Dynamic generate 3D Objects

I have to to generate dynamically an 3D object depending on several input parameters. Some elements inside the Object should be clickable.

Few important things:

• Viewer is Helix
• The generator must be callable from C#
• Generation must be "fast".
• Import of vrml/3ds files (templates/graphic library)
• The Generator must support boolean operations (for example subtract sphere from cube)
• The generator must support things like chamfers or fillets on edges

Optional things:

• Support of animations in 3D Object. (For example animate size change of object)

How would you realize this?