Given an object, e.g.

t = 0:pi/10:2*pi;
[X,Y,Z] = cylinder(2+cos(t));
surf(X,Y,Z)
axis square

After moving it around, rotating, etc. I want to hit enter and the 
next image be a 2D plot of the outline of the object as it appeared 
on the screen. 

Basically, take what the object looks like on the screen right now, 
put a 2D grid of the plane on the screen and (assuming axis square) 
find the outlining points.
Is there a simple code?

Thanks,

-MIke