Intersection of array of points

Grasshopper
,
1

Hello,
I am working on a creating walls using blocks in grasshopper. But I am stuck working with the intersection of walls (anyway I am working with points right now). Please check the image below.

Set difference question
Set difference question1920×1357 191 KB

This is what I want to do, Firstly I divided my interior walls by two directions X-axis and Y-axis. When I do the set difference for X-Axis wall I am getting it correct in only X-axis wall but the Y-Axis walls are wrong.
image
image887×701 252 KB

and when I do set difference for both the walls I am getting both of them wrong. like this
image
image886×717 92.1 KB

I dont wall the starting points of the wall to be deleted from the set difference but only the intersecting points in the middle of any wall should be deleted.
I think it can be easily understood when seen the script. I am attaching the script here. Any help would be appreciated, Thanks :slight_smile:
Set difference.gh (30.1 KB)

1 Like
2

This seems to accomplish your goal (culls duplicate points in middle of walls, leaves points at ends).

set_dif
set_dif1682×1230 472 KB

All changes follow the last Ungroup components in your file.

set_dif2
set_dif23020×1256 237 KB

231019_Set_difference_re01.gh (31.0 KB)

-Kevin

2 Likes
3

Hello @kev.r , Thank you so much and It is working. But actually after sending this question, I divided the points into blocks (like 5 points equals one block in the wall) and then made the wall with array of the resulted points and tried the same thing you did but I am getting a small problem near Tree split (I think the mask I am trying to give is wrong in this case)

image
image1841×762 143 KB

Here is the definition:
Set difference question
Set difference question1920×376 40.5 KB

Can you please check this once, Thank you again.
231019_Set_difference_re01.gh (64.9 KB)

4

After your changes, the DataTree after the last Ungroup component has this structure:

{A;B}
A = layer
B = segment (block)

You have eliminated the data indicating walls (brep indices). This makes it difficult to determine start / middle / end points of walls.

This seems to accomplish your initial goal. Ended up replacing most of your code after the block that divides the points into segments.

231021_Set_difference_re02.gh (62.6 KB)

-Kevin

5

Hello Kevin, Thank you so much. I was trying to solve this from two days, but I don’t have much knowledge about it.
Thank you for solving it for me :slight_smile: