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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Sat, 22 Mar 2003 19:48:57 GMT
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Viewed:
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4487 times
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In lugnet.cad.dat.parts, John Riley writes:
> 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.
>
> Under the current naming scheme, this primitive would be named:
> t04o10000.dat
> which is not in 8.3 format.
You might be surprised at how close t04o9999.dat would come. I can't see
that it's any worse than the current t04o3333.dat file. Actually, I think
I'm going to modify LDView to recognize nnnn in the minor fraction (where n
is 0-9) to be exactly equal to n / 9. In all likelihood, anyone using nnnn
really means n / 9 anyway. That would produce exactly 1 for the 9999 case.
If we modify the spec to say this, you can have your unit torus without a
new naming convention. Programs that perform primitive substitution can
have an exact match, and the data in the file itself can be exact.
> 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).
>
> 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. 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)
I can't imagine an inverse-ratio inner torus ever being used. It would
overlap itself. So the o is redundant.
> thus, for a maj=1 min=1, 1/4 outer torus (the one I made)
> i04o1000.dat
I don't think this is a good idea. You're sacrificing one of the precious
8.3 digits as an indicator that this is a unit inverse torus. 0 and 1 are
the only valid choices, and if it's 1, all three of the other digits have to
be 0 (otherwise it should just use the current naming convention). While I
realize you're trying to come up with something that solves your current
problem, I don't think this is a good solution.
> for a maj=1, min =2, 1/4 outer
> i04o0500.dat
> and so on.
As per my above comment, this would be i04o5000.dat (which of course doesn't
solve your immediate problem).
> 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?
That would work, but I think that t04o9999.dat might be a better solution.
Remember, .9<repeating> is mathematically exactly equal to one. Obviously
.9999 isn't exactly equal to one, but since t04o3333.dat is supposed to mean
.3<repeating>, I don't think it's such a stretch to say that 9999 means
.9<repeating>.
--Travis Cobbs (tcobbs@REMOVE.halibut.com)
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Message has 1 Reply:
 | | Re: New Primitive Class
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| (...) I'm not terribly surprised. This is a great solution, as then, if for some reason in the future, inverse ratio tori are needed, they can use the same convention, just a different starting letter and inverting the ratio as appropriate in the (...) (24 years ago, 22-Mar-03, to lugnet.cad.dat.parts)
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Message is in Reply To:
| | New Primitive Class
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| 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 (...) (24 years ago, 22-Mar-03, to lugnet.cad.dat.parts)
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