Currently matlab has 'orthographic' and 'perspective' for the 'projection'-property of 3-D axes. You can perhaps get a wee bit further using the different camera-settings (CameraViewAngle, CameraPosition, etc) but that seems like a limited option. Your best bet is to roll your own - that is write your own plotting-routines, and then plot with whatever camera-characteristics you need. You will have to manually convert lines in a Cartesian world into curves in your fish-eye image. For points it should be rather simple - just calculate the spherical coordinates phi, theta and r of your points to your "viewing position" and then plot them using your favoured mapping from phi, theta to some "image-coordinates" (u and v say) and then plot everything using u, v and r.
HTH
