PythonOCC基础使用：建模——三维特征运算（拉伸/放样/管道/沿路径放样

￡神魔★判官ぃ 2021-12-11 00:55 514阅读 0赞

**实现的国产云端CAD** [**www.yuntucad.com**][www.yuntucad.com]

### 1. 拉伸 ###

*  第一种情况：封闭曲线拉伸  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70]

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire, BRepBuilderAPI_MakeFace
    from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakePrism, BRepPrimAPI_MakeRevol
    from OCC.Core.gp import gp_Pnt, gp_Vec, gp_Ax1, gp_Dir
    
    E11 = BRepBuilderAPI_MakeEdge(gp_Pnt(40.,0.,0.), gp_Pnt(82.5,25.,0.)).Edge()
    E12 = BRepBuilderAPI_MakeEdge(gp_Pnt(82.5,25.,0.), gp_Pnt(42.5,93.,0.)).Edge()
    E13 = BRepBuilderAPI_MakeEdge(gp_Pnt(42.5,93.,0.), gp_Pnt(0.,68.,0.)).Edge()
    E14 = BRepBuilderAPI_MakeEdge(gp_Pnt(0.,68.,0.), gp_Pnt(40.,0.,0.)).Edge()
    W1 = BRepBuilderAPI_MakeWire(E11,E12,E13,E14)
    
    S =BRepPrimAPI_MakePrism(BRepBuilderAPI_MakeFace(W1.Wire()).Face(),gp_Vec(0.,0,50))
    
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(W1.Shape(),update=True)
        display.DisplayShape(S.Shape(), update=True)
    
    
    
        start_display()

*  第二种情况：非封闭曲线拉伸  
    \-![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 1]

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire, BRepBuilderAPI_MakeFace
    from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakePrism, BRepPrimAPI_MakeRevol
    from OCC.Core.gp import gp_Pnt, gp_Vec, gp_Ax1, gp_Dir
    
    E11 = BRepBuilderAPI_MakeEdge(gp_Pnt(40.,0.,0.), gp_Pnt(82.5,25.,0.)).Edge()
    E12 = BRepBuilderAPI_MakeEdge(gp_Pnt(82.5,25.,0.), gp_Pnt(42.5,93.,0.)).Edge()
    E13 = BRepBuilderAPI_MakeEdge(gp_Pnt(42.5,93.,0.), gp_Pnt(0.,68.,0.)).Edge()
    E14 = BRepBuilderAPI_MakeEdge(gp_Pnt(0.,68.,0.), gp_Pnt(40.,10.,0.)).Edge()
    W1 = BRepBuilderAPI_MakeWire(E11,E12,E13,E14)
    
    S =BRepPrimAPI_MakePrism(BRepBuilderAPI_MakeFace(W1.Wire()).Face(),gp_Vec(0.,0,50))
    
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(W1.Shape(),update=True)
        display.DisplayShape(S.Shape(), update=True)
    
    
    
        start_display()

*  第三种情况：空心图形拉伸

占坑。

### 2. 旋转拉伸 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 2]

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire, BRepBuilderAPI_MakeFace
    from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakePrism, BRepPrimAPI_MakeRevol
    from OCC.Core.gp import gp_Pnt, gp_Vec, gp_Ax1, gp_Dir
    
    E11 = BRepBuilderAPI_MakeEdge(gp_Pnt(40.,0.,0.), gp_Pnt(82.5,25.,0.)).Edge()
    E12 = BRepBuilderAPI_MakeEdge(gp_Pnt(82.5,25.,0.), gp_Pnt(42.5,93.,0.)).Edge()
    E13 = BRepBuilderAPI_MakeEdge(gp_Pnt(42.5,93.,0.), gp_Pnt(0.,68.,0.)).Edge()
    E14 = BRepBuilderAPI_MakeEdge(gp_Pnt(0.,68.,0.), gp_Pnt(40.,0.,0.)).Edge()
    W1 = BRepBuilderAPI_MakeWire(E11,E12,E13,E14)
    
    A=BRepPrimAPI_MakeRevol(BRepBuilderAPI_MakeFace(W1.Wire()).Face(),gp_Ax1(gp_Pnt(0,0,0),gp_Dir(0,1,0) ))
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(W1.Shape(), update=True)
        display.DisplayShape(A.Shape(), update=True)
        start_display()

### 3. 放样 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 3]

from OCC.Core.AIS import AIS_Shape
    from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire
    from OCC.Core.BRepOffsetAPI import BRepOffsetAPI_ThruSections
    from OCC.Core.gp import gp_Pnt
    from OCC.Display.SimpleGui import init_display
    
    # 做第一条封闭曲线（四边形）
    E11=BRepBuilderAPI_MakeEdge(gp_Pnt(40,0,0),gp_Pnt(82.5,25,0)).Edge()
    E12=BRepBuilderAPI_MakeEdge(gp_Pnt(82.5,25,0),gp_Pnt(42.5,93,0)).Edge()
    E13=BRepBuilderAPI_MakeEdge(gp_Pnt(42.5,93,0),gp_Pnt(0,68,0)).Edge()
    E14=BRepBuilderAPI_MakeEdge(gp_Pnt(0,68,0),gp_Pnt(40,0,0)).Edge()
    
    W1=BRepBuilderAPI_MakeWire(E11,E12,E13,E14)
    
    # 做第2条封闭曲线（三角形）
    E21=BRepBuilderAPI_MakeEdge(gp_Pnt(40,0,10),gp_Pnt(82.5,25,10)).Edge()
    E22=BRepBuilderAPI_MakeEdge(gp_Pnt(82.5,25,10),gp_Pnt(42.5,93,10)).Edge()
    E23=BRepBuilderAPI_MakeEdge(gp_Pnt(42.5,93,10),gp_Pnt(40,0,10)).Edge()
    
    W2=BRepBuilderAPI_MakeWire(E21,E22,E23)
    
    generator=BRepOffsetAPI_ThruSections(True)
    
    generator.AddWire(W1.Wire())
    generator.AddWire(W2.Wire())
    
    ais=AIS_Shape(generator.Shape())
    
    generator.Build()
    
    
    
    display, start_display, add_menu, add_function_to_menu = init_display()
    
    display.DisplayShape(W1.Shape(),update=True)
    display.DisplayShape(W2.Shape(),update=True)
    # display.DisplayShape(generator.Shape(),update=True)
    display.DisplayShape(ais.Shape(),update=True)
    start_display()

### 4. 管道（实体） ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 4]

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire, BRepBuilderAPI_MakeFace
    from OCC.Core.BRepOffsetAPI import BRepOffsetAPI_MakePipe
    from OCC.Core.gp import gp_Circ, gp_Ax2, gp_Pnt, gp_Dir
    
    
    E21=BRepBuilderAPI_MakeEdge(gp_Pnt(40,0,10),gp_Pnt(82.5,25,10)).Edge()
    E22=BRepBuilderAPI_MakeEdge(gp_Pnt(82.5,25,10),gp_Pnt(42.5,93,10)).Edge()
    
    W2=BRepBuilderAPI_MakeWire(E21,E22)
    
    c=gp_Circ(gp_Ax2(gp_Pnt(0, 0, 0), gp_Dir(0, 1, 0)), 10)
    
    Ec = BRepBuilderAPI_MakeEdge(c).Edge()
    Wc = BRepBuilderAPI_MakeWire(Ec).Wire()
    F = BRepBuilderAPI_MakeFace(Wc, True)
    S = BRepOffsetAPI_MakePipe(W2.Wire(), F.Shape())# 第一个参数 轨迹线，第二个参数是轮廓线
    
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(S.Shape(), update=True)
        start_display()

[www.yuntucad.com]: https://www.yuntucad.com
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