp <IFloatGeomParam, IFloatGeomParam::Sample,
                        OFloatGeomParam::Sample>(iWidths, iWidthSample,
                                                 oWidthSample, reqIdx);
                    oSamp.setWidths(oWidthSample);
                }

                IV2fGeomParam::Sample iUVSample;
                OV2fGeomParam::Sample oUVSample;
                if (iUVs)
                {
                    getOGeomParamSamp <IV2fGeomParam, IV2fGeomParam::Sample,
                        OV2fGeomParam::Sample>(iUVs, iUVSample,
                                               oUVSample, reqIdx);
                    oSamp.setUVs(oUVSample);
                }

                IN3fGeomParam::Sample iNormalsSample;
                ON3fGeomParam::Sample oNormalsSample;
                if (iNormals)
                {
                    getOGeomParamSamp <IN3fGeomParam, IN3fGeomParam::Sample,
                        ON3fGeomParam::Sample>(iNormals, iNormalsSample,
                                               oNormalsSample, reqIdx);
                    oSamp.setNormals(oNormalsSample);
                }

                oSchema.set(oSamp);
            }
        }
    }
    else if (IPoints::matches(header))
    {
        OPointsSchema oSchema;
        init< IPoints,
              IPointsSchema,
              OPoints,
              OPointsSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        // stitch the PointsSchemas
        //
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            IPointsSchema iSchema =
                IPoints(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            IFloatGeomParam iWidths = iSchema.getWidthsParam();
            index_t numSamples = iSchema.getNumSamples();
            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                IPointsSchema::Sample iSamp = iSchema.getValue(reqIdx);
                OPointsSchema::Sample oSamp;
                Abc::P3fArraySamplePtr posPtr = iSamp.getPositions();
                if (posPtr)
                    oSamp.setPositions(*posPtr);
                Abc::UInt64ArraySamplePtr idPtr = iSamp.getIds();
                if (idPtr)
                    oSamp.setIds(*idPtr);
                Abc::V3fArraySamplePtr velocPtr = iSamp.getVelocities();
                if (velocPtr)
                    oSamp.setVelocities(*velocPtr);

                IFloatGeomParam::Sample iWidthSample;
                OFloatGeomParam::Sample oWidthSample;
                if (iWidths)
                {
                    getOGeomParamSamp <IFloatGeomParam, IFloatGeomParam::Sample,
                        OFloatGeomParam::Sample>(iWidths, iWidthSample,
                                                 oWidthSample, reqIdx);
                    oSamp.setWidths(oWidthSample);
                }

                oSchema.set(oSamp);
            }
        }
    }
    else if (INuPatch::matches(header))
    {
        ONuPatchSchema oSchema;
        init< INuPatch,
              INuPatchSchema,
              ONuPatch,
              ONuPatchSchema >(iObjects, oParentObj, oSchema);
        outObj = oSchema.getObject();

        // stitch the NuPatchSchemas
        //
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            INuPatchSchema iSchema =
                INuPatch(iObjects[i], Alembic::Abc::kWrapExisting).getSchema();
            index_t numSamples = iSchema.getNumSamples();

            IN3fGeomParam normals = iSchema.getNormalsParam();
            IV2fGeomParam uvs = iSchema.getUVsParam();

            index_t reqIdx = getIndexSample(oSchema.getNumSamples(),
                oSchema.getTimeSampling(), numSamples,
                iSchema.getTimeSampling());
            for (; reqIdx < numSamples; reqIdx++)
            {
                INuPatchSchema::Sample iSamp = iSchema.getValue(reqIdx);
                ONuPatchSchema::Sample oSamp;

                Abc::P3fArraySamplePtr posPtr = iSamp.getPositions();
                if (posPtr)
                    oSamp.setPositions(*posPtr);

                Abc::V3fArraySamplePtr velocPtr = iSamp.getVelocities();
                if (velocPtr)
                    oSamp.setVelocities(*velocPtr);

                oSamp.setNu(iSamp.getNumU());
                oSamp.setNv(iSamp.getNumV());
                oSamp.setUOrder(iSamp.getUOrder());
                oSamp.setVOrder(iSamp.getVOrder());

                Abc::FloatArraySamplePtr uKnotsPtr = iSamp.getUKnot();
                if (uKnotsPtr)
                    oSamp.setUKnot(*uKnotsPtr);

                Abc::FloatArraySamplePtr vKnotsPtr = iSamp.getVKnot();
                if (vKnotsPtr)
                    oSamp.setVKnot(*vKnotsPtr);

                IV2fGeomParam::Sample iUVSample;
                OV2fGeomParam::Sample oUVSample;
                if (uvs)
                {
                    getOGeomParamSamp <IV2fGeomParam, IV2fGeomParam::Sample,
                        OV2fGeomParam::Sample>(uvs, iUVSample,
                                               oUVSample, reqIdx);
                    oSamp.setUVs(oUVSample);
                }

                IN3fGeomParam::Sample iNormalsSample;
                ON3fGeomParam::Sample oNormalsSample;
                if (normals)
                {
                    getOGeomParamSamp <IN3fGeomParam, IN3fGeomParam::Sample,
                        ON3fGeomParam::Sample>(normals, iNormalsSample,
                                               oNormalsSample, reqIdx);
                    oSamp.setNormals(oNormalsSample);
                }


                if (iSchema.hasTrimCurve())
                {
                    oSamp.setTrimCurve(iSamp.getTrimNumLoops(),
                                       *(iSamp.getTrimNumCurves()),
                                       *(iSamp.getTrimNumVertices()),
                                       *(iSamp.getTrimOrders()),
                                       *(iSamp.getTrimKnots()),
                                       *(iSamp.getTrimMins()),
                                       *(iSamp.getTrimMaxes()),
                                       *(iSamp.getTrimU()),
                                       *(iSamp.getTrimV()),
                                       *(iSamp.getTrimW()));
                }
                oSchema.set(oSamp);
            }
        }
    }
    else
    {
        outObj = OObject(oParentObj, header.getName(), header.getMetaData());

        // collect the top level compound property
        ICompoundPropertyVec iCompoundProps(iObjects.size());
        for (size_t i = 0; i < iObjects.size(); i++)
        {
            iCompoundProps[i] = iObjects[i].getProperties();
        }

        OCompoundProperty oCompoundProperty = outObj.getProperties();
        stitchCompoundProp(iCompoundProps, oCompoundProperty);
    }

    // After done writing THIS OObject node, if input nodes have children,
    // go deeper.
    // Otherwise we are done here
    size_t numChildren =  iObjects[0].getNumChildren();

    // check to make sure all of our iObjects have the same number of children
    for (size_t j = 1; j < iObjects.size(); j++)
    {
        if (numChildren != iObjects[j].getNumChildren())
        {
            std::cerr << "ERROR: " << iObjects[j].getFullName() << " in " <<
                iObjects[j].getArchive().getName() <<
                " has a different number of children than " <<
                iObjects[0].getFullName() << " in " <<
                iObjects[0].getArchive().getName() << std::endl;

            exit(1);
        }
    }

    for (size_t i = 0 ; i < numChildren; i++ )
    {
        std::vector< IObject > iChildObjects;
        for (size_t f = 0; f < iObjects.size(); f++)
        {
            iChildObjects.push_back(iObjects[f].getChild(i));
        }
        visitObjects(iChildObjects, outObj);
    }

}