Manage the creation of lines between points

Hi everyone,

Iam a beginner with grasshopper and i'm having some problems with the line tool.

I'm trying to recreate this project of Lift architects - http://www.liftarchitects.com/#/pickle-pavilion/ - by following their instructions. Everything seems fine until Step three : i'm trying to conect the new points with the upper grid points and i'm getting a lot a conections going in every directions. I tried with shorter list but it wasn't better ...

If some of you could help me i'll be really gratefull.

please find attached the grasshopper and rhino 5 files

Attachments:

mesh.3dm, 84 KB
grids.gh, 10 KB

Replies to This Discussion

Permalink Reply by Joseph Oster on July 19, 2015 at 7:52pm

Re-posting - I got confused (twice) because your reference surface is upside down from what is shown at LIFT...? I finally flipped it in Rhino, aligned it with the origin, and internalized it in the GH file.

I used just one grid instead of two, above the surface at "ceiling level", moving (copying) all the grid points down in the Z direction, below the surface.
I flattened both inputs to the last 'Line' component.

When you see a nest like that, you need to look at the data feeding the component - the tree structure of both line inputs must match. It's not as simple as "always flatten" either... One needs to examine the tree outputs at every step of the way.

Attachments:

grids_2015Jul19a.gh, 18 KB

Permalink Reply by Joseph Oster on July 19, 2015 at 8:41pm

A day of distractions... I was too hasty in flattening. The result LOOKS and is the same, but if you ever wanted to really build a thing like this, you will need the length of each line in rows and columns, not as a flat list!

Attachments:

grids_2015Jul19b.gh, 20 KB

Permalink Reply by Joseph Oster on July 19, 2015 at 10:01pm

So much can be learned by refining code...

I added back the original X, Y offsets for the grid origin, then found it necessary to filter diagonal lines - the grid points off the edge who's X or Y value is different from its matching intersect point are 'Dispatch'ed to 'B' (ignored) and only the 'A' list is used for lines between 'RecGrid' and 'SCX'.

Attachments:

grids_2015Jul19c.gh, 29 KB

Permalink Reply by Erle Marec on July 20, 2015 at 4:42am

Hi !

Thanks a lot for your help, In fact i'm not trying to make the exact same thing than they did i'm using as a starting point for an experience... that's why the reference surface was upside down (sorry for messing with your head :) ...).

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