08-16-2016 04:29 PM
Is there a common reason for an error "face with negative area"? It was introduced by api_cover_circuits. I checked the face normal, coedges orientation, partner coedges orientation - everything looks fine, but ACIS check produces:
Insanity: face with negative area
Insanity severity: 0 -> ERROR: issue is an error.
Insanity subcategory: No sub category
Insanity details: ( area = -0.089738236043, relaccy = -1.000000000000 )
Solved! Go to Solution.
08-17-2016 07:24 PM
Often faces with negative area are sliver faces. To define the face area, ACIS sets up an integral of dA (the area element) over the UV parameters for the face. If the boundaries are bad (self intersecting), or the orientation is backwards, you can get a negative area face. It is a bug for an ACIS API to make faces like this. You may want to log it with support.
08-18-2016 07:56 AM
Yes - I'll report it as a bug.
The face looks perfect, not self-int., not sliver.
Backward orientation... It's not quite clear what to look here for: face's sense, coedges orientation, ...?