Issue about su2rad

Hi list,
I used the convenient plugin su2rad to build a room model from Sketchup to Radiance. However, when I open the file in Radiance and there is something wrong with its coordinates. As we know, the surface and its normal vector must obey the right hand rule in Radiance while the reality is just the opposite. Anyone who use the same plugin has the similar problem? Or is there any other way to build a correct model not using Radiance? Any advice is appreciated!

I don’t know anything about su2rad, but the xform -I option may be used to reverse surface normals if that’s all you need to fix the output.