Method addSubSurface

src/model/ShadingControl.cpp:421–442

    }

    bool ShadingControl_Impl::addSubSurface(const SubSurface& subSurface) {
      // Check if subSurface already exists
      boost::optional<unsigned> _existingIndex = subSurfaceIndex(subSurface);
      if (_existingIndex) {
        LOG(Warn, "For " << briefDescription() << ", SubSurface already exists.");
        return true;
      }

      bool result;

      auto eg = getObject<ModelObject>().pushExtensibleGroup().cast<WorkspaceExtensibleGroup>();
      bool subsurface = eg.setPointer(OS_ShadingControlExtensibleFields::SubSurfaceName, subSurface.handle());
      if (subsurface) {
        result = true;
      } else {
        // Something went wrong
        // So erase the new extensible group
        getObject<ModelObject>().eraseExtensibleGroup(eg.groupIndex());
        result = false;
      }
      return result;
    }

    bool ShadingControl_Impl::setSubSurfaceIndex(const SubSurface& subSurface, unsigned index) {
      boost::optional<unsigned> idx = subSurfaceIndex(subSurface);