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 From:  Tony77
5233.1 
Hello
How to build a wall that follows the pattern of scales as indicated by the red line?

The wall has to follow the development of scales
thanks in advance
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 From:  Frenchy Pilou (PILOU)
5233.2 In reply to 5233.1 
I am not sure of what do you do want! :)
This ? The block killed ? ...
For this I have "projected" to the closest point the red curve to the wall surface on the other side,
Copy move the wall part
draw some lines between the new curve and existing volume, make a volume with some sweeps and make a boolean Diff

EDITED: 3 Jul 2012 by PILOU

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 From:  bemfarmer
5233.3 
For circular stairs, the slope is the rise divided by the run.
The narrow side of the stairs is steeper.
Transitioning to a straight section my involve a 3rd slope.
Then there are building codes...

Red line can be offset the width of the wall... extrude...

The red line is a helix.

For a castle, the defenders above were usually right handed(?)
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 From:  Frenchy Pilou (PILOU)
5233.4 In reply to 5233.3 
<< For a castle, the defenders above were usually right handed(?)
but very useful for fire men!
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Pilou
Is beautiful that please without concept!
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 From:  bemfarmer
5233.5 In reply to 5233.4 
:-)

Offset, 2 lines, extrude. Copy, rotate...

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 From:  Tony77
5233.6 In reply to 5233.5 
Thanks to all
I tried fix it
do you okay?
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 From:  Frenchy Pilou (PILOU)
5233.7 In reply to 5233.6 
Perfect!
I was not to fare away :)
Now maybe Michael gives you the best method for that :)
There is always many way for make the same!
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Pilou
Is beautiful that please without concept!
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 From:  Michael Gibson
5233.8 In reply to 5233.6 
Hi Tony77, it looks like you have what you need?

One other method for building a surface that follow a helix curve is to use Sweep, setting the twist option to "Twist = flat", so for example with this red helix curve sweeping the line with "Twist = flat" will generate this kind of ramp type surface:



- Michael

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 From:  Tony77
5233.9 In reply to 5233.8 
I have to create a wall of protection for the scale
Must have the same path of the scale but higher
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 From:  Michael Gibson
5233.10 In reply to 5233.9 
Hi Tony, sorry I don't really understand what that means. Could you possibly make a more detailed description or maybe a sketch of what you're trying to do?

- Michael
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 From:  Tony77
5233.11 In reply to 5233.10 
The design is what I posted
I just wanted to know if there is a more accurate and faster
but I think I already answered with what I posted
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 From:  Michael Gibson
5233.12 In reply to 5233.11 
Hi Tony,

> I just wanted to know if there is a more accurate and faster
> but I think I already answered with what I posted

More accurate and faster than what though? Which method did you use to generate that Scale1.3dm file?

Something like get 2 helix curves for the top and 2 planar arc curves for the bottom and then loft between things? That should be a good method.

- Michael
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 From:  Tony77
5233.13 In reply to 5233.12 
I made a half turn helix and then a section of a planar curve and sweep

as in the file scale1.3dm

Post the new file

Sorry for my english :)
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 From:  Michael Gibson
5233.14 In reply to 5233.13 
Hi Tony, your method there is probably the fastest. There is a slight accuracy loss with it because with 2 rail sweep the profile slides along the rails and since each rail is of different length the "in between" sections will wobbly just very slightly instead of staying absolutely vertically aligned. However it will be a very minor amount of wobble and it will be aligned exactly at the start and the end so it's probably fine.

The method with the absolute most accuracy would probably be something like - take a bottom planar outline like this:



And extrude that up to make the base form:



That base surface is now extremely accurate since it is an extrusion of 2D arcs, so those walls have the 100% precise shape of a cylinder with no variation at all.

Then to form the sloped top construct a sweep like I showed earlier, with this as the profile for the sweep:



And just this one helix for the sweep rail, making this 1-rail sweep ramp surface:



Boolean difference the "whole wall" with the ramp surface:



Delete the portion you don't want.



Generally this method of constructing a more simple larger primitive and then slicing it gives the highest accuracy because you know most of the shape comes from the exact primitive shape.


The error in your 2-rail sweep method is quite small though, so it's not like it's a bad method, it's just that 2 rail sweep is not going to guarantee that all the in-between sections are all co-planar with one another as the profiles are sliding along different length rails.

- Michael

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 From:  Michael Gibson
5233.15 In reply to 5233.13 
Also another factor making a very slight inaccuracy in your 2-rail sweep method is that end tangents of a helix are not pointing in the same flat direction as the arc - a helix has a slight incline to its tangent direction and during the 2 rail sweep the profiles will follow a kind of average tangent between the 2 rails and so that will basically angle the profiles a little bit as the sweep traverses its path.

Basically if you want to have the most accuracy if you want a shape that is supposed to be a fragment of a cylinder it will be the most accurate to actually construct it literally that way by starting with a cylinder and then cutting it.

- Michael
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 From:  Frenchy Pilou (PILOU)
5233.16 
Project an inclined line to the "cylindre" is not more simple than draw the first helix ?
Or maybe the projection of a line is not the same drawing than the helix!

Effectively there is not the same! :)

EDITED: 3 Jul 2012 by PILOU

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 From:  bemfarmer
5233.17 
"scale" (climb up) definition: to climb up by means of a ladder.
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 From:  Michael Gibson
5233.18 In reply to 5233.16 
Hi Pilou - no a projection of a line onto a cylinder is a different shape than a helix.

- Michael
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 From:  Tony77
5233.19 In reply to 5233.18 
Ok thanks for the help michael
:)
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 From:  Frenchy Pilou (PILOU)
5233.20 
Another solution :)
Draw internal Helix
draw external Helix
Loft straight
Boolean diff
:)
---
Pilou
Is beautiful that please without concept!
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