Full Version: Spiral script 2D for setting out Corinthian capital scrolls

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This trial version adds a Z axis offset, for a 3D spiral, in 3D view.
-B

Attachments:
_IonicVoluteAlpha04.zip

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Thanks Brian!

Off topic, sorry.

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Ionic volute of Giuseppe Porta Salviati (1520-1575).
There is an excellent video here:
https://www.youtube.com/watch?v=HBh04ZtnLDM

The 3 "quarter circle" arcs in the upper left are actually slightly more than quarter circles.
Intersection with the eye is not quite tangent.

Attachments:
SalviatiVolute01.3dm

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Hi Brian

Will it be possible to make the script use an other folder than the original "command" folder?
I am currently using a subfolder to the command folder containing the scripts i use often, here i also put new scripts for test so they are easy to find :-)

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Hi hep - there are 2 different ways that scripts can be run, either as a "command" which has UI associated with it (like in this case), or as "immediate script".

For the command type those have to be located in MoI's command folder in order for MoI to run them.

- Michael

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Hi Michael
Thanks - i see.
that was a quick answer - I just love this program and it's forum :-)

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Hi Michael,

...what about the "scripts" folder instead ?

I see that also this folder is a suitable place for scripts, that haven't a UI associated, in order to be executed.

Thanks and nice day,

Marco.

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Some of the old Ionic Volute methods produced gaps between some of the quarter circles, which is often not mentioned.

In the 2005 book, The Classical Orders of Architecture, by Robert Chitham, the simple method of Chambers is given.
The Chambers method uses quarter circle arcs, without gaps. The results seem superior.

Surprisingly, it seems that a legitimate pdf of the book is available:
https://archive.org/details/The_Classical_Orders_of_Architecture_2nd_ed_R._Chitham_Arch._Press_2005_BBS

https://archive.org/download/The_Classical_Orders_of_Architecture_2nd_ed_R._Chitham_Arch._Press_2005_BBS/The_Classical_Orders_of_Architecture_2nd_ed_R._Chitham_Arch._Press_2005_BBS.pdf (free)

For the offset curve, called a "fillet," I used a sweep with pointy end, rather than finish laying out a second set of cyan points in the eye and drawing more arcs,
which are slightly different than the sweep.

- B

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Hi Marco,

re:
> ...what about the "scripts" folder instead ?
>
> I see that also this folder is a suitable place for scripts, that haven't a UI
> associated, in order to be executed.

You can place a script that is intended to be run as an "immediate script" (not run as a "command" that has UI and generates objects) into that folder yes.

But I think that Brian's script that is being referred to in this thread is one that has a companion .htm file for UI and so it is meant to be run as a command and not as "immediate script", and so like I wrote previously, you would need to put it in the commands folder, not the scripts folder.

For a script that can be run as "immediate script" (where it executes immediately and does not have any UI), there are a few options, you can make a "scripts" folder as a sibling to "commands" and put the script in there, and it's also possible to put it in any folder you want and then put in a full path to the script file (including .js file extension) in your keyboard shortcut. But you can't do this with commands though, MoI will only look for a command type script inside the commands folder.

- Michael

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Hi Michael,

Thanks a lot for your clarifications regarding the "immediate script" folders.

Nice night,

Marco.

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Hi Brian

Regarding your spiral script, is there any way to have a non linear control over the parameteres like growth and ofset - see attached image for an idea of what I am trying to achieve - the yellow line is a standard spiral using your script and the red line is one where I have manually adjusted the spiral outer arm. I am wondering if its possible to use your script slightly adjusted to get closer to a mathematical pure solution for this, giving a slower start and increasing openness

When you push the standard spiral growth and ofset the outer arm becomes very flat

Not being a maths expert, but I am wondering if it is possible to have a non linear growth from one spiral 360 degree revolve to the next ? where the growth starts small but increases in a non linear way ? This growth could perhaps be controlled by a curved line giving very subtle growth control (maybe elliptical 1/4 section) or a %

This could also be applied to the Z direction depth growth, to give a non linear and more natural feel. I have achieved this by projecting from a 2D spiral line down onto a domed revolved surface

Best wishes

Andy

Image Attachments:
Screen Shot 2016-04-28 at 07.56.35.png 

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Hi Andy,

I'll have a look later.
I had been studying a spiral using quarter arcs.
- Brian

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Hi Brian

Having written my last message it occured to me that I could probably work a solution using geometry - see attached .3dm file, which works really well

Take a spiral from your original script and extrude it down to a point, then revolve a curve (to give a lense fisheye effect) and then use curve - intersect for the result

Going back and adjusting the revolved 2D curve gives a real time visual intersection so you can visually adjust to suit your requirements :-)

Best wishes

Andy

Attachments:
Geometry solution spiral .3dm

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