An exercise: DRAWING A PARISIAN FENCE

pilou

It was the trick N°1, what will be the n°2

The curious thing is there is no precise documentation on the Net about this sort of garden materail

simon le bon

Hi Dear Pilou,

You always keep a vigilant and friendly eye

I guess you have noticed we all have followed your slices:

(The second trick after about a week to film "Rock'n Roll!!!!")

Dear Taff,
Here is my "final-final" parisian fence...

*s

TaffGoch

@simon le bon said:

I havn't discovered what was the mistake Taff was talking about

Simon, look here:
Fence mistake fixed
-Taff

TaffGoch

Simon,
I found that the key characteristic of the fence is the horizontal-to-vertical spacing. The diamond shape has to be exactly the correct proportions, or the sine waves of the top and bottom "rails" don't overlap properly. After a couple of false starts, I recognized my error, and got the diamonds the right shape.

I hope that I've provided enough detail, in the model, to demonstrate how I constructed the sine wave paths.

-Taff

This model contains a mistake. Download corrected model from 3D Warehouse.

simon le bon

Hi Taff,
I can't believe it I don't see the point

??simon

simon le bon

oops!
With the animation I can see it very well now, thanks

ely862me

Next challenge--->(not very hard, but let see..)endless spiral

Btw in the images are 3(for a better visual impact).

infinite spiral.jpg

infinite spiral a.jpg

infinite spiral c.jpg

simon le bon

Excellent Eli.
No idea of how we can accomplish this? (nice model!!!)
Shall try when I'll be back (i'm connected by phone )
*s

simon le bon

I have succeeded to make my video "Trick 2" before to leave.

The first big problem was to draw "The Diamond" with the 6x and the two 5x lines . I have discovered with Taff and JeanLemire that Su suffers of a lack of inference and consequency we need a:

@jean lemire said:

Method to allow to rotate an edge around one end in order to bring the other end in contact with an other edge. This is something that the inference engine cannot do.
see: Rotating an edge to another edge

I bring here my own method using TIG_TrueTangents v1.9

The second big point was to manage curves of an exact length between two pointsSee Taff's close by close Solution. This is another very sensitive point where SU is in default.

I have taken great advantage of Fredo's Bend Tool set in FredoScale 2.0i
YouTube SketchUp_ParisianFence_Tricks2(sorry I couldn't be shorter )
[flash=640,505:3ig0nr8b]http://www.youtube.com/v/nobO28fyV-g[/flash:3ig0nr8b]
& TIG_Mirror 31
What Else?

I havn't discovered what was the mistake Taff was talking about
@unknownuser said:

I just discovered a spacing mistake I made in the top-rail/hoop area!

++simon

simon le bon

Hi Ely,

I have succeeded without any spiral drawing tool , but I could not avoid from doing important sewing work into one of the steps. I'll show you some process in the evening. I'm very curious to learn an easier way that I'm sure you know.
It is a good exercise, thanks!

s

simon le bon

Here is my slow method

simon

simon le bon

Dear Pilou,

I don't know how you do to deliver always those sensitive links

@unknownuser said:

Seems make an half bowl with an helix in 2 parts (vertical internal & external )deformed by the Fredo Scale can make the trick
please if you have time, try it and show us, each solution is a benefit for everybody in this place.
*s

pilou

@unknownuser said:

those sensitive links

So you miss my final little try (crossing message, so I post there
Without Fredoscale, only Draw helix13 by Peter Brown, 4 parts as explain above, and rotate, Scale -1/ symetry
From the image above + Didier Bur line to cylinder
If it's not realy perfect spherical you can deform it
I have made a speedy test
(petit bricolage juste pour le fun

pilou

Seems make an half bowl with an helix in 2 parts (vertical internal & external )deformed by the Fredo Scale can make the trick
Then past a mirror one

Another solution is maybe use a geometric formula
Somewhere in this incredible world
Or here in french

Edit: seems that is possible with the plug Draw helix 13
Just take same start/end radius between each parts
and make some vertical symetry and rotation
With training I believe that you can make that in one minute!
spirale 13.jpg

TaffGoch

This attempt was a "proof of concept" model, to try out a technique I had in mind.

The same technique could be used to precisely match the frequency and repetition of the original posted images, with the right count of torus and circle segments. (I doubt I'll pursue that further, but thought others might be interested in the technique.)

Turn on viewing of "hidden geometry," to see how the follow-me path was drawn with the "Line" tool. (Model attached.)

-Taff

Torus_spiral.skp

Arc

Hi, guys, try the tours plugin (http://regularpolygon.blogspot.com/2010/07/plugin-torus-10.html)

pilou

@unknownuser said:

It seems to me that you may find an intermediate process to produce a really round shape, am I wrong?

I had not search to have a perfect round form
Maybe it's an hard way because you must play with the Helix parameters!
So maybe not the best trick for this problem
But as said previous you can deform it for approch the Sphere as your just previous post

pilou

@unknownuser said:

but this is the exercise!

Not for me! Form is secondary!
It was a trick for find the infinite closed path of the helix!

another trichky one : the Boy's surface By JPP

simon le bon

@Pilou

It seems to me that you may find an intermediate process to produce a really round shape, am I wrong?

@TaffGoch
It seems to me that we follow about the same method, and the sewing grows easily to a hard polycount

60x60=3600 ! I must be wrong somewhere

(picture coming from a study of TaffGoch model)

@Arc
Thank you to have discovered for us this Regular Polygon's plugin (Hello Regular ! )
The torus spiral can be easily rearranged with FredoScale