Arch Dam with GH & Python

Hello everyone, First I thank for its magnificent gulio component GH Python.
In addition, this post comes from this discussion:

So thank you also a systemic.
And for his help, Charles De Ville d'Avray!

Here is my project:
An arch dam from a spiral of equations with polynomials of the second and third degrees.

The definition is broken down into five steps:
1.Definition the axis of the dam
2.Definition the cut in the key
3.Definitions thickness of the peak
4.Extraction parameters for facing upstream and downstream
5.Modélisation with native components of GH.

1.Mean Fiber

GH definition

Rhino

2.Crown cantilever

GH Definition

Rhino

3.Widening (Crest)

GH Definition

Rhino

4.Final Downstream face & upstream face

GH Definition

Rhino

Modeling with compoment GH:

Result 3D Solid

Replies to This Discussion

Permalink Reply by Giulio Piacentino on October 13, 2011 at 12:55pm

Very nice! It would help to hear if you, after this project, have wishes or maybe encountered bottlenecks? Also, in final_GH there are also some other vb components. Do you need any help to convert them?

Again, cool project.

- Giulio
_______________
giulio@mcneel.com
McNeel Europe

Permalink Reply by Rémy Maurcot on October 14, 2011 at 2:39am

Giulio thank you for your answer. I have not encountered any problems in using GH python,
In fact everything is in reading the file out of python, the format does not match that of a grasshopper.
He forged a meter component in place to get to read the data.
GH Python lists me spring 3 xy and z format [x1, x2, x3,...] [y1, y2, y3,...] and [z1, z2, z3,...]

The VB code is simple: (A = CDbl (x))

Permalink Reply by Giulio Piacentino on October 14, 2011 at 1:49pm

I am not sure I understand every aspect of this, but maybe the Python float function will help.

- Giulio
_______________
giulio@mcneel.com
McNeel Europe

Attachments:

convert-python-double-float.gh, 1 KB

Permalink Reply by Rémy Maurcot on October 15, 2011 at 4:40am

Thanks giulio, but the code for float function it's ok.

Just to say that the format of points from GH_Python is not compatible with GH, the format is a bit special.

GH Python lists points xy and z format [x1, x2, x3,...] [y1, y2, y3,...] and [z1, z2, z3,...]

not [x1,y1,z1]...

See you soon

Permalink Reply by Giulio Piacentino on October 15, 2011 at 11:34am

It seems that you are already quite familiar with the topic, yet this is one convention that is useful to control properly:

[x, y, z] is a Python list
(x, y, z) is a Python tuple

You can use both of these to mean RhinoScriptSyntax points, and Rhino.Python will pretend that they are "normal" points. Yet they are still lists or tuples. Grasshopper has no knowledge of them, and cannot understand whether for example this is just a list of three numbers, a 3d vector or a 3d point. So if you want to obtain a point in a with RhinoScriptSyntax, do so:

import rhinoscriptsyntax as rs
a = rs.AddPoint(1, 2, 3)

---

or in RhinoCommon:

from Rhino.Geometry import *
a = Point3d(1, 2, 3)

These two methods yield the same result. a will be a Guid in the first example and a Rhino.Geometry.Point3d in the second. If you have "Automatically marshal Guids" in the first example, the output will not be the random Guid, but the point itself.

I hope this is useful,

- Giulio
_______________
giulio@mcneel.com
McNeel Europe

Permalink Reply by Rémy Maurcot on October 15, 2011 at 5:39am

Giulio,

I have no outcome on the small python code.

Permalink Reply by Giulio Piacentino on October 15, 2011 at 11:38am

It seems to be working here.

Last week's Rhino 5 had a bug. It needs to have EditPythonScript running before using the Python component in Grasshopper. I think this is fixed in the 2011 October 12 version.

Thanks,

- Giulio
_______________
giulio@mcneel.com
McNeel Europe

Permalink Reply by Rémy Maurcot on October 16, 2011 at 11:16am

Sorry it's not problem.

When I write list of points, the format is special;

[x1;x2;x3;...] [y1:y2:y3;...] et [z1;z2;z3;...]

It's not normaly, but list of point [x1,y1,z1;x2,y2,z2;...]

Do you understand why?

Permalink Reply by Giulio Piacentino on October 16, 2011 at 1:46pm

Here some methods to work with points.
Please feel free to post any further question!

Cheers,

- Giulio
_______________
giulio@mcneel.com
McNeel Europe

Attachments:

python_some_methods_for_points.gh, 6 KB

Permalink Reply by Rémy Maurcot on October 16, 2011 at 2:20pm

thanks, verry thanks

Permalink Reply by LOSBOS on January 18, 2014 at 7:24am

Hi Remy,

It's a very nice job !

I just discover GS and the possibilities to create complex 3D model are infinite.

I try to do my first development by designed an archdam too.

I use the "Guide for preliminary design of Arch dams" by the US Bureau of Reclamation, but this kind of literature is very poor especially for the explanation of the design.

I understand that we use a part of a spiral definition, but I have no idea concerning the evolution of the section from the crest to the fundation.

What is your reference documents to do this job ?

Many thanks for your help.

Permalink Reply by Rémy Maurcot on January 20, 2014 at 3:57am

Losbos,

I can not communicate on the geometry of the structure, it is confidential !

I can help you understand the generation mechanism of the points of the structure:
Here to GH_Python component was used to create points using a recursive function.
For each level:
Depending on the axis (1.Mean Fiber), the key (2.Crown cantilever) and the thickness (3.Widening) calculating upstream or downstream face of the dam .

The mathematical function used takes into account a part of the logarithmic spiral.

Best,