[metapost] Redefine ..

[Troy Henderson]

>
> All in all, I'd vote for Troy's inital attempt. i.e.,
> the defining of a  3D --> 2D function and apply it to every node.


Well, ultimately, I would like to see this as part of MetaPost itself.  It
would be nice if MetaPost could handle 3D (perspective and orthographic,
but AT LEAST orthographic projections) internally, and I am trying to
develop code for Taco to be able to implement.

Luís Gonçalves (Featpost) and I have discussed this, and it is clear that a
3D implementation should, at least, provide paths of triplets (which is not
currently available).  The technique that I have been using where I simply
construct paths like

p:=P(1,2,3)..P(4,5,6)..P(7,8,9);

is the only way that I have been able to draw 3D paths, although the paths
are not truly 3D (in that they have already been projected), and thus any
manipulation in 3D cannot be performed.

Troy
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