I am affraid that you can't make that now inside Moi!

The more easy and funny prog for that is SimLab Composer.
a free version is existing for Real Time and Normal Render (max 1920 * 1080)
Advantage you can mix any 3D Formats - little Primitives Basic Modeling - export in owner's 3D for reload your work!
For export Moi's objects don't take the 3DM format but OBJ + triangles or Ngons
http://www.simlab-soft.com/3d-products/simlab-composer-lite.aspx

Pro versions for objects' animation or more advanced functions (simulations, VR etc)

Here with the free version!
Moi Tuto express


Render SimLab Lite (2 sec)