Problem with LIST ITEM. PLEASE HELP

Hello.

I'm having much problems with LIST ITEM. I have a triangle surfaces (around 300 of them) penalized onto another surface. Now I am trying to make offset lines of those triangles and connect them to the triangles so I get tabs for later connection of triangles into a surface. Now when I use LIST ITEM to get three separate lines by setting Item Index to 0, 1 and 2 respectively I don't get separate lines so I can find endpoints and connect them to the triangle.
Here is a screen shot of grasshopper definition. I am using Plugin version 0.6.0059
Please help.

Attachments:

List Item.jpg, 253 KB

Replies to This Discussion

Permalink Reply by Emir Salkic on September 12, 2010 at 3:30am

Yes I have tried to flatten the lists. But if I flatten list I get just one result, just one curve. Here is a screen shot and the same in Rhino. Thanks for help.

Attachments:

Rhino.jpg, 280 KB
Grasshopper.jpg, 278 KB

Permalink Reply by Danny Boyes on September 12, 2010 at 1:22pm

You are facing a data structure that consists of many lists of 1 value so List Item will only beable to retrieve item 0 from each list and then error.

What you need to do is retrieve a specific tree branch based on the list of data paths. see example below.
Use the Param Viewer Component ro make a list of Data Paths and then select the intended paths with the List Item and this can be plugged into the Input P of Tree Branch Component.

Permalink Reply by Emir Salkic on September 13, 2010 at 2:35am

Thanks for the answer but I have tried it and don't get any results. The problem is when I input the geometry list of 945 defined values into three ITEM LIST components I need to brake them into three groups of 315 but I cannot manage to do that. Here I am sending the grasshopper definition. Thanks

Attachments:

mostar.ghx, 901 KB

Permalink Reply by Danny Boyes on September 13, 2010 at 2:55am

hi emir,

I've added a path mapper component with {A;B;C}(i) --> {A;B} to your ghx file which collapses the last branch into the one above to give each branch 3 items to select from. Does this get what you need?
mostar_pathmapper.ghx

Permalink Reply by Emir Salkic on September 13, 2010 at 5:01am

Danny Thank you very very much. You are a life savior.
It works just fine. I was playing with pathmapper but didn't know how to define it exactly.

Permalink Reply by Danny Boyes on September 13, 2010 at 5:29am

Incidentally you could have used the Cull Pattern Component to achieve similar results but avoiding the Path Mapper.