How to convert iges or step file into 3ds Model

Please tell me how to convert iges or step file into 3ds Model for Proteus-ISIS PCB

thanks in advance

2 Answers

As an open source possibility, use Mesh Lab..(http://meshlab.sourceforge.net/)

Export as an .stl then import into Mesh lab and convert..

Thanks for your answer, i have checked there is no Export in 3DS

thanks for your help