I have a problem. Could you help me, please.
I have translated IGESfile(simple solid cube) created in Pro/Engineer to OpenCASCADE shape through IGES DataExchange Module. and i try to find Face Normal Vector(using GeomLProp_SLProps) in translated shape with TopoDS_Wire data, but i have a not understanding problem. in other words, A few candidate sewing edges have same direction. I thought that candidate sewing edges of normal B-Rep Data Structure have different direction , but a few of translated shapes(translated cube IGESSfile) have same direction. I'd like to know this reason. and I'd like to know how to find Face Normal Vector in OpenCASCADE shape(translated IGES file), and If you have another data structures of Face, where to find another Loop Data Structure of Face(surface).
from Park jw in South Korea.