face normal direction
Could someone give my some hints about the followings pls?
Suppose a TopoDS_Shape aShape and aFace is one of its face. How to decide whether the normal direction of aFace is pointed inside of aShape?
Actually, aShape is a closed model built from a list faces as follows:
Then could someone tell me how to set aShell as a valid model so that the normal directions of its faces are all pointed outside its interior?