482:2.2 朝向 Orientation 面的朝向表示面的法向与曲面法向之间的关系(Face orientation shows how face normal is aligned with its surface normal)。若面的朝向是TopAbs_... 171:1. Roman Lygin, OpenCascadenotes, opencascade.blogspot.com 2. 孙家广等. 计算机图形学. 清华大学出版社 3. OpenCascade source code. PDF Version: 41:Topolo...