00 pythonocc下载安装

一、简介

pythonOCC也就是opencascade的python封装版本，是由tpaviot制作并发行的。这里是tpaviot制作者Github的主页官方api函数网页查询（需翻墙）：https://cdn.rawgit.com/tpaviot/pythonocc-core/804f7f3/doc/apidoc/0.18.1/#indices-and-tables ，同时可以对照着 https://www.opencascade.com/doc/occt-6.9.1/refman/html/index.html OCCT的api进行查看pythonocc简介：pythonOCC是python语言构架的 3D CAD/CAE/PLM开发框架，它提供了如下功能：复杂曲面的操作，信息转换（STEP,IGES,STL格式），用户界面可视化（基于wxpython库或者qt库），jupyter nootbook生成等。

能够提供如下操作：2D和3D几何建模工具包让我们能够对任何类型的对象进行建模：

创建基本体，如棱柱、圆柱、圆锥、圆环面布尔操作（交、并、补）倒角、倒圆角与草图操作平移、抽壳、打孔和扫略建模计算属性，如表面面积，体积，重心和曲率进行投影、插补和近似操作可视化模块能够让你管理模型的显示，以及操作视图。分为六大模块

image

二、下载安装

1、所需材料

anacondaAnaconda指的是一个开源的Python发行版本，其包含了conda、Python等180多个科学包及其依赖项。使用anaconda配置环境，则可以免去相当多的手动配置烦恼。可以在这里进行下载安装包：anaconda下载地址

2、安装

在anaconda prompt运行

conda create-npythonocc-cconda-forge-ctpaviot-cdlr-sc-cpythonocc-cocepythonocc-core==0.18.1python=3.5

按道理说这里等待安装完毕就ok了，但是我这老机子就是装不上。

尝试安装一下版本

conda create-npythonocc-cconda-forge-ctpaviot-cdlr-sc-cpythonocc-cocepythonocc-core==0.17.2python=3.5

安装ok

3、版本

上面安装了0.17.2的版本，奈何网上的教程都是0.18.x版本的了。无奈只有去下安装包来升级。

去别的电脑上下载了0.18.1版本的压缩包，最新的0.18.2硬是找不到。。。

https://conda.anaconda.org/oce/win-64

https://conda.anaconda.org/pythonocc/win-64

使用conda升级

conda install--use-localyour-pkg-name

在github拿个例子来运行一下

#!/usr/bin/env python

# -*- coding:utf-8 -*-



##Copyright 2009-2015 Thomas Paviot (tpaviot@gmail.com)

##

##This file is part of pythonOCC.

##

##pythonOCC is free software: you can redistribute it and/or modify

##it under the terms of the GNU Lesser General Public License as published by

##the Free Software Foundation, either version 3 of the License, or

##(at your option) any later version.

##

##pythonOCC is distributed in the hope that it will be useful,

##but WITHOUT ANY WARRANTY; without even the implied warranty of

##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

##GNU Lesser General Public License for more details.

##

##You should have received a copy of the GNU Lesser General Public License

##along with pythonOCC.  If not, see <http://www.gnu.org/licenses/>.



importmath



fromOCC.gpimportgp_Pnt,gp_OX,gp_Vec,gp_Trsf,gp_DZ,gp_Ax2,gp_Ax3,gp_Pnt2d,gp_Dir2d,gp_Ax2d

fromOCC.GCimportGC_MakeArcOfCircle,GC_MakeSegment

fromOCC.GCE2dimportGCE2d_MakeSegment

fromOCC.GeomimportGeom_Plane,Geom_CylindricalSurface,Handle_Geom_Plane,Handle_Geom_Surface

fromOCC.Geom2dimportGeom2d_Ellipse,Geom2d_TrimmedCurve,Handle_Geom2d_Ellipse,Handle_Geom2d_Curve

fromOCC.BRepBuilderAPIimportBRepBuilderAPI_MakeEdge,BRepBuilderAPI_MakeWire,BRepBuilderAPI_MakeFace,\

BRepBuilderAPI_Transform

fromOCC.BRepPrimAPIimportBRepPrimAPI_MakePrism,BRepPrimAPI_MakeCylinder

fromOCC.BRepFilletAPIimportBRepFilletAPI_MakeFillet

fromOCC.BRepAlgoAPIimportBRepAlgoAPI_Fuse

fromOCC.BRepOffsetAPIimportBRepOffsetAPI_MakeThickSolid,BRepOffsetAPI_ThruSections

fromOCC.BRepLibimportbreplib

fromOCC.BRepimportBRep_Tool_Surface,BRep_Builder

fromOCC.TopoDSimporttopods,TopoDS_Edge,TopoDS_Compound

fromOCC.TopExpimportTopExp_Explorer

fromOCC.TopAbsimportTopAbs_EDGE,TopAbs_FACE

fromOCC.TopToolsimportTopTools_ListOfShape

fromOCC.Display.SimpleGuiimport*

fromOCC.Extend.DataExchangeimportwrite_step_file





defface_is_plane(face):

"""

   判断 TopoDS_Shape 是不是 plane

   """

hs=BRep_Tool_Surface(face)

downcast_result=Handle_Geom_Plane.DownCast(hs)

# 不能通过Handle_Geom_Plane转换的不是平面

returnnotdowncast_result.IsNull()





defgeom_plane_from_face(aFace):

"""

   通过  planar surface 得到 geometric plane

   """

returnHandle_Geom_Plane.DownCast(BRep_Tool_Surface(aFace)).GetObject()





height=70

width=50

thickness=30



if1:

# 准备用来创建 瓶身 的点

aPnt1=gp_Pnt(-width/2.0,0,0)

aPnt2=gp_Pnt(-width/2.0,-thickness/4.0,0)

aPnt3=gp_Pnt(0,-thickness/2.0,0)

aPnt4=gp_Pnt(width/2.0,-thickness/4.0,0)

aPnt5=gp_Pnt(width/2.0,0,0)



# 瓶底断面线段和圆弧

aArcOfCircle=GC_MakeArcOfCircle(aPnt2,aPnt3,aPnt4)

aSegment1=GC_MakeSegment(aPnt1,aPnt2)

aSegment2=GC_MakeSegment(aPnt4,aPnt5)



# 除了下面的方法, 也可以不用上面的segment,而通过点直接创建线段edges

aEdge1=BRepBuilderAPI_MakeEdge(aSegment1.Value())

aEdge2=BRepBuilderAPI_MakeEdge(aArcOfCircle.Value())

aEdge3=BRepBuilderAPI_MakeEdge(aSegment2.Value())



# 通过edges 创建 wire

aWire=BRepBuilderAPI_MakeWire(aEdge1.Edge(),aEdge2.Edge(),aEdge3.Edge())



# 得到X轴的便捷方式

xAxis=gp_OX()



# 设置镜像轴

aTrsf=gp_Trsf()

aTrsf.SetMirror(xAxis)



# 应用镜像变换

aBRespTrsf=BRepBuilderAPI_Transform(aWire.Wire(),aTrsf)



# 得到镜像 shape

aMirroredShape=aBRespTrsf.Shape()



# 通过通用shape得到 wire

aMirroredWire=topods.Wire(aMirroredShape)



# 组合两个wire

mkWire=BRepBuilderAPI_MakeWire()

mkWire.Add(aWire.Wire())

mkWire.Add(aMirroredWire)

myWireProfile=mkWire.Wire()



# 创建用于体拉伸 sweep 的面

myFaceProfile=BRepBuilderAPI_MakeFace(myWireProfile)



# 我们把面沿Z轴拉伸到指定高度

aPrismVec=gp_Vec(0,0,height)

myBody=BRepPrimAPI_MakePrism(myFaceProfile.Face(),aPrismVec)



# 通过explorer对所有边加倒角

mkFillet1=BRepFilletAPI_MakeFillet(myBody.Shape())

anEdgeExplorer=TopExp_Explorer(myBody.Shape(),TopAbs_EDGE)



whileanEdgeExplorer.More():

anEdge=topods.Edge(anEdgeExplorer.Current())

print(anEdge)

mkFillet1.Add(thickness/12.0,anEdge)



anEdgeExplorer.Next()



myBody=mkFillet1



# 创建瓶颈

neckLocation=gp_Pnt(0,0,height)

neckAxis=gp_DZ()

neckAx2=gp_Ax2(neckLocation,neckAxis)



myNeckRadius=thickness/4.0

myNeckHeight=height/10.0



mkCylinder=BRepPrimAPI_MakeCylinder(neckAx2,myNeckRadius,myNeckHeight)



myBody=BRepAlgoAPI_Fuse(myBody.Shape(),mkCylinder.Shape())



# 下面找到Z最高的面, 并将它移除

faceToRemove=None

zMax=-1



# 遍历所有的面, 查找Z最高的面

aFaceExplorer=TopExp_Explorer(myBody.Shape(),TopAbs_FACE)

whileaFaceExplorer.More():

aFace=topods.Face(aFaceExplorer.Current())



ifface_is_plane(aFace):

aPlane=geom_plane_from_face(aFace)



aPnt=aPlane.Location()

aZ=aPnt.Z()

ifaZ>zMax:

zMax=aZ

faceToRemove=aFace



aFaceExplorer.Next()



facesToRemove=TopTools_ListOfShape()

facesToRemove.Append(faceToRemove)



myBody=BRepOffsetAPI_MakeThickSolid(myBody.Shape(),facesToRemove,-thickness/50.0,0.001)





# 建立需要创建螺纹的瓶颈表面

neckAx2_Ax3=gp_Ax3(neckLocation,gp_DZ())

aCyl1=Geom_CylindricalSurface(neckAx2_Ax3,myNeckRadius*0.99)

aCyl2=Geom_CylindricalSurface(neckAx2_Ax3,myNeckRadius*1.05)



# 建立创建螺纹的曲线

aPnt=gp_Pnt2d(2.0*math.pi,myNeckHeight/2.0)

aDir=gp_Dir2d(2.0*math.pi,myNeckHeight/4.0)

anAx2d=gp_Ax2d(aPnt,aDir)



aMajor=2.0*math.pi

aMinor=myNeckHeight/5.0



anEllipse1=Geom2d_Ellipse(anAx2d,aMajor,aMinor)

anEllipse2=Geom2d_Ellipse(anAx2d,aMajor,aMinor/8.0)



anArc1=Geom2d_TrimmedCurve(Handle_Geom2d_Ellipse(anEllipse1),0,math.pi)

anArc2=Geom2d_TrimmedCurve(Handle_Geom2d_Ellipse(anEllipse2),0,math.pi)



anEllipsePnt1=anEllipse1.Value(0)

anEllipsePnt2=anEllipse1.Value(math.pi)



aSegment=GCE2d_MakeSegment(anEllipsePnt1,anEllipsePnt2)



# 构建用于螺纹的边和环

anEdge1OnSurf1=BRepBuilderAPI_MakeEdge(Handle_Geom2d_Curve(anArc1),Handle_Geom_Surface(aCyl1))

anEdge2OnSurf1=BRepBuilderAPI_MakeEdge(aSegment.Value(),Handle_Geom_Surface(aCyl1))

anEdge1OnSurf2=BRepBuilderAPI_MakeEdge(Handle_Geom2d_Curve(anArc2),Handle_Geom_Surface(aCyl2))

anEdge2OnSurf2=BRepBuilderAPI_MakeEdge(aSegment.Value(),Handle_Geom_Surface(aCyl2))



threadingWire1=BRepBuilderAPI_MakeWire(anEdge1OnSurf1.Edge(),anEdge2OnSurf1.Edge())

threadingWire2=BRepBuilderAPI_MakeWire(anEdge1OnSurf2.Edge(),anEdge2OnSurf2.Edge())



# 计算边和环的三维表现

breplib.BuildCurves3d(threadingWire1.Shape())

breplib.BuildCurves3d(threadingWire2.Shape())



# 创建螺纹的表面

aTool=BRepOffsetAPI_ThruSections(True)

aTool.AddWire(threadingWire1.Wire())

aTool.AddWire(threadingWire2.Wire())

aTool.CheckCompatibility(False)

myThreading=aTool.Shape()



myBody=BRepAlgoAPI_Fuse(myBody.Shape(),myThreading)

write_step_file(myBody.Shape(),'aaa.stp')

# # 构建组合结果

# aRes = TopoDS_Compound()

# aBuilder = BRep_Builder()

# aBuilder.MakeCompound(aRes)

# aBuilder.Add(aRes, myBody.Shape())

# aBuilder.Add(aRes, myThreading)



# myBody = BRepAlgoAPI_Fuse(myBody.Shape(), myThreading)



# from OCC.Extend.DataExchange import write_step_file

# write_step_file(myBody, 'pipe/fuse.stp')

display,start_display,add_menu,add_function_to_menu=init_display()

display.DisplayColoredShape(mkFillet1.Shape())



start_display()

运行报错，无Core、Extend包

0.18.1版本的就是没有Core包，直接删除掉Core发现没报错

Extend包确实没有，这里需要去github上下载下来

https://github.com/tpaviot/pythonocc-core/tree/master/src

然后将Extend包复制到anaconda虚拟环境下的OCC包里，我的路径是这样的

D:\anaconda3\envs\pythonocc\Lib\site-packages\OCC

再次运行代码，示例瓶子绘制成功。