Subject:
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Re: replacement primitives for fas machines
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 7 Aug 2002 14:25:57 GMT
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Viewed:
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856 times
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In lugnet.cad, Chris Daniel wrote:
> > Hey, Chris! You realize that there are a number of standard 48-sided
> > primitives in your ldraw\p\48\ directory already, right?
>
> Yes I realized the folder was there but I mistook their purpose!
> Oh well maybe I should have asked for some advice before I started : )
Actually, it still would be an interesting project to use the existing
p\48\ files by either (a) copying the files into the p\ directory, or
(b) replacing the regular p\ files with 'pointers' to the p\48\ files.
And there are a lot of files that don't (and probably won't) exist in
standard 48-segment versions.
> Regardless of construction method the outcome should be the same except the
> standard 48 sided primitives are acurate to the ten thousandth decimal place
> where as the ones I constructe are acurate to the one millionth decimal
> place. What decimal place should I go to in the future?
For vertex and position data, 4 decimal places is more than adequate --
there aren't any cases (AFAIK) where we scale primitives by more than
160x. Well, maybe 240x.
For transform data (on linetype 1), you might want to use 6 or 7 decimal
places (or more--I haven't done a lot of testing). Because of the way
these data are used, precise figures are useful to prevent drift.
For official primitive files, 4 decimals places is the standard
recommendation.
Steve
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Message is in Reply To:
 | | Re: replacement primitives for fas machines
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| (...) Yes I realized the folder was there but I mistook their purpose! Oh well maybe I should have asked for some advice before I started : ) Regardless of construction method the outcome should be the same except the standard 48 sided primitives (...) (22 years ago, 7-Aug-02, to lugnet.cad)
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