Expose functionality to detect self-intersecting polygons

[Peter77]

When importing a FBX file, Unity is able to detect self-intersecting polys and outputs a warning to the Console, for example:

@""

A polygon of rock_body41 is self-intersecting and has been discarded.

I would find it useful if you expose the functionality to detect self-intersecting polygons. This would allow me to write a tool that checks for these kind of issues, without having the need to trigger a reimport.

I could add this to our data validation checks then. Otherwise we only see such issues on an import, which then people often forget there is an issue.

[jimmack]

The problem I’ve got with that message is that it doesn’t tell me which polygon is causing the problem. Can you point me in the right direction to identify which on of the polys on my Blender model might be the issue?

Just a thought: If Unity would highlight any discarded polys, that would be vastly more useful.

[jimmack]

@jimmack

The problem I’ve got with that message is that it doesn’t tell me which polygon is causing the problem. Can you point me in the right direction to identify which on of the polys on my Blender model might be the issue?

I found a way to find potential problem areas and clean them up in Blender so I’ll add a quick description here in case it’s helpful to anyone else that comes across this thread. It’s not a direct route to the answer, but it sorted things out for me.

This is for Blender 2.82.

Select the troublesome object and go into edit mode. Under the Select menu choose Select All by Trait | Faces by Sides, then set the options to:

Number of Vertices: 4
Type: Greater Than

This will select all the N-Gons (Unity divides these up on import, and it’s the most likely area to find the issues).

From here, I was able to identify several suspicious areas of my model and improve the topology. This fixed the issue.

I still think it would be helpful if Unity could provide more information to help identify the location of the polygon it has identified.

[creafourc]

Could I ignore this warning?