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In lugnet.cad.dat.parts, Don Heyse wrote:
> In lugnet.cad.dat.parts, Don Heyse wrote:
> > Since L3P already supports the LGEO part library, is it possible
> > to just add new LGEO parts and have L3P automatically use them?
> > The only problem I see with this is that the .tab files in the
> > LGEO library are binary files, but the format of the files seem
> > fairly simple. For example, the l2p_elmt.tab file seems to have
> > an entry for each POV .inc element file. These entries consist
> > of a 32 bit counter, an unknown 8 bit number, and a NULL terminated
> > string with the base filename of the .inc file containing the POV
> > code for the element. If we knew what the unknown 8 bit number
> > was, it'd be a fairly simple matter to write a small program to
> > add new elements to the .tab file.
Yes, L3P would automatically support new LGEO parts if they were added
to the binary l2p_elmt.tab.
> Here's a small program to dump the file out as text so we can
> examine the unknown 8 bit value.
You can use the -d option to L3P to see the contents of LGEO's *.TAB files:
l3p -d -lgeo somefile.dat | more
(mentioned a couple of years ago in http://news.lugnet.com/cad/?n=5526 :-)
> It looks to me like it contains
> some flag bits. Only 3 bits seem to be used (0x01, 0x02, and 0x80).
> From the output it appears as if bit 0x80 indicates an element who's
> ldraw part number was moved to a new number. Bit 0x01 seems to
> indicate a slope brick. Perhaps this is a hint to pull use the
> rough texture? I'm not so sure about bit 0x02. It seems to be used
> on parts that may have old versions like the minifig head with a
> solid stud.
I think you got it right. I also had to hack and guess the meaning.
I plan to begin using a plain text version l2p_elmt.txt
because the current binary format is inadequate,
please see http://news.lugnet.com/cad/dev/?n=6041
I didn't do it when I added LGEO support, because I thought Lutz would
still make updates to the LGEO library, and I felt he should take the initiative.
But he has been silent for two years and I think it's time to move on
to the plain text format.
Another possibility is Anton Raves's library.
But it will take a huge effort to get started, because we need a big conversion
table including transformations.
It's easier to add a new part to the LGEO library,
but which library to use, I think will depend on the preference of POV coding style
of the coming POV part authors, LGEO style or Anton Raves style.
http://news.lugnet.com/cad/?n=5525
http://news.lugnet.com/cad/ray/?n=1726
/Lars
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Message has 2 Replies:
 | | Re: POV in Part
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| (...) Are there any significant differences between the two libraries? I assume they both use solid modeling, not surface modeling. I don't think either library offers rounded edges on bricks (something I still miss from the L3G0 library). I've only (...) (21 years ago, 21-Jun-03, to lugnet.cad.dat.parts)
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Message is in Reply To:
| | Re: POV in Part
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| (...) Here's a small program to dump the file out as text so we can examine the unknown 8 bit value. It looks to me like it contains some flag bits. Only 3 bits seem to be used (0x01, 0x02, and 0x80). From the output it appears as if bit 0x80 (...) (21 years ago, 11-Jun-03, to lugnet.cad.dat.parts, lugnet.admin.suggestions)
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