Subject:
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Re: New Primitive Class
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Sun, 23 Mar 2003 02:07:37 GMT
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Viewed:
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920 times
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In lugnet.cad.dat.parts, John Riley writes:
> Actually, it's not a new primitive, but it doesn't fit under the current
> naming scheme.
>
> My current 33089 (in PT) is a rather bulky file (55KB), so to streamline it,
> I decided to make a few new primitives. One of these was a torus with major
> radius 1 and minor radius 1.
When Steve and I were working on the format for the torii, I believe we said
we would deal with this issue when it arose. Now it has.
> Under the current naming scheme, this primitive would be named:
> t04o10000.dat
> which is not in 8.3 format.
The spreadsheet I made to create p/16 and p/48 torii also included support
for this occurance. Basically, I changed the first letter to "r". The header
looked like this;
- 0 non-Torus Outside 1 x 1 x 0.25
- 0 Name: r04o0100.dat
This was not a discussed issue, so I took some liberties with it. I have not
settled on the "non-Torus" header, but it let me move on.
> I'm tempted to name this file t04ounit.dat. I'd make it a subpart, but it's
> a true primitive, and I can see it being used in the future (probably could
> be used in modelling helmets with flat tops, such as Boba Fett's and the
> Stormtrooper's).
yes, possibly.
> The other possibilty is to come up with a naming scheme for those tori with
> minor radii larger than their major radii. I'd call these inverted tori, as
> the minor/major ratio is inverted.
Inverted is a word that came to mind but didn't seem to apply.
> Thus, using a similar naming scheme,
> we'd have
> iFFXRRRR.dat
> where FF is the sweep as before
> X is o,i, or q as before
> and RRRR is the major/minor ratio (the inverse of the regular torus ratio)
>
> thus, for a maj=1 min=1, 1/4 outer torus (the one I made)
> i04o1000.dat
> for a maj=1, min =2, 1/4 outer
> i04o0500.dat
> and so on.
>
> Another possibilty is
> iFFXRRDD.dat
> where RR.DD is the minor axis length to 2 decimal place precision
> thus, the torus I made is now:
> i04o0100.dat
>
> or similarly
> iFFXRDDD
> now with 3 decimal place precision, but you now can't make tori with min/maj
> ratios >=10
>
> There are many more options, but these are the two I came up with that
> seemed reasonable. My personal preference is for the third (can easily
> distinguish btw 1/1.133 and 1/1.125) Any thoughts?
This is what my spreadsheet came up with:
- 0 non-Torus Outside 1 x 1.1333 x 0.25
- 0 Name: r04o0113.dat
- 0 non-Torus Outside 1 x 1.125 x 0.25
- 0 Name: r04o0112.dat
not much difference.
I have the following "non-Torus" files already generated. Let me know if you
want them to play with;
r04o0100.dat
r04o0200.dat
r04o0300.dat
Paul
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Message has 1 Reply:
 | | Re: New Primitive Class
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| (...) I checked some geometry websites, and the consensus is that these are tori. Just not the common type. (...) Inverse-ratio torus is a better name, but is fairly lengthy. An inverted torus, I think, is still a torus, just with the surfaces (...) (21 years ago, 23-Mar-03, to lugnet.cad.dat.parts)
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Message is in Reply To:
| | New Primitive Class
|
| Actually, it's not a new primitive, but it doesn't fit under the current naming scheme. My current 33089 (in PT) is a rather bulky file (55KB), so to streamline it, I decided to make a few new primitives. One of these was a torus with major radius 1 (...) (21 years ago, 22-Mar-03, to lugnet.cad.dat.parts)
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