And what is a 3-D rectangle? Do you mean a bidimensional representation of an otherwise solid object (like an isometric or perspective drawing of a prism), or a rectangle (which is a 2-dimensional, flat object) drawn "skewed" to appear as if it's "rotated around some appropriate axis"?

Anyway, Perl/Tk has a great widget for drawing, Tk::Canvas. For 2-D drawing, that is.

If you really need simulated 3-d, I'd suggest you use OpenGL.

-- 
        dakkar - Mobilis in mobile