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 CAD / Development / 6734
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Subject: 
Re: LDGLite orientation matrix (l3p enhancement requests?)
Newsgroups: 
lugnet.cad.dev, lugnet.cad.ray
Date: 
Fri, 18 Jan 2002 00:17:58 GMT
Viewed: 
691 times
  
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.

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

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.

4.  POV doesn't like a negative value for angle but you can enter one with
    -ca on the l3p command line.

I have added a check now.
/Lars



Message has 1 Reply:
  Re: LDGLite orientation matrix (l3p enhancement requests?)
 
(...) 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 (...) (23 years ago, 18-Jan-02, to lugnet.cad.dev, lugnet.cad.ray)

Message is in Reply To:
  Re: LDGLite orientation matrix (l3p enhancement requests?)
 
Jacob recently asked for an ldglite enhancement to dump ldglite command line args and POV camera settings which reproduce the current view. I assume he means l3p compatible camera settings. I think I have it working (except for my question about the (...) (23 years ago, 10-Jan-02, to lugnet.cad.dev, lugnet.cad.ray)

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