Subject:
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Re: ldglite (ldlite for OpenGL and Linux) new stuff
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 4 Feb 2000 20:31:57 GMT
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Viewed:
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3071 times
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Paul:
[ Tells us that we are behaving a little bit silly. ]
You are probably right, but...
I think that the main problem is that practically none of us
are experienced CAD developers or users.
Some of Paul's points:
- Different coordinate systems
I don't know how many there are, but since I find the choice
in LDraw strange, I can understand people that choose an
alternative in later programs (despite the sillyness of it).
- Naming conventions
What other "naming" conventions than part numbers are used?
- Adding a .DAT file primitive to POV
You mean make povray able to read .DAT files directly? I
think too many of us are too used to binary-only
distributions.
- Using POV "modellers"
This sounds like a sensible possibility. I presume that they
are much more versatile than LEdit and the other LEGO
oriented CAD editors. Is that true?
Personally I dislike graphical drawing tools, even though I
like graphical feedback when I edit LDraw and Postscript
files, so I doubt that a typical "modeller" is the right
tool for me (but I have never claimed to be ordinary).
We should also remember that even though POV is a good
raytracer, it is horrible for building instructions. We will
still need a tool that can convert our files to LEGO style
building instructions.
If we choose to abandon the current LDraw editing tools and
switch to POV, we will need to write a renderer based on a
much more complicated file format (POV). This could be quite
difficult, and I suspect that making a LDraw "modeller"
would be easier than to make an instruction renderer that
reads POV files.
Play well,
Jacob
------------------------------------------------------------
-- E-mail: sparre@cats.nbi.dk --
-- Web...: <URL: http://hugin.ldraw.org/LEGO/Dyr/ > --
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Message has 2 Replies:
 | | Re: ldglite (ldlite for OpenGL and Linux) new stuff
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| (...) And earlier programs. BriCAD, L3G0, Ben's (?) POV library, VBLOCKs (an SGI GL program) and I think LegoPS (postscript) used different coordinates & units. Or at least they were all different from L3G0. (...) L3G0 call a brick a "b2x4"; BriCAD (...) (25 years ago, 5-Feb-00, to lugnet.cad.dev)
| | | Re: ldglite (ldlite for OpenGL and Linux) new stuff
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| Paul: (...) Yes (what a mess). As a mathematician and physicist I prefer right-hand rectangular coordinate systems with the first two coordinates (x and y) in the plane and the last coordinate (z) having the positive direction up. The units should (...) (25 years ago, 6-Feb-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: ldglite (ldlite for OpenGL and Linux) new stuff
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| Leonardo, you are better than most, perhaps the best at contributing. The comment was not directed at you, but at the idea that publishing source would reduce the number of incompatible/redundant CAD tools. There is something disfunctional about the (...) (25 years ago, 3-Feb-00, to lugnet.cad.dev)
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