Subject:
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Re: DAT format question
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 20 Sep 1999 16:24:23 GMT
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Viewed:
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351 times
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On Sun, 19 Sep 1999 01:26:13 GMT, "Gary Williams" <graywolf@pcpros.net>
wrote:
> Er, let me clarify that.
>
> Do any of the existing part files have references to external parts other
> than primitives?
Check part 3149C01.DAT. This is a "compound" part, a part which is really
available from TLG, but it is made up of several different parts which are
also available (in LDraw) for use as separate parts.
There are also files, which aren't parts available from TLG, but are
provided for convenience. These files place several parts together in
their common association. See 979.DAT.
There are also files, any file where the part title starts with an
underscore, which provide information about parts where the known TLG part
numbers refers to the part with specific coloring, decorations, or
post-mold processing. See 73485.DAT. Contrast this with parts like the
2x4 brick, where 3001 is known to be an actual TLG number for the part in
any color. These files typically reference a corresponding part-file with
generic coloring for the part.
These types of files are collectively known as "shortcut" files.
The parts\s\ directory is provided for the convenience of parts-authors, to
allow multi-file parts without cluttering the parts\ directory. Multi-file
parts are needed when a dithered color is used in the part. Multi-file
parts are useful for reducing overall file size, and to allow reuse of
part-specific sections.
The difference between sub-parts and primitives is a question of the
generallity of the file. A file which can be used in three different parts
belongs in parts\s\. A file which can be used in a lot of different parts
belongs in p\, especially if it can be easily described in geometric terms
("a circle", "a box with some missing sides", etc).
Steve
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