You would require a 3d modeler, but the RTD can "map" what you design on a 3d object.
But in the designer per se, you can design only as long as you create an exploded version of your surface.
For an example of what I mean you can see this thread:
http://support.realtimedesigner.com/forum/read.php?1,5526\
Specifically, the coffee mug sample shows the concept pretty well:
http://designer.realtimedesigner.com/000alexdemo/index.php&tng=Y3BpPTYyMzUxJmN0aT0xNzAzNA==
1st you design the exploded flat version, then you click the "view virtual sample" button to see it applied on a 3d model
