Subject:
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Re: 3D Myst III viewer of a castle
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Newsgroups:
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lugnet.cad.mlcad, lugnet.cad
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Date:
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Fri, 25 Jan 2002 14:58:09 GMT
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Viewed:
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3879 times
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In lugnet.cad, Travis Cobbs writes:
> In lugnet.cad.mlcad, Chuck Sommerville writes:
> > Here is the new simplified camera:
> >
> > camera {
> > spherical
> > location <-320,-239,0> // position
> > look_at <-320,-239,1> // view
> > scale <0,0,-1> // flip it rightside up
> > }
> >
> > I'm not sure why the flip works, or why it is needed. I think it is because
> > or handedness.
>
> I actually had to do something similar in LDView in order to get models to
> view properly using OpenGL (although I used a 180 degree rotation about Z
> followed by one about Y). I wonder if any of the other programmers out
> there had similar trouble getting things to display correctly.
Yes, I'm pretty sure ldglite negates both the y and z coords just before
calling any OpenGL functions. If I remember right, the reason the LDRAW
coordinate system is so odd is because it started out in 2D screen pixel
coords and the 3D view was added later. I wonder if this explains the
weird LDRAW oblique transformation matrix? Was the shearing introduced
to overcome the non-square aspect ratio of the pixels on those old VGA
display modes?
Don
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Message is in Reply To:
 | | Re: 3D Myst III viewer of a castle
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| (...) I actually had to do something similar in LDView in order to get models to view properly using OpenGL (although I used a 180 degree rotation about Z followed by one about Y). I wonder if any of the other programmers out there had similar (...) (23 years ago, 25-Jan-02, to lugnet.cad.mlcad, lugnet.cad)
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