Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: 2736 (Technic Axle Towball)
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Wed, 13 Sep 2000 15:06:12 GMT
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Viewed:
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1289 times
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In lugnet.cad.dat.parts, Travis Cobbs wrote:
> I'm not sure if this is the proper procedure, ...
Actually, if you want to submit the fix to the parts library, you need to
send it to partsref@home.com.
> ... but I noticed a problem in
> part 2736 (Technic Axle Towball) which appears to have been caused by the
> part being authored without rotating the viewpoint away from the standard
> one.
Doh! Thanks for pointing this out. And posting a correction.
> The cylinder which was supposed to join the ball to the base didn't
> actually reach the ball. Below is my fixed version, with comments at the
> changed parts.
Nice. I'd disagree with:
0 You cannot
0 draw an edge between a cylinder and a sphere which
0 have different radii.
From the standpoint of creating a set of lines which follow the exact
intersections of polygons which simulate the cylinder, with the polygons
which simulate the sphere, you are almost correct -- it can be done, but
it's a lot of work.
But looking at what we are modeling, it is definitely possible -- you are
modeling a sphere, a cylinder, and a circle. You know the sizes and
positions of the primitives. The fact that their approximations don't meet
cleanly could be considered a problem with the underlying system, rather
than a problem with the partfile.
One other modification is needed in the file: a standard file-header is
required.
I would modify the file as follows. Notice that the edge-line still
doesn't quite reach the sphere-polygons, at very high resolution. But it
would lay on the cylinder-sphere intersection, in a rendering program that
kept edges and did p-file substitution:
0 Technic Axle Towball
0 Name: 2736.dat
0 Author: James Jessiman
0 Original LDraw Part
0 2000-09-13 TC Fixed gap between cylinder and sphere.
0 2000-09-14 SEB Added standard header and adjusted fixes.
1 16 0 0 0 0 18 0 1 0 0 0 0 1 axle.dat
1 16 0 0 0 0 0 0 8 0 0 0 0 8 4-4edge.dat
1 16 -2 0 0 0 0 0 8 0 0 0 0 8 4-4edge.dat
1 16 -2 0 0 0 0 0 4 0 0 0 0 4 4-4edge.dat
0 1 16 -6 0 0 0 0 0 4 0 0 0 0 4 4-4edge.dat
0 Previous line removed by Travis Cobbs
0 And re-added/adjusted by Steve Bliss:
1 16 -7.0718 0 0 0 0 0 4 0 0 0 0 4 4-4edge.dat
1 16 0 0 0 0 0 0 8 0 0 0 0 8 4-4disc.dat
1 16 -2 0 0 0 0 0 8 0 0 0 0 8 4-4disc.dat
1 16 -2 0 0 0 2 0 8 0 0 0 0 8 4-4cyli.dat
0 1 16 -6 0 0 0 4 0 4 0 0 0 0 4 4-4cyli.dat
0 Previous line fixed by Travis Cobbs to be:
0 1 16 -8 0 0 0 6 0 4 0 0 0 0 4 4-4cyli.dat
0 And then modified by Steve Bliss, to not intrude
0 into the sphere quite as far:
1 16 -2 0 0 0 -5.5 0 4 0 0 0 0 4 4-4cyli.dat
1 16 -14 0 0 8 0 0 0 8 0 0 0 8 8-8sphe.dat
0
--
Steve
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Message is in Reply To:
 | | 2736 (Technic Axle Towball) [DAT]
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| I'm not sure if this is the proper procedure, but I noticed a problem in part 2736 (Technic Axle Towball) which appears to have been caused by the part being authored without rotating the viewpoint away from the standard one. The cylinder which was (...) (24 years ago, 13-Sep-00, to lugnet.cad.dat.parts)
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