Subject:
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Re: Regarding the "hoser" program
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 4 Jun 1999 23:33:53 GMT
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Viewed:
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586 times
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In lugnet.cad, Fredrik Glöckner writes:
> I'm aware that there exists a spreadsheet which can be used for making
> curved hoses at
>
> http://www.geocities.com/Heartland/Fields/1864/hoses.html
>
> Now, I haven't got any software to use such spreadsheets (assuming it's
> Excel?), nor have I even used a spreadsheet before. (I haven't used
> Word either, some find that even harder to believe.) I couldn't find
> any README.TXT file in the hoser.zip archive either.
D'oh, I still haven't fixed that error, have I.
> Anyway, I wonder if someone can very briefly explain to me what kind of
> technology is used. Do you use splines or bezier curves, or something
> completely different?
It's based on a spline curve.
> Do you specify the direction at the endpoints and
> total length of the hose?
You specify endpoints and "control points" which determine the curves shape.
> Is the hose layout determined by minimizing
> the maximum curvature given some constraints, or by some other
> technique?
I'm sure there are others who could explain spline curves better than me.
Using the control points (which really work like vectors) you can pull the
curve in any direction. Well, almost any direction. I've been meaning to try
a hose in a loop configuration, or even a double loop.
Unfortunately with the spline curve formula I found to use, points along the
curve are given at even intervals of "t", not even distances along the curve.
So I added some "normalizing" formulas to approximate equidistant points, then
had to rotate each section of the hose so it points toward the next.
I would love it if some handy programmer would care to write a proggy which
would accomplish the same task without the cumbersome use of a spreadsheet.
-John Van
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Message has 1 Reply:
 | | Re: Regarding the "hoser" program
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| (...) Thinking back at my "Calculus" days, I seem to remember that it should be possible to generate a curve by specifying the end points and their start angles, as well as the length of the curve by minimizing the curvature. Of course, one would (...) (25 years ago, 5-Jun-99, to lugnet.cad)
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Message is in Reply To:
| | Regarding the "hoser" program
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| I'm aware that there exists a spreadsheet which can be used for making curved hoses at (URL) I haven't got any software to use such spreadsheets (assuming it's Excel?), nor have I even used a spreadsheet before. (I haven't used Word either, some (...) (25 years ago, 1-Jun-99, to lugnet.cad)
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