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If you need a real 3D (not only a viewer...or little more) you have to try : www.turbocad.com (quite good and relative low price) www.solidworks.com (very good but expensive) www.solidEdge.com (very good but expensive)
or if you have Cadstar directly access to Cadstar 3D tool.
Otherwise if you need only to show the PCB on 3D (or little more...) you have to try:
cadint.se .... and so on