My university project involves analysis of a small system of atoms. In general, I am writing code to find certain properties of these modelled systems. In my opinion, it would be handy to include some 3d representations of the system. What system would you recommend?

I need:
1. To draw spheres, lines and other simple elements.
2. To be able to make simple UI (rotate, zoom, make slider for time-dependent analysis and etc)
3. To have the model inside Windows Forms Program, maybe inside a control element (would highly simplify the overall outcome). Console Application and UI is not appealing
4. To be able to write this code rather fast - it is just the icing over the cake.

There are some very capable 3D viewers, like VMD. However, I would prefer to make something on my own to have much greater control and more simplified UI.

I was exploring into several possibilities, like Direct 3D or Axiom, but the decision is hard to make without studying these environments in depth, which requires too much time.

What would be your choice?