Subject:
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Re: Precision in .DAT files
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 9 Jul 2002 11:52:04 GMT
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Viewed:
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352 times
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In lugnet.cad, Marek Idec writes:
> Dear All,
> I didn't find in LDraw file format specification anything about a precision
> used in co-ordinates and scaling parameters. In most of files I found
> precision maximum 4 digits after decimal point. I'm pretty sure that I saw
> a file with 6 digits precision.
> Are there any formal limitations regarding precision? What is reasonable choice?
>
> Another question related to this subject. If one uses only lines, triangles
> and quads in created part, then is very easy to judge whether there are gaps
> between them or no. What about other primitives used, especialy transformed
> (scalled, rotated etc.)? How to stick other vertices to them? What is the
> maximum distance between two points to be considered as one point?
>
> Regards
>
> Marek Idec
For parts, three decimal places is generally considered acceptable.
Primitives are usually coded with four decimal places of precision, so that
they can be scaled-up by a factor of 10 without degrading the precision
below three decimal places. IMHO, six decimal places is overkill.
Hope this helps, Chris
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Message is in Reply To:
 | | Precision in .DAT files
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| Dear All, I didn't find in LDraw file format specification anything about a precision used in co-ordinates and scaling parameters. In most of files I found precision maximum 4 digits after decimal point. I'm pretty sure that I saw a file with 6 (...) (22 years ago, 9-Jul-02, to lugnet.cad)
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