Getting wrong SketchEntities from ProfileLoop - a bug in Fusion 360 C++ API

jiri.manak · ‎05-12-2020

Hello,

I am developing add-in, which makes further actions over a SketchProfile selected by a user. I am trying to get SketchEntities of a ProfileLoop. In some special cases I get one segment twice and one is missing. The special case is when user creates sketch manually - it is not imported as a DXF (for example).

It can be reproduced by this steps:

create new sketch on XY plane
draw fit spline
add 3 line segments
add a rectangle crossing bottom line
trim the segments to extend the profile

for an illustration there is a screenshot attached

Processing it in my code (c++) I get following trace output. It shows a list of start and end points of the loop segments.

There are 8 segments (SketchEntity)

IDX = 01 and IDX = 05 are the same. (01 and 05 are for this kind of shape made by this steps always the same)

One segment is missing.

[2020-05-12 10:34:51.193] [glchan] [debug] ProfileLoop Size: 8
[2020-05-12 10:34:51.193] [glchan] [debug]    IDX = 00   adsk::fusion::SketchLine
[2020-05-12 10:34:51.193] [glchan] [debug]    Start: [ 20.00, -72.50,   0.00]
[2020-05-12 10:34:51.193] [glchan] [debug]    End: [ 20.00, -95.00,   0.00]
[2020-05-12 10:34:51.193] [glchan] [debug]  
[2020-05-12 10:34:51.193] [glchan] [debug]    IDX = 01   adsk::fusion::SketchLine
[2020-05-12 10:34:51.194] [glchan] [debug]    Start: [-61.83, -72.50,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]    End: [-30.00, -72.50,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]  
[2020-05-12 10:34:51.194] [glchan] [debug]    IDX = 02   adsk::fusion::SketchLine
[2020-05-12 10:34:51.194] [glchan] [debug]    Start: [ 41.05, -72.50,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]    End: [ 68.09, -17.72,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]  
[2020-05-12 10:34:51.194] [glchan] [debug]    IDX = 03   adsk::fusion::SketchFittedSpline
[2020-05-12 10:34:51.194] [glchan] [debug]    Start: [ 68.09, -17.72,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]    End: [-61.83, -30.10,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]  
[2020-05-12 10:34:51.194] [glchan] [debug]    IDX = 04   adsk::fusion::SketchLine
[2020-05-12 10:34:51.194] [glchan] [debug]    Start: [-61.83, -30.10,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]    End: [-61.83, -72.50,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]  
[2020-05-12 10:34:51.194] [glchan] [debug]    IDX = 05   adsk::fusion::SketchLine
[2020-05-12 10:34:51.194] [glchan] [debug]    Start: [-61.83, -72.50,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]    End: [-30.00, -72.50,   0.00]
[2020-05-12 10:34:51.194] [glchan] [debug]  
[2020-05-12 10:34:51.194] [glchan] [debug]    IDX = 06   adsk::fusion::SketchLine
[2020-05-12 10:34:51.194] [glchan] [debug]    Start: [-30.00, -95.00,   0.00]
[2020-05-12 10:34:51.195] [glchan] [debug]    End: [-30.00, -72.50,   0.00]
[2020-05-12 10:34:51.195] [glchan] [debug]  
[2020-05-12 10:34:51.195] [glchan] [debug]    IDX = 07   adsk::fusion::SketchLine
[2020-05-12 10:34:51.195] [glchan] [debug]    Start: [ 20.00, -95.00,   0.00]
[2020-05-12 10:34:51.195] [glchan] [debug]    End: [-30.00, -95.00,   0.00]

The code is quite complex to be published here but it uses

ProfileLoop -> ProfileCurves -> ProfileCurve -> SketchEntity to get 'entity'

casting 'entity' to appropriate Sketch object to get

geometry()->evaluator()

and finally

evaluator()->getEndPoints(start_point, end_point))

to get start and end points

Let me know if my description is clear.

Is this the right place to submit this bug?

Jiri