I remember my very first computer 3D model, Autocad had just come out with version 9 ( think it was 9, could have been 10), and it would do real 3D geometry, X, Y and Z. So I drew a profile of a christmas tree made out of about 20 line segments, and revolved into a rudimentary little christmas tree!  The 286 computer autocad was installed at the time huffed and puffed for about 10 minutes creating the revolved surface.   Then you could hide edges, and do some rudimentary shading with it. To shade it, you'd have to run it, go out to lunch and come back. 
That was about the time the first version of Sim City came out, and I was going nutty over it LOL.  I think it was around 1988 or 1989, could have been late '87

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