Subject:
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Re: Advice on hair pieces
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Tue, 21 Sep 2010 15:26:25 GMT
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Viewed:
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22396 times
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> The quad adjustment for this piece showed that out of five quads out of
> alignment, it was able to fix four of them within the bounds of round-off error
> (that is, it didn't deviate the vertices from outside of what they could have
> been before stl2dat rounded them off). The fifth one it was not able to
> reconcile under any circumstances, so I made the tool split those cases along
> the edge where the angle between the two triangles would be smallest.
It would be interesting to have a configurable threshold, a 0.1ldu move is not
visible and might bring more quads to flat state.
> That's a relief. Anathema has made other quality headgear parts so if he's doing
> manual adjustments then I feel comfortable doing the same. Just as a heads-up by
> the way, your last comment there deleted your certify vote.
Thanks - fortunately it was certified by two other peoples ;o)
> On a related subject if this particular part goes well for me I'd like to do
> similar cleanup on 30475. When Mdublade submitted it he apparently only turned
> the hair into the correct orientation, but no primitive substitution was done on
> the interior and while the quads are all coplanar within 3°, they were obviously
> never cleaned up further to a tighter 1° spec. I didn't check out whether the
> interior is too small for the head, but I'd bet that's the case.
Probably...
> Since I have
> that part I'm positive I can fix the interior. I assume the usual etiquette
> there is to contact the person first where possible. I know that resubmitting
> just to improve coplanar tolerance when it's "good enough" is frowned upon, but
> it'd be worth cleaning up the other issues.
There is a special policy for LUT parts: "Once the part has been submitted to
the Parts Tracker, any reviewer finding errors may fix them immediately and
re-submit the fix without asking permission, since the original author is the
LEGO Universe Team." (see http://www.ldraw.org/Article490.html)
> I can't tell you how many times I've wished I had your scanner, but I have no
> head for mechanics. Some parts just haven't been released to us yet, like the
> still-mysterious x79.
The good point is that DAVID laser scanner (http://www.david-laserscanner.com/)
doesn't even require mechanics, and the free version is truly usable. I made my
first scan (Fabuland bear head) with it and a hand-held cheap line laser. That
said, it works better with some mechanical sweep (but a simple mechanical
kitchen timer is reported to work well!) and the paid version (better
resolution, easier assembly)
And BTW x79 is actually part 4505... It would be a good target for a laser scan
(but I don't have it!)
>
> I'm not sure there's a very ideal solution for joining scanned sections to
> primitives except for looking for a certain vertex tolerance and making
> adjustments where possible.
That was the general idea I had. Make vertices of the mesh snap either onto
closest vertices, edges or surfaces with different adjustable thresholds.
> In the case of part 44358, when I joined the
> interior to the cylindrical indentation in the middle, I actually added 4
> triangles because I needed to go from 12 points to 16. If not for the problem of
> 12-point circles I think some kind of limited primitive detection and automatic
> substitution would be feasible. As it is I think detecting places where a simple
> set of primitives could go is quite doable as long as there are hard lines
> around the points in question.
Yep... adapting 12 to 16 would not work with the above method. :(
Philo
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Message has 1 Reply:
 | | Re: Advice on hair pieces
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| (...) Ah, I was not. Very interesting. I'm still plowing ahead with upgrading Edger regardless because I'd like that built into this tool, but options like making inlining parts optional and not adding conditional lines within a certain angle (...) (15 years ago, 21-Sep-10, to lugnet.cad.dat.parts)
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Message is in Reply To:
| | Re: Advice on hair pieces
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| (...) Well, at least splitting into triangles at the middle would produce a fairly clean result in that it would eliminate artifacts, but at the cost of creating extra triangles. I've been working on my adjustment tool and my initial results have (...) (15 years ago, 21-Sep-10, to lugnet.cad.dat.parts)
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