Using RT?

Ive been wondering how you start RT for Max? haven’t used max in a while and would like to try RT

You have to assign V-Ray RT as an ActiveShade renderer, switch to that from the Render Setup dialog, and then press the “ActiveShade” button to run it. There is some more information here: Chaos: Industry-leading design and visualization software

Best regards,
Vlado

perfect thanks Vlado!