message: VFRendering: fixed updating of IsosurfaceRenderer when lighting is changed.
  However, the isosurface shadows do not yet react to the light position.
diff: @@ -71,8 +71,11 @@ void IsosurfaceRenderer::optionsHaveChanged(const std::vector<int>& changed_opti
  case Option::VALUE_FUNCTION:
  m_value_function_changed = true;
  break;
  + case Option::LIGHTING_IMPLEMENTATION:
  + case Option::FLIP_NORMALS:
  case View::Option::COLORMAP_IMPLEMENTATION:
  case View::Option::IS_VISIBLE_IMPLEMENTATION:
  + case View::Option::LIGHT_POSITION:
  update_shader = true;
  break;
  }
  