How can I get the sloping line of the roof?

Revit
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1

There is a roof that is in a single plane. How do I get the slope defined line on this roof?

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2

I have a topic you can see way to find slope : Relationship Linear Regression With Pipe Slope | Hồ Văn Chương

3

I think you misunderstood. I want to get the line where the slope starts on the roof from the dynamo.

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4

edit: wrong track
sorry
edit2:
For a plane inclined by 3 points
Green line: Toggle line
Red line:
one of the slope lines from the highest point of the plane

12 février forum anglais_v2_2023-02-12_04-06-49
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Cordially
christian.stan

5

there is already existing roof. I click on the edit footprint of this roof. Here are the sketchlines of the roof. One of them has a slope defined. How can I get this sketchline as line in Dynamo?

6

Here to recover the curves of the roof

12 février forum anglais_rep3_2023-02-12_09-07-05
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12 février forum anglais_rep3.dyn (28.7 KB)

Cordially
christian.stan