Method createGroupNodes

dae2ma/src/DAE2MAGeometryImporter.cpp:1075–1161

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    // --------------------------------------------
    void GeometryImporter::createGroupNodes ( 
        const COLLADAFW::Mesh* mesh,
        size_t& geometryInstanceIndex, 
        const COLLADAFW::UniqueId& transformId, 
        const size_t numNodeInstances,
        const COLLADAFW::UniqueId& controllerId /*= COLLADAFW::UniqueId ()*/ )
    {
        // This method is called for every geometry instance.

        // The maya ascii file.
        FILE* file = getDocumentImporter ()->getFile ();

        // Get the unique id of the current geometry.
        const COLLADAFW::UniqueId& geometryId = mesh->getUniqueId ();

        // Look for a list of componentLists of the current geometry.
        const std::vector<MayaDM::componentList>* componentLists = findComponentLists ( geometryId );
        size_t componentListsCount = 0;
        if ( componentLists ) componentListsCount = componentLists->size ();

        // Create a group for every mesh primitive of every instanciated geometry 
        // and every transform instance, which has a reference to the geometry.
        VisualSceneImporter* visualSceneImporter = getDocumentImporter ()->getVisualSceneImporter ();

        // Get the number of transform node instances.
        size_t numTransformInstances = visualSceneImporter->getNumTransformInstances ( transformId );

        // Iterate over the instances and create the group nodes.
        for ( size_t transformInstanceIndex=0; transformInstanceIndex<numTransformInstances; ++transformInstanceIndex )
        {
            // We have to go through every mesh primitive.
            const COLLADAFW::MeshPrimitiveArray& meshPrimitives = mesh->getMeshPrimitives ();
            size_t meshPrimitivesCount = meshPrimitives.getCount ();

            // We don't need to create groups if we just have one primitive.
            if ( meshPrimitivesCount <= 1 ) return;
            if ( meshPrimitivesCount != componentListsCount )
            {
                std::cerr << "No component lists generated for the current geometry's primitives!" << std::endl;
                return;
            }

            // Create a group for every primitive.
            for ( size_t primitiveIndex=0; primitiveIndex<meshPrimitivesCount; ++primitiveIndex )
            {
                // Get the current mesh primitive shader id
                const COLLADAFW::MeshPrimitive* meshPrimitive = meshPrimitives [primitiveIndex];
                const COLLADAFW::MaterialId shadingEngineId = meshPrimitive->getMaterialId ();

                // Assign the group to the unique geometry id, the transform node 
                // to the mesh instance and the index of the geometry's primitives.
                ShadingBinding shadingBinding ( geometryId, transformId, shadingEngineId, controllerId );
                shadingBinding.setNumInstances ( numNodeInstances );
                shadingBinding.setInstanceIndex ( geometryInstanceIndex );

                // Create the maya groupId object 
                String groupName =  generateUniqueDependNodeName ( GROUP_ID_NAME, true, true );
                MayaDM::GroupId groupId ( file, groupName );