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Subject:
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Re: Torus primitive discussion. was( Updated Primitive - 1-8t0102 1/8 torus)
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lugnet.cad.dat.parts.primitives
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Date:
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Thu, 25 Jan 2001 03:04:35 GMT
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3593 times
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Sorry about taking so long to reply to this message. I have been working on
trying to make a few of these torii mentioned below.
In lugnet.cad.dat.parts.primitives, Steve Bliss writes:
> In lugnet.cad.dat.parts.primitives, Paul Easter wrote:
>
> > In lugnet.cad.dat.parts.primitives, Steve Bliss writes:
> >
> > Also, would there be any need for a part
> > that would be 1/2 of each of these files? Or do we address this later?
>
> 1/2 in terms of sweeping 45-degrees of the major circle? Or 1/2, in terms
> of a smaller sweep of the tube?
>
> Yes to the first, no to the second.
That is what I meant. :-)
> > I'm not sure what effect this would be, do we need to specify the torus'
> > tube(inner) radius if all the base part files will be 1 and scaled accordingly?
>
> That might be a good idea. It might mean we'd have to abandon the idea of
> putting the radius in the p-file name, because we could end up with weird
> radii.
>
> It would also mean we could potentially get a number of p-files which are
> hard to browse through, because they vary in size so much--think of trying
> to view two files, one with radius 5, the other with radius 50.
>
> Would it make more sense to hold the major radius to size 1, and vary the
> size of the tube radius? That would make all the different torii p-files
> appear more standard, and might make it easier to figure out which file to
> use for a specific application.
>
> Looking at the two options (holding the major radius constant or holding
> the tube radius constant), I don't think there's any difference in the
> procedure of selecting a p-file for a specific application. Holding the
> major radius constant "seems" easier to me.
>
> In either case, you'd have to figure out your specific major and tube
> radii, find the ratio of the two, and select the p-file that models that
> ratio.
>
> So I think the best way to identify these files is to put the ratio in the
> filename. The ratio of major radius to tube radius can never be more than
> 1.0, so we don't have to worry about encoding both fractional numbers and
> double-digit values. I think if we encoded first 4 decimal digits of the
> ratio, that should give us good results. But it might not be exact.
If we worked with the method used for the rings and similar existing
primitives, I believe the parts will be used more. I'm sure people can get
used to a different format with time.
I tried the method of holding the major radius to 1 and adjusting the tube
radius. At first I didn't like this method, but I think I can live with it.
A sample file is attached to this message. Please give it a look.
Paul
0 1/4 Torus Tube Inner Major Radius 1 Tube Radius 0.3333
0 Filename: 4ti3333.dat
0 Author: Paul Easter's Torus generator spreadsheet
0 Unofficial Primitive
0
0 Rounding set to 4 6 lines over 80 char. limit
0 L3P IFNOTPOV
0
1 16 0.9875 0 0.0633 -0.3208 0.0127 0 0 0 0.3333 -0.0638 -0.0639 0 1-4cyls.dat
1 16 0.9875 0 0.0633 -0.3208 -0.0509 0 0 0 0.3333 -0.0638 0.2561 0 1-4cyli.dat
1 16 0.9366 0 0.3194 -0.3208 -0.0127 0 0 0 0.3333 -0.0638 0.0639 0 1-4cyls.dat
1 16 0.8881 0 0.4364 -0.272 0.0362 0 0 0 0.3333 -0.1817 -0.0542 0 1-4cyls.dat
1 16 0.8881 0 0.4364 -0.272 -0.1451 0 0 0 0.3333 -0.1817 0.2171 0 1-4cyli.dat
1 16 0.7431 0 0.6535 -0.272 -0.0362 0 0 0 0.3333 -0.1817 0.0542 0 1-4cyls.dat
1 16 0.6535 0 0.7431 -0.1817 0.0542 0 0 0 0.3333 -0.272 -0.0362 0 1-4cyls.dat
1 16 0.6535 0 0.7431 -0.1817 -0.2171 0 0 0 0.3333 -0.272 0.1451 0 1-4cyli.dat
1 16 0.4364 0 0.8881 -0.1817 -0.0542 0 0 0 0.3333 -0.272 0.0362 0 1-4cyls.dat
1 16 0.3194 0 0.9366 -0.0638 0.0639 0 0 0 0.3333 -0.3208 -0.0127 0 1-4cyls.dat
1 16 0.3194 0 0.9366 -0.0638 -0.2561 0 0 0 0.3333 -0.3208 0.0509 0 1-4cyli.dat
1 16 0.0633 0 0.9875 -0.0638 -0.0639 0 0 0 0.3333 -0.3208 0.0127 0 1-4cyls.dat
0
0 Conditional Lines
0
5 24 1 0.3333 0 0.8724 0.308 0 1 0.3333 -0.3827 0.9239 0.3333 0.3827
5 24 0.9239 0.3333 0.3827 0.806 0.308 0.3339 1 0.3333 0 0.7071 0.3333 0.7071
5 24 0.7071 0.3333 0.7071 0.6169 0.308 0.6169 0.9239 0.3333 0.3827 0.3827 0.3333 0.9239
5 24 0.3827 0.3333 0.9239 0.3339 0.308 0.806 0.7071 0.3333 0.7071 0 0.3333 1
5 24 0 0.3333 1 0 0.308 0.8724 0.3827 0.3333 0.9239 -0.3827 0.3333 1
5 24 0.8724 0.308 0 0.7643 0.2357 0 0.8724 0.308 -0.3339 0.806 0.308 0.3339
5 24 0.806 0.308 0.3339 0.7061 0.2357 0.2925 0.8724 0.308 0 0.6169 0.308 0.6169
5 24 0.6169 0.308 0.6169 0.5404 0.2357 0.5404 0.806 0.308 0.3339 0.3339 0.308 0.806
5 24 0.3339 0.308 0.806 0.2925 0.2357 0.7061 0.6169 0.308 0.6169 0 0.308 0.8724
5 24 0 0.308 0.8724 0 0.2357 0.7643 0.3339 0.308 0.806 -0.3339 0.308 0.8724
5 24 0.7643 0.2357 0 0.692 0.1276 0 0.7643 0.2357 -0.2925 0.7061 0.2357 0.2925
5 24 0.7061 0.2357 0.2925 0.6394 0.1276 0.2648 0.7643 0.2357 0 0.5404 0.2357 0.5404
5 24 0.5404 0.2357 0.5404 0.4893 0.1276 0.4893 0.7061 0.2357 0.2925 0.2925 0.2357 0.7061
5 24 0.2925 0.2357 0.7061 0.2648 0.1276 0.6394 0.5404 0.2357 0.5404 0 0.2357 0.7643
5 24 0 0.2357 0.7643 0 0.1276 0.692 0.2925 0.2357 0.7061 -0.2925 0.2357 0.7643
5 24 0.692 0.1276 0 0.6667 0 0 0.692 0.1276 -0.2648 0.6394 0.1276 0.2648
5 24 0.6394 0.1276 0.2648 0.6159 0 0.2551 0.692 0.1276 0 0.4893 0.1276 0.4893
5 24 0.4893 0.1276 0.4893 0.4714 0 0.4714 0.6394 0.1276 0.2648 0.2648 0.1276 0.6394
5 24 0.2648 0.1276 0.6394 0.2551 0 0.6159 0.4893 0.1276 0.4893 0 0.1276 0.692
5 24 0 0.1276 0.692 0 0 0.6667 0.2648 0.1276 0.6394 -0.2648 0.1276 0.692
0
0 L3P ELSEPOV
0 torus{1,0.3333 clipped_by{ box{<0,0,0>,<2,0.3337,2>}
0 cylinder{<0,0,0>,<0,1.3333,0>,1}}}
0 L3P ENDPOV
0 End of File
0
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