Method writeObjectGroups

dae2ma/src/DAE2MAGeometryImporter.cpp:1164–1237

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    // --------------------------------------------
    void GeometryImporter::writeObjectGroups ( 
        const COLLADAFW::Mesh* mesh, 
        MayaDM::Mesh &meshNode,
        const COLLADAFW::UniqueId& transformNodeId )
    {
        // Create the object group instances and the object groups and write it into the maya file.
        VisualSceneImporter* visualSceneImporter = getDocumentImporter ()->getVisualSceneImporter ();

        // setAttr -size 2 ".instObjGroups"; // for every instance
        // setAttr -size 2 ".instObjGroups[0].objectGroups"; // for every mesh primitive
        // setAttr ".instObjGroups[0].objectGroups[0].objectGrpCompList" -type "componentList" 1 "f[0:5]";
        // setAttr ".instObjGroups[0].objectGroups[1].objectGrpCompList" -type "componentList" 1 "f[6:11]";

        // We have to go through every mesh primitive.
        const COLLADAFW::MeshPrimitiveArray& meshPrimitives = mesh->getMeshPrimitives ();
        size_t meshPrimitivesCount = meshPrimitives.getCount ();

        // We don't need this, if we have just one primitive.
        if ( meshPrimitivesCount <= 1 ) return;

        // For every geometry instance
        //  For every transform instance
        //      For every mesh primitive 
        //          addAttr (objectGrpCompList)

        const COLLADAFW::UniqueId& geometryId = mesh->getUniqueId ();
        size_t globalInstanceCount = 0;

        // Count the geometry instances.
        const UniqueIdVec* geometryInstanceTransformIds = visualSceneImporter->findGeometryTransformIds ( geometryId );
        if ( geometryInstanceTransformIds )
        {
            size_t numGeometryInstancesTransformIds = geometryInstanceTransformIds->size ();
            for ( size_t n=0; n<numGeometryInstancesTransformIds; ++n )
            {
                // Count the transform node instances, which have the geometry as a child.
                const COLLADAFW::UniqueId& currentTransformNodeId = (*geometryInstanceTransformIds) [n];
                size_t numTransformNodeInstances = visualSceneImporter->getNumTransformInstances ( currentTransformNodeId );
                globalInstanceCount += numTransformNodeInstances;
            }
        }

        // Iterate over the mesh primitives
        size_t initialFaceIndex = 0;
        for ( size_t i=0; i<meshPrimitivesCount; ++i )
        {
            // Get the number of faces of the current primitive element.
            const COLLADAFW::MeshPrimitive* meshPrimitive = meshPrimitives [ i ];
            size_t numFaces = meshPrimitive->getFaceCount ();

            // Create the string with the face informations for the component list.
            String val = "f[" + COLLADABU::Utils::toString ( initialFaceIndex ) 
                + ":" + COLLADABU::Utils::toString ( numFaces-1 + initialFaceIndex ) + "]";

            // Create the component list.
            MayaDM::componentList componentList;
            componentList.push_back ( val );