Arcs on Curves

Hi Guys,

First, I am totally new to parametric modelling and grasshopper. But I have to solve a Problem for my employer :)

We have this thing which is like the tama art library by toyo ito. So we have several curves which are intersecting and between two points, there is a arc, and also between the next two and so on.

Maybe someone can help me.

Thanks in advance

Mark

Replies to This Discussion

Permalink Reply by David Rutten on February 3, 2017 at 11:46am

Can you be a bit more specific? Perhaps upload the curves or a sketch of what you're after? When I google the building you mention, those curves don't seem to be circular arcs, they are some other kind of curve. But what curve do you need?

Permalink Reply by Mark Ullrich on February 3, 2017 at 12:25pm

thanks for replying. Well the building just frames the issue. It Doesnt have to be the exakt same curve. I think you would get closest with nurbs, maybe cubic?

https://divisare.com/projects/322210-toyo-ito-associates-rasmus-hjo...

at the bottom of the site, youll have some pictos of what i mean. the intersections of the splines on the floor are the start of the arc.

Permalink Reply by Laurent DELRIEU on February 3, 2017 at 12:42pm

Is it not catenary curves ? There is a component for that in Grasshopper in Curves Spline

Permalink Reply by Mark Ullrich on February 3, 2017 at 12:51pm

I dont think so, i tried catenary. Its not about the curve, its about the whole thing, Could also be squares as arcs.

Permalink Reply by Laurent DELRIEU on February 3, 2017 at 1:36pm

I saw this discussion

https://discourse.mcneel.com/t/super-elipse-please/40958/6

and tested rectangle with rounded at the maximum and it seems to be a very good approximation.

3 controls points on top, weight of 0.707 (sqrt2)/2, 1, 0.707.

Permalink Reply by Laurent DELRIEU on February 3, 2017 at 2:58pm

Hello it was a cool exercice. Here are some views.

Permalink Reply by Laurent DELRIEU on February 3, 2017 at 3:57pm

I did some errors when I tested TOYO ITO & ASSOCIATES TAMA ART UNIVERSITY LIBRARY

the errors are when I cut curved walls with a sort formwork. As walls are curved the thickness of formwork must be enough thick, but it could cut other walls.

Permalink Reply by Mark Ullrich on February 4, 2017 at 11:48am

WOW! impressive. I never could have nearly achived this. You guys are absolutely awesome!

Permalink Reply by Mark Ullrich on February 4, 2017 at 11:53am

would you mind to provide your grasshopper file? :)

Permalink Reply by Laurent DELRIEU on February 4, 2017 at 1:10pm

Yes it is a bottle of wine :-)

An try to begin work with Grasshopper, because I am sure you will have to change the definition. It is always not perfect the needs of others. To understand a definition follow the flow and use green tube icon "only preview selected geometry" you will understand the operations. I tried to show the differents part of the script.

Here is a version with 2 floors and size of library choose to play with cursors with "no walls" it is fastest. When you are happy put "walls".

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