Sorry if asked already, if I puchased a license for Vray for Revit, do I have to pay for vray for Rhino or Sketchup?

We are using three different software for designs. Should we purchase vray for them separately or one license is OK?

Thanks!

You need to get a separate license for each 3D software. You can use the rendernode licenses, included in the license packages in each of them, however.