how to output nested list as a tree?

Hi,

I am trying to generate Penrose tiling using inflation-deflation method. I use a nested list to store the tiling pattern, but the output of the nested list shows no data, only description of the data type (Generic list).

Is there a way to output the nested list as a tree? Or is there any other data type that could do the job?

Thanks a lot!

Versions: Rhino5 and Grasshopper 0.8.0066

The file and screenshot are attached

Attachments:

NestedList.jpg, 79 KB
NestedListOfDouble.gh, 4 KB

Replies to This Discussion

Permalink Reply by David Rutten on June 25, 2012 at 3:10am

You cannot output nested collections, you must convert them into a tree first.

Dim penroseTree As New DataTree(Of Double)
For i As Int32 = 0 To PenroseTiles2.Count - 1
penroseTree.AddRange(PenroseTiles2(i), New GH_Path(i))
Next

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

NestedListOfDouble.gh, 4 KB

Permalink Reply by Wendong Wang on June 25, 2012 at 7:51am

Thank you David!

Where can I get more information about DataTree and GH_Path? I couldn't find them on RhinoCommon or MSDN.

Permalink Reply by David Rutten on June 25, 2012 at 7:57am

DataTrees are defined inside the Grasshopper SDK. Neither RhinoCommon nor Microsoft 'know' they exist. You can download the Grasshopper SDK documentation via the Help menu, and I'm hoping to put a version online somewhere soon too.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Wendong Wang on June 25, 2012 at 9:00am

Thanks!

Permalink Reply by Wendong Wang on June 25, 2012 at 4:28pm

Hi David,

The nested list in my VB script seems to get modified unexpected. To be specific, "penroseTiling2" behaves normal on its own, but after the addition of the code for creating the next generation of tiles (penroseTiling3), it got modified without any code that modifies it. I couldn't figure out why.

I am wondering if it is related to the way how the code is parsed.

Thanks!

File is attached.

Attachments:

ListBehaviorWierd.gh, 6 KB

Permalink Reply by David Rutten on June 25, 2012 at 5:02pm

List(Of Double) is a reference type. When you put one into a List(Of List(Of Double), then modify the original list later on, it will change everywhere.