API implementation getting crazy

[A.BeeseH8JKW]

Hello everyone,
I have a problem that I simply cannot solve on my own without help.
I am using an API to create somewhat more complex components.
These are created by using sketches and the Elevation operation.
Since arcs are used in the 3D sketch, a leading edge must be selected to use the elevation.
It has now been noticed that created lines/arcs are connected to each other using the smallest arcs.
This is not stored in the API and cannot be explained.
Unfortunately, a support request to Autodesk has already been rejected.

Do you have any idea why these unwanted arcs are created by Inventor?

I cannot upload the API, but I can upload an excerpt for the line creation.

Thank you for your efforts
Alex

Translated with DeepL.com (free version)

[bradeneuropeArthur]

Please share some pictures or files to explain what you mean.

[Frederick_Law]

You're not coding API.

You're using Inventor API to code.

Sketch3DOptions:

https://help.autodesk.com/view/INVNTOR/2025/ENU/?guid=GUID-Sketch3DOptions

[abdullah_elq]

Try setting this value to 0

[A.BeeseH8JKW]

Hello,
I have inserted a screenshot of the sketch here.
For explanation
1st section: 200mm length
2nd section: 900mm length

However, you can see an R5
I can't understand that.

[cidhelp]

Hello @A.BeeseH8JKW ,

if you use the API-Command SketchLines3D.AddByTwoPoints, then there is a third parameter called UseAutoBend:

oSk.SketchLines3D.AddByTwoPoints(oPt1, oPt2) - UseAutoBend is on

oSk.SketchLines3D.AddByTwoPoints(oPt1, oPt2, False) - UseAutoBend is off