Reciprocal Structure with cutouts and ellipse Joint

Hi !

I am working on an assignment on wooden joint structures and am currently struggeling with the last steps - maybe someone can help :’)
I have the main geoemtry looking like this:

in which is a reciprocal structure defined by rotating the individual lines:

With the graphs in the middle I already tries to fix the issue, that a reciprocal structure does not necessarily work perfectly on this kind of geometry.. but so far it kind of works. Just for understanding the whole process some screenshots:

Then there is also the definition for the ellipse pocket joints that are supposed to be located at the solid intersection area of where the two slabs meet .
Here you can see an example of the intersection areas:

in the beginning I already definied the ellipse joint connection, it looks like this:

In the end it looked like this, a parametric joint, with two parts:

This is what i also want to hace at the intersections of my geaomtry. I already managed to at least get an ellipse to the area of the intersection , which you can see in the lower part of the definition.

whats missing now, is the separation of the slabs in pairs, meaning Type A: pocket joint with extruded ellipse and Type B: Pocket joint with en ellipse hole. As of right now the slabs all come as one pack, and are not sorted. Another problem is, that at each intersection there are two ellipses, probably because of the two slabs intersecting. But this comes as a secondary problem.

I hope I could explain it well enough, maybe someone has an idea for me. I am a beginner at doing this and AI could not help me either - grateful for any tips !
Thanks in advance

Dear Julia,

Please help us, so we can help you:

  • Cut your issues up in single questions, to avoid it becomes a heap of information without a clear point “where to start”.
  • If it is hard to clearify all questions, just pick one as a starter. And try to isolate all information to that issue. Isolate this by internalising the material what is needed to show the issue, and leave everything else out. Make it as small you are able to,
  • And provide the .gh file you made. So we can see how you did it. Do not assume this can be done only by looking at the images. “Because of all the trees, the forest can not be seen anymore”
    PS: I do not ask this only for us, forum people, but also because I know (own experience) that pulling a quest apart and trying to explain to someone else is a great way to learn,

Regards, Eef

Dear Eef,
thank your for you feedback. I’ll try to be more exact with my question.
First the grasshopper file:

260314_Reziprok_Julia_Letzte Datei.gh (51.4 KB)

my main problem is, that I have rods that are all in one geometry ( “extrude - geometry” in this pic).

They meet in a reciprocal structure. and where they overlap there will be a wooden ellipse joint. For that I need them separated in two groups - the upper rods and the lower rods, so that I can define which rod has a cutout and the other that has the ellipse joint to fit the cutout.

How do I sort the rods from my Extrude-param to get there ?

Thank you!
kind regards,
Julia

You will have more than two groups. Your rods meet in hexagons and pentagons, so it is impossible to have the rods be purely upper and lower.

I trust you are familiar with this thread? :slight_smile:

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Ideally all your members are the same in a recriprocal structure. I see the lengths of your drive geometry vary by quite a bit.

I see you have some gaps between drive elements, and your overlaps vary. This will make this difficult to solve, and not very practical to build if that was ever the goal.