help with islamic pattern

Hello everyone, I am very new to grasshopper and i am learning how to deal with it while making an assignement. so my target is on the picture 1. I created it with the evaluate curve command and I am controling it thourgh a slider to attract to points to the center and change the shape . What I want to do is to copy it with different values on the slider to have a changing pattern. I did make a copy and I am stuck how change to value for each pattern. Maybe I need an equation or something I couldn't figure it out. I would appreciate any help.

Thanks all

Attachments:

24fc6fb5ed05573c1d7c7fe85b4e8acd (1).jpg, 558 KB
a.JPG, 193 KB
b.JPG, 112 KB

Replies to This Discussion

Permalink Reply by sarra hadji on June 2, 2017 at 10:59am

this is my grasshopper file

Attachments:

fffffffinal1.gh, 24 KB

Permalink Reply by Joseph Oster on June 2, 2017 at 11:40am

Did you happen to notice this thread earlier today? Very similar pattern:

http://www.grasshopper3d.com/forum/topics/question-pattern-extrude

One of the keys to that code is this part, where the center point of each polygon is pulled to a curve; the pulled point becomes "Center of scaling" ('C' input to 'Scale') for that polygon. And some re-mapping of the scaling factor is used, based on the distance the point was pulled.

Permalink Reply by sarra hadji on June 2, 2017 at 11:49am

hi Joseph;

thanks for the reply. yes i have noticed that the pattern is similar, but the outcome is different? I dont want to modify the extrusion level but the shape of the pattern controlling the anchor point of the star . like in the image below i would like to get this result https://vimeo.com/43345795 ( see the shape in the video)

Attachments:

Capturesf.JPG, 30 KB

Permalink Reply by Joseph Oster on June 2, 2017 at 12:10pm

Forget about the extrusions, that all came after the pattern was created. Sorry, I'm not going to watch a video. The general idea is a common one; using distance from one or more "attractors" (usually curves or points) to modify various factors that affect the shape of each polygon. Many examples on this forum, the code posted in that thread is just one way.

Permalink Reply by sarra hadji on June 2, 2017 at 12:58pm

Okay I understand, thank you very much i will check that :)

Permalink Reply by Laurent DELRIEU on June 2, 2017 at 1:06pm

Here an example of attractor, if you want to learn the best is to try to recreate it with just the images. I simplify a lot the generation of pattern. I took a polygon with odd number of vertices. The I move odd and even points with a different ratio => 2 graph mapper.

Permalink Reply by sarra hadji on June 2, 2017 at 2:55pm

Thanl you very much Laurent, that's an amazing help from you. I have followed your steps but somehow, i get a very different result. Would you please check my file and help me with what's wrong. also there is an error in my polyline that i couldn't solve.

Attachments:

solution.gh, 17 KB

Permalink Reply by Laurent DELRIEU on June 2, 2017 at 3:05pm

Like Joseph said tree, graft ... so structureation of data are very important. You forgot some graft ... For example on xyz component you need a graft in Y. A graft will make a sort of "for" For each leave in Y of the tree (Y) combine with all the list in Y.

Here is my script, but the best for you is to follow he flow and to look at the little arrows on components. It will help you a lot.

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