Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: unofficial new primitive -- "Rounded Corner"
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 18 Sep 2000 23:31:13 GMT
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Viewed:
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893 times
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In lugnet.cad.dev, Franklin W. Cain wrote:
> It took me a while, but I finally realized why I'm so hesitant
> to re-orient this file... It's (part of) a sphere, and _all_
> of the sphere (and disc/non-disc/edge) files are oriented
> such that the "centerpoint" (i.e., focus) of the sphere/(etc.)
> is the _origin_ point of the file/construct (i.e., "0,0,0").
> In order to re-orient this new file,
> I would have to change the centerpoint to "1,1,1",
> and that's non-intuitive to my mathematical mind. :-(
Huh? The way you've got the file now, the sphere's centerpoint is at
<1,1,1>.
> Also, it's _already_ convex, I believe (it bulges outward,
> and that's "convex", IIRC, because the nmemonic [sp?]
> is "caves go in", so "con_cave_" could be "bulging _in_ward"...
> Have I got that right?...).
The current orientation of the file has the 'bulge' going toward the
origin, not away from it. So I'd say it's bulging inward.
> Here's the second image again:
> "http://www.brickshelf.com/gallery/fwcain/lcad/round-corner-2.gif"
> (Remember that I rotated the whole thing 90 degrees about the Y-axis
> just to make it easier for the image to be seen and understood.)
You've got that whole thing shifted, so the 1-8sphc.dat is oriented:
1 16 1 1 1 -1 0 0 0 0 -1 0 -1 0 1-8sphc.dat
Steve
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Message is in Reply To:
 | | Re: unofficial new primitive -- "Rounded Corner"
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| (...) It took me a while, but I finally realized why I'm so hesitant to re-orient this file... It's (part of) a sphere, and _all_ of the sphere (and disc/non-disc/edge) files are oriented such that the "centerpoint" (i.e., focus) of the (...) (24 years ago, 16-Sep-00, to lugnet.cad.dev)
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