Rendering is different from exporting. When a render is calculated you end up with a 2D representation of your scene, an image.
An export means select geometry and accompanying data is essentially translated into a specific format, one different from the native Rhino format.
A program, i.e. Iris, that imports such exported data will draw that in its own way.
Rendering with a render engine like V-Ray, or Cycles, or any other one, won’t affect the export result.
Hopefully that clears the confusion.
/Nathan