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scripting-how understand which side of a face is side1face during making region?

scripting-how understand which side of a face is side1face during making region?

scripting-how understand which side of a face is side1face during making region?

(OP)
Hello every one
I have some face instance and gonna to loading them by pressure. before loading I revise the face's normal to one direction as below:

if mdb.models['Model-1'].parts[PART_NAME].faces[0].getNormal()[2]>0:
mdb.models['Model-1'].parts[PART_NAME].flipNormal(regions=Region(mdb.models['Model-1'].parts[PART_NAME].faces.findAt(mdb.models['Model-1'].parts[PART_NAME].faces[0].pointOn)))

but seems it doesn't any effect on side1face and it doesn't flipped. so I cant recognize if side1face is in desire direction. so after loading all faces by uniform pressure, some of them pressured in reversed direction.
how I can control side1face during making region and after that pressuring that.

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