Subject:
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Re: Part building advice - too many triangles/quads?
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Fri, 26 Nov 2004 06:36:20 GMT
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Viewed:
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4176 times
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Thanks everyone for the advice. After posting last night I went ahead and
changed the hat puff to a 1/8 segment and called it s/6898s1_8.dat. Any
conditional lines falling along the x, z, x+z (diagonal), or x-z axes were moved
into the main file to avoid some of the concerns I had with mirroring. Then all
the ones that required mirroring (rather than mere rotation) were BFC inverted.
(I could have rotated by 45 degrees instead of mirroring, but I knew it’d be
better to stick with exact numbers.)
I also decided to add the sloped bottom to the hat. The quads I put in for the
bottom edge now have 5-digit precision on the y axis, only because I wanted to
be absolutely sure they’d merge correctly with a sheared 4-4edge.dat primitive.
But there are only 16 of those quads, so I decided to forgo that precision
elsewhere. This slope is oriented so that it’s longer in the back (back being
the +z direction, since heads normally face -z).
Chris, I took your advice on the 3-digit accuracy and rounded off every
coordinate that doesn’t connect to a primitive. Fortunately there are only 6 of
those primitive connection points for the 1/8 subpart, and 2 of them already use
integer values. (The puff connects to the button on top and to the stem’s outer
cylinder.)
The new file size is 8.44K for the main file, 13K for the subpart. That’s more
than okay to me. The new files are here:
http://lummoxjr.byond.com/lego/6898.dat
http://lummoxjr.byond.com/lego/6898s1_8.dat
Now then, some follow-up questions: 1) Is my subpart file name kosher? I much
prefer this to s/6898s00.dat. After looking I couldn’t find much of a clear
answer on whether there’s a standard for this beyond following the part number
with s. 2) How would one go about submitting a part with subparts to the
tracker? I didn’t submit 6251.dat myself, so the tracker submission process is
unknown to me. (For that matter, I have a minor update to 6251.dat to share.)
I’d like my next project to be x79.dat,
which raises some intriguing questions. This part has curves etched into the
sides to simulate bunched fabric. If I went ahead and modeled it without looking
into a better approach, I’d be overlooking a wonderful opportunity. The problem
of producing an etched curve on a surface is just another form of the problem of
producing raised lines on such a surface--the technique that would be needed to
produce hair pieces. Whoever comes up with a tool that can gracefully produce a
surface with etched/raised splines according to user specifications will have
opened the door for good part authors to “easily” create textured minifig hair.
The main questions to my mind are how best to implement such a tool, and what
information it would require to do a good job. Clearly this will require a lot
more thinking out loud.
Lummox JR
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Message has 1 Reply:
 | | Re: Part building advice - too many triangles/quads?
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| (...) Great work. The subpart naming standard(s)n are documented at (URL) So, I'd rather your subpart were named s6898s01.dat. Submitting a new part to the Parts Tracker is easy. You need to register as an LDraw.org user (at (URL)) and then request (...) (20 years ago, 26-Nov-04, to lugnet.cad.dat.parts, FTX)
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Message is in Reply To:
| | Re: Part building advice - too many triangles/quads?
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| (...) I think the filesize:quality ratio is good. I notice that almost everything is coded to 4 decimal places. Except when (and maybe not even then) a surface joins to a circular primitive, 3 DPs should be sufficient in parts (0.0001 LDu < 0.00002 (...) (20 years ago, 25-Nov-04, to lugnet.cad.dat.parts, FTX)
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