Subject:
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Re: LDGLite orientation matrix (l3p enhancement requests?)
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Newsgroups:
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lugnet.cad.dev, lugnet.cad.ray
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Date:
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Fri, 18 Jan 2002 14:59:56 GMT
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Viewed:
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184 times
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n lugnet.cad.dev, Lars C. Hassing writes:
> Don Heyse wrote...
> > l3p -cc153.501,-190.465,55.321 -cla-12.6792,-14.1397,-6.26938
> > -ca35.4894 m6040.dat -b15
> >
> > I added the last part because I thought it might be better to just
> > dump an l3p command line. But I have a few problems with this.
> >
> > 1. I could use an orthographic option on command line. Is there one?
> > This is handy for generating POV versions of assembly instructions
> > like these: http://www.brickshelf.com/cgi-bin/gallery.cgi?i=94099
>
> Using L3P you can achieve this look by using the -ca option with a small
> angle. See examples in http://home16.inet.tele.dk/hassing/l3p_ca.html
> Using POV's orthographic keyword in the camera definition would require
> another way of calculating the optimum camera position.
> I think one of the great features about L3P is that you always get a good
> view in the first shot.
Well yes, I once compared the orthographic projection to a perspective
projection seen from an infinite distance. I suppose this would give
you an infinitely small camera angle. But you're missing the point.
I'm trying to position ldglite as a cheesy scene modeler for l3p (well
actually Jacob asked for it). I don't just want a good view. I want
an identical view. So I don't want l3p to do *any* of the camera
positioning. Look here to see where I'm going with this:
http://ldglite.sourceforge.net/ldglitepov.html
I *know* you want to do this with l3lab someday so why not just add a
few harmless command line options to l3p now. :-) After all, what's
the harm in passing the orthographic command through but ignoring it
in your camera calculations?
> > 2. I could also use a way to set the sky vector on the command line.
>
> L3P doesn't support tilting the camera (yet :-), simply because I estimated
> it a rare feature. I don't think I have gotten any requests either.
> BTW see http://www.spiritone.com/~english/cyclopedia/sky.html
I'm not sure how you can say you don't support tilting the camera.
What's the default sky vector when I specify a camera location and
look_at point on the l3p command line that aren't in the same y plane?
If I put the camera location directly above the look_at point, what's
the default sky vector?
> > 3. It'd be handy to set PCT on the command line, but if this is too much
> > of a chore I can continue to scale by moving the camera location.
>
> You can by using the -cg option. If the third parameter is negative,
> its absolute value is used as PCT.
> But I may add another option to use together with the -cc option.
That'd be nice, since I want to use the -cc option.
Don
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