Method GetSurface

src/cpp/web-ifc/geometry/IfcGeometryProcessor.cpp:1286–1672

    }

    IfcSurface IfcGeometryProcessor::GetSurface(uint32_t expressID)
    {
        spdlog::debug("[GetSurface({})]", expressID);
        auto lineType = _loader.GetLineType(expressID);

        // TODO: IfcSweptSurface and IfcBSplineSurface still missing
        switch (lineType)
        {
        case schema::IFCPLANE:
        {
            IfcSurface surface;

            _loader.MoveToArgumentOffset(expressID, 0);
            uint32_t locationID = _loader.GetRefArgument();
            surface.transformation = _geometryLoader.GetLocalPlacement(locationID);

            return surface;
        }
        case schema::IFCBSPLINESURFACE:
        {
            IfcSurface surface;

            std::vector<std::vector<glm::vec<3, glm::f64>>> ctrolPts;

            _loader.MoveToArgumentOffset(expressID, 0);
            int Udegree = _loader.GetIntArgument();

            _loader.MoveToArgumentOffset(expressID, 1);
            int Vdegree = _loader.GetIntArgument();

            _loader.MoveToArgumentOffset(expressID, 2);
            auto ctrlPointGroups = _loader.GetSetListArgument();
            for (auto &set : ctrlPointGroups)
            {
                std::vector<glm::vec<3, glm::f64>> list;
                for (auto &token : set)
                {
                    uint32_t pointId = _loader.GetRefArgument(token);
                    list.push_back(_geometryLoader.GetCartesianPoint3D(pointId));
                }
                ctrolPts.push_back(list);
            }

            _loader.MoveToArgumentOffset(expressID, 3);
            auto curveType = _loader.GetStringArgument();

            _loader.MoveToArgumentOffset(expressID, 4);
            auto closedU = _loader.GetStringArgument();

            _loader.MoveToArgumentOffset(expressID, 5);
            auto closedV = _loader.GetStringArgument();

            _loader.MoveToArgumentOffset(expressID, 6);
            auto selfIntersect = _loader.GetStringArgument();

            surface.BSplineSurface.Active = true;
            surface.BSplineSurface.UDegree = Udegree;
            surface.BSplineSurface.VDegree = Vdegree;