Detection of closed loops in a sketch via iLogic.

[Diego_CamachoGomez]

Hello,

I am encountering a significant issue when attempting to automate the analysis of cross-sectional sketches generated in Autodesk Inventor 2025 via iLogic scripting.

Context:

• I use the “Project Cut Edges” feature on a planar offset from a base plane to create sketches representing cross sections of a solid part.

• These sketches clearly show multiple closed loops (profiles and internal “islands”) which:

  • Can be individually selected via the UI (Region Properties window),

  • Can be extruded separately,

  • Display area and other properties correctly in the user interface.

Issue:

• When accessing these sketches programmatically through the iLogic API, the Profiles collection of the sketch always returns empty (zero profiles), despite the loops visibly existing and being valid.

• Attempts to use SketchLoops or other collections to iterate through the internal loop geometry fail because these types are not accessible or defined in iLogic/VB.

• Forcing geometry to convert from reference to real, running Sketch Doctor, or rebuilding the sketch does not resolve the API’s inability to detect these profiles.

• This discrepancy between manual UI recognition of profiles and API access severely limits the ability to automate area calculations or cross section reports.

What I have tried:

• Using Project Cut Edges to generate the projected sketch,

• Inspecting the loops manually,

• Running Sketch Doctor to ensure no open or dangling edges,

• Forcing document updates and sketch edit cycles,

• Attempting to access SketchLoops and region properties programmatically (not supported),

• Converting all construction/reference lines to real geometry (no effect).

Outcome:

Still no profiles are reported by the API, making area calculations impossible to automate directly.

Request for assistance:

• Has anyone successfully accessed “Project Cut Edges” generated loops via Inventor iLogic API?

• Is there a recommended workaround or best practice to extract the area of all internal/external loops programmatically?

• Are there plans to expose SketchLoops or Region Properties collections in the API for future Inventor versions?

• Suggestions to help automate this process fully within Inventor would be appreciated.

Thank you in advance for any insights.

[J-Camper]

I believe the Profiles Count will be zero until they get added.  Try using this method [Profiles.AddForSolid] on the sketch before checking the count:

https://help.autodesk.com/view/INVNTOR/2023/ENU/?guid=GUID-5A9FA7CB-1EB9-4849-BB9D-11AD01F3DBF6

You will likely want to choose "false" for the combine input so you only get closed loops.