tree stumper

Hello all,

I'm pretty new to GH, and already have my mind fully twisted around a puzzle i've constructed for myself out of data trees.

My problem boils down to this: I have two data trees:

TREE A TREE B

{0} n=1 {0;1} n=4

{1} n=1 {0;4} n=4

{2} n=1 {1;1} n=4

{1;2} n=4

{1;3} n=4

{1;4} n=4

{2;1} n=2

{2;2} n=4

{2;3} n=4

{2;4} n=4

Both trees are generated from sliders, so could have any number of branches, although they are tied together. Tree A is a set of division points on a line, Tree B is a set of intersections from lines generated radially from the first (in this case three) points. I am trying to perform a "closest point" operation between the first tree and the second tree-- only, I do not want them to cross list, or long or short list. I want the {0} point to operate with those entries in the 2nd tree that start with {0,x}. So it would look like

{0} --> closest point with {0;1},{0;4}

{1} --> closest point with {1;1},{1,2},{1,3},{1,4} etc

I cannot figure out how this works. What I am visually trying to do is cast rays from a string of points so that they stop when they encounter another curve. I am having trouble picking through the intersection events to get what I want. Check the attached files for some clarity. THANK YOU

Attachments:

rays.3dm, 41 KB
rays.gh, 7 KB

Replies to This Discussion

Permalink Reply by Yoann Mescam (Systemiq) on February 5, 2012 at 1:35am

PShift (Shift Paths) should help, the same can be done with Pathmapper btw.

Unless I misunderstood your question.

PS: Dont you want to use Isovist?

Permalink Reply by Martin Dembski on February 5, 2012 at 2:02am

Hi Jorudan,

I hope that I understood it in the right way.

First I also thought like Systemiq but then I thought you mean it in an other way.

Just have a look at the attached there is a small difference in the result to Systemiq's version.

Hope this helps.

Best,

Martin.

Permalink Reply by Martin Dembski on February 5, 2012 at 2:03am

Sry, I forgot to attach the files. ^^"

Attachments:

rays (bearbeitet).3dm, 73 KB
rays (bearbeitet).gh, 10 KB

Permalink Reply by Yoann Mescam (Systemiq) on February 5, 2012 at 4:06am

Martin is right, and here is Isovist version (to feel useful).

Attachments:

rays-Isovist.gh, 6 KB

Permalink Reply by Martin Dembski on February 5, 2012 at 5:17am

I think your Isovist Ray version is much smarter.

Permalink Reply by Joshua Jordan on February 5, 2012 at 9:43am

Hi and thank you for both solutions, exactly what I was looking for... I was using the previous release of Grasshopper and unaware the isovist command even existed!

Either way your solutions were very helpful in getting me to understand the kinds of operations available on data trees, so thanks again.

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