An exercise: DRAWING A PARISIAN FENCE
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@taffgoch said:
Simon,
Consider how the manufacturer produced the fence. Q: With what did they start?
A: A length of "wire," with a constant, repeated sine wave. This should be maintained in a 3D model. Keep all of the sinusoidal segments the same length.
Truly, the sine segments along the top of the fence will be curved, but they should be maintained at the same length. I can demonstrate this evening, when I have some modeling time.
-Taff
So true..i just quit because of that
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When i thought i have figured it out
,disaster(see how the wires intersect in the left down corner and ..of course ,they are not woven)
More trials to go
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@unknownuser said:
Remain to draw these curved and angled sinusoids..
When you have flat model
Curved can be made by the Fredo Scale, no?
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hmm..just..wow..clearly u know some maths .
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Wahoo! "bravo" Taff
_ and I feel the result beautiful Now I know it can be done, I want to find the way: with your indications but without open your skp yet.
and I'm actually in front of the picture expecting something stand up from my perplexity
I shall come back
*simon
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@simon le bon said:
...and I'm actually in front of the picture expecting something stand up from my perplexity
Simon,
As I wrote earlier, I had a couple of false starts, until I studied the picture more closely...
Each unit/increment is half of a sine wave (crest-to-trough, or trough-to-crest.) I finally recognized that each diamond was 6-units wide, having 5-unit side lengths. Only then would model components fit together properly.-Taff
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@simon le bon said:
I know it's not the subject of this thread, but that image would make a great map with an opacity mask on it
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True, I was also thinking about it. You can easily make it tilable horizontally, too - the only problem is that vertically it should be a bit higher so that you could apply it on more various (although of course, still limited) height.
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Dear Taff,
I go slow, step by step. It is so cool to get you as professor
1)how to make a sine-wave.
2)anatomy of the braided fence
Re I see 6 but not 5 1/2 sine-waves:?:
OK we'll see later!
3)some testing just to see!
..to be continued
simon -
@ely862me said:
Mr Simon,watch it, because they are now weaving.
Ely, I don't understand what that means..Well: there is a problem with my previous test.
If I use 6 by 6 half waves as shown, the wiring doesn't braid!!!
let me see...
*s -
Mr Simon,watch it, because they are now weaving.
Edited:Mr Simon,watch it, because they are NOT weaving(braiding). (sorry
not so usual words for me ) -
I meant it s not braiding.
U must follow the indication from Taff : 5 by 6(diagonal)
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Taff, you are right!
And Ely too (you are quicker than me
)
The diamond need to be done with an odd number of semi waves.If I take the same wave and use 5 semi waves:
that works perfectly.
if I analyze better the fence -( I take a pen an a shit of paper and draw the wave blindely, just looking to the picture, i discover you are right: 5x5 semi waves!)A good point
going to next step..
simon -
@unknownuser said:
shit of paper
Otherwise an excellent study to compliment Taff's Geodesic Challenge.
Look forward to the 'Loop' mathematics
Rich
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The beginning was ''almost'' easy..the next step..i dare to say, it ll be the last
,but good luck anyway! -
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OOPs!!!
OF
sheet!!!
@unknownuser said:
The beginning was ''almost'' easy..the next step..i dare to say, it ll be the last ,but good luck anyway!
I can smell it is the point! Afraid to engage the step
s
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@simon le bon said:
The diamond need to be done with an odd number of semi waves.
If I take the same wave and use 5 semi waves:
that works perfectly.Recall that I, also, had a couple of "false starts." You have just re-solved my first false start.
My second mistake involved the horizontal "rail" strips that run at the top and bottom of the fence. That spacing also has to be precise, or they won't braid, either.
(And you can't cheat, by using a different sinusoidal spacing. The fence is supposed to be made of all the same sine-wave wire.)
-Taff
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@unknownuser said:
When you have flat model, curved can be made by the Fredo Scale, no?
That should work fine, for "bending" the top hoops, and the short segments just below the top rails.
(Pilou, when I first read your post, I wasn't quite sure what you were talking about. Looking back, your idea makes sense, even though I haven't tried it.)
-Taff
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And now the coup de grace
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