Missing intersect edges after intersect_with

Developers Ruby API
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1

I’ve been trying to get intersect edges by using intersect_with method but it seems like there are edges missing from this method.

trans1 = Geom::Transformation.new
trans2 = @first_group.transformation
g1_temp = @first_group.copy
edge = @ents.intersect_with(true, trans1, g1_temp.entities, trans2, false, @sec_group)

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The red lines is edges that I got after using intersect with and this matter only appeared when face not fully touching.
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It’s work properly in this case.

So, I wonder if i make any mistake on intersect_with method or there are conditions in intersection that I’m not aware of.

Note: I have to copy group since I have to delete the intersection edges after I have done in this process.

2

Although you did not publish a proper code and an example model that could help analyse the specific case…
I assume some similarities were reported here:
Face insensitive to the intersect_with method · Issue #786 · SketchUp/api-issue-tracker · GitHub

Anyway the #intersect_with method is “difficult” and not “perfectly” documented:
Add better examples for entities.intersect_with · Issue #741 · SketchUp/api-issue-tracker · GitHub

… so I can imagine mistakes from both parties (API vs. you ) :wink:

2 Likes
3

In this case do you have any suggest solution to find intersect edges instead of using intersect with or there’s any ways to fix this?

4

No, unfortunately I do not have a fix or other method in my mind to tell you. :blush:

BTW:

I guess the “native” (Using UI in Sketchup) Intersect Faces command will result the same ‘red lines’. Isn’t it?

5

It’s appeared to be that Intersect Faces command can use properly in this case. Is it a sign that a method working fine but I made a mistake somewhere?

6

This is all I use for method intersect_with. That’s why I’m so confused where can I fix my code and make them work properly :smiling_face_with_tear:.

7

How did you defined these?:
@first_group
@ents
@sec_group

Can you post your model you are testing?

What happen if you change the last parameter to:
@sec_group.entities

8

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Here is @first_group and @sec_group, @ents is Sketchup.active_model.active_entities.

I’m not sure is this a model you want :sweat_smile:. You can correct if I misunderstand something.

9

Sure, I can draw a model like on a picture, but to be able to precise, would be the best to experiment on exactly the same model.

1 Like
10

test_intersect.skp (188.1 KB)
Here is a file for this model.

For this one, last parameter have to be entity but if I use @sec_group.entities.to_a the result edges will appear to be on global reference which I can’t use for my other application after this.

11

:thinking:

mod = Sketchup.active_model
@ents = mod.entities
sel = mod.selection
@first_group = sel[0]
@sec_group = sel[1]
trans1 = Geom::Transformation.new
trans2 = @first_group.transformation
g1_temp = @first_group.copy
edges = @ents.intersect_with(true, trans1, g1_temp.entities, trans2, false, @sec_group)

ints

… Hm. Perhaps if you change the order of the groups you will get better result.

I used SU2021
(later on I will check in other version… I have a meeting now…)

1 Like
12

In my code I actually want intersection line to be in group with upper group. Can you try to change trans2 to @sec_group.transformation and check if it’s appeared to have just 2 edges.

I’m not sure that because there’s already have edges in that position so intersect_with decide not to create a new one or not. But there’s a case where the edge already exist and still the intersect with are create new edges on that position.

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(Thanks a lot for helping me!,)