Re-order a list of exploded surfaces

Geometry
1

Hello,

Here is my problem. I have 4 solids (That are beams). I exploded them with the outcome to choose only the surfaces marked in image 1. After exploding them dynamo create 4 lists with the surfaces. The problem is that dynamo put the surfaces of each list in in different order. For example in the beam showed in Imagine 2 the indexes of the surfaces that I need are 0 and 5 but in beam showed in Image 3 the indexes of the surfaces that I need are 2 and 3. Is there any way to re-order the sub-list so the surfaces in all the list follow the same index order?

Image 1
Image 1.png1594×891 69 KB

Image 2
Image 2.png1334×858 57.4 KB

Image 3
Image 3.png1594×882 69.4 KB

2

You could filter them based on their geometry, eg if the normal to said surface is parallel to the beam itself.

3

I think it’s reasonable to assume that those surfaces are those with the smallet area in the sets :

image
image.png1527×524 38.4 KB

2 Likes
4

Or you could do it like this (more robust), using the direction of the location curve and the surface normals :

image
image.png1881×544 67.6 KB

1 Like
5

I like your first solution better - and I think it’s more robust, too. Your second solution assumes that the location curve is always a straight line which may not necessarily be the case.

1 Like
6

@Mostafa_El_Ayoubi, Thank you very much for the answer. Both solutions worked perfect.