Subject:
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RE: MLCad *has* no perspective display (was Re: MLCAD wrong perspective display?
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Sat, 15 Sep 2001 15:54:41 GMT
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Reply-To:
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<bram@STOPSPAMpo.cwru.edu>
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Viewed:
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2462 times
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Larry Pieniazek writes:
> In lugnet.cad.mlcad, Damien Guichard writes:
> > No doubts, MLCAD is the best LCAD modeller.
> > However, I use it since version 1.7 and I am still disturbed by
> > display in perspective view. Basically, what is strange is that
> > close things display thiner while distant things display larger.
> > The reverse way would make much more 3D sense. Or his my vision
> > itself reversed?
>
> These 3D views are not perspective views. They are isometric.
>
> In a perspective view, parallel lines not exactly in the plane of
> the viewer eventually intersect (at a vanishing point). This matches
> how we see things in reality, since distant things appear smaller
> to us.
>
> In an isometric view, parallel lines, no matter what direction
> they run with respect to the viewing plane, are parallel.
Since we are so used to seeing things in perspective in real life, the
isometric views can seem strange at times. For a large model we expect it
to get smaller as it goes back, so in an isometric view we "see" it get
bigger when it goes back simply because it's larger than we expect.
Does that make sense?
--Bram
Bram Lambrecht
bram@cwru.edu
http://bldesign.org/
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