我们在这篇文章中绘制了带有holes的面，

本篇是在读取到外部文件如brep，igs，stp后获取面的性质，寻找面中的wires的正向与逆向

• 只显示外wire

from OCC.Extend.DataExchange import read_iges_file
from OCC.Core.TopExp import TopExp_Explorer
from OCC.Core.TopAbs import TopAbs_FACE, TopAbs_WIRE
from OCC.Core.TopoDS import topods
from OCC.Core.BRepAdaptor import BRepAdaptor_Surface
from OCC.Display.SimpleGui import init_display
from OCC.Core.ShapeAnalysis import shapeanalysis_OuterWire
from OCC.Display.OCCViewer import rgb_color# 加载零件模型文件
part = read_iges_file("assets/your_file.IGS")  # 替换为你的零件模型文件路径# 初始化3D视图
display, start_display, _, _ = init_display()# 设置颜色
highlight_color = (0.0, 0.0, 1.0)  # 蓝色# 遍历面
face_explorer = TopExp_Explorer(part, TopAbs_FACE)
while face_explorer.More():face = topods.Face(face_explorer.Current())#获取wire线wires=shapeanalysis_OuterWire(face)display.DisplayShape(wires, color=rgb_color(0,1,0))face_explorer.Next()# 显示3D视图
start_display()

只显示内wire

### 面的内外环线 https://blog.csdn.net/Mechanicoder/article/details/127477160from OCC.Extend.DataExchange import read_iges_file
from OCC.Core.TopExp import TopExp_Explorer
from OCC.Core.TopAbs import TopAbs_FACE, TopAbs_WIRE
from OCC.Core.TopoDS import topods
from OCC.Core.BRepAdaptor import BRepAdaptor_Surface
from OCC.Display.SimpleGui import init_display
from OCC.Core.ShapeAnalysis import shapeanalysis_OuterWire
from OCC.Display.OCCViewer import rgb_color# 加载零件模型文件
part = read_iges_file("assets/yourfile.IGS")  # 替换为你的零件模型文件路径# 初始化3D视图
display, start_display, _, _ = init_display()# 设置颜色
highlight_color = (0.0, 0.0, 1.0)  # 蓝色# 提取内部为空的平面的内部边界线
face_explorer = TopExp_Explorer(part, TopAbs_FACE)
while face_explorer.More():face = topods.Face(face_explorer.Current())# 目标：内环线inner_wires=[]# 获取所有线wire_explorer = TopExp_Explorer(face, TopAbs_WIRE)# 获取外环wire线outer_wires = shapeanalysis_OuterWire(face)while wire_explorer.More():wire = topods.Wire(wire_explorer.Current())if not wire.IsSame(outer_wires):inner_wires.append(wire)wire_explorer.Next()display.DisplayShape(inner_wires, color=rgb_color(0,0,1))face_explorer.Next()# 显示3D视图
start_display()

参考：
1，https://www.cnblogs.com/mechanicoder/p/16878903.html Open Cascade 获取面的内外环线
2. https://www.cnblogs.com/opencascade/p/MakeFaceWithHoles.html