python绘制立方体的方法

本文实例为大家分享了python绘制立方体的具体代码，供大家参考，具体内容如下

#!/usr/bin/env python # This is (almost) a direct C++ to Python transliteration of# <VTK-root>/Examples/DataManipulation/Cxx/Cube.cxx from the VTK# source distribution, which "shows how to manually create vtkPolyData"## A convenience function, mkVtkIdList(), has been added and one if/else# so the example also works in version 6 or later.## Lines like `obj->Delete()` have been transliterated as `del obj` to,# preserve the resemblance to the original C++ example, although I# doubt this achieves anything beyond what Python's garbage collection# would do anyway. import vtk # Makes a vtkIdList from a Python iterable. I'm kinda surprised that# this is necessary, since I assumed that this kind of thing would# have been built into the wrapper and happen transparently, but it# seems not.  def mkVtkIdList(it): vil = vtk.vtkIdList() for i in it:  vil.InsertNextId(int(i)) return vil # 绘制通用方法def myShow(cube): # Now we'll look at it. cubeMapper = vtk.vtkPolyDataMapper() if vtk.VTK_MAJOR_VERSION <= 5:  cubeMapper.SetInput(cube) else:  cubeMapper.SetInputData(cube) cubeMapper.SetScalarRange(0, 7) cubeActor = vtk.vtkActor() cubeActor.SetMapper(cubeMapper)  # The usual rendering stuff. camera = vtk.vtkCamera() camera.SetPosition(1, 1, 1) camera.SetFocalPoint(0, 0, 0)  renderer = vtk.vtkRenderer() renWin = vtk.vtkRenderWindow() renWin.AddRenderer(renderer)  iren = vtk.vtkRenderWindowInteractor() iren.SetRenderWindow(renWin)  renderer.AddActor(cubeActor) renderer.SetActiveCamera(camera) renderer.ResetCamera() renderer.SetBackground(0, 0, 0)  renWin.SetSize(300, 300)  # interact with data renWin.Render() iren.Start() del cubeMapper del cubeActor del camera del renderer del renWin del iren def main(): # x = array of 8 3-tuples of float representing the vertices of a cube: # 8个三维值代表长方体的8个顶点 x = [(0.0, 0.0, 0.0), (1.0, 0.0, 0.0), (1.0, 1.0, 0.0), (0.0, 1.0, 0.0),   (0.0, 0.0, 1.0), (1.0, 0.0, 1.0), (1.0, 1.0, 1.0), (0.0, 1.0, 1.0)]  # pts = array of 6 4-tuples of vtkIdType (int) representing the faces #  of the cube in terms of the above vertices # 点的编号0-7，每个面由4个点组成 pts = [(0, 1, 2, 3), (4, 5, 6, 7), (0, 1, 5, 4),   (1, 2, 6, 5), (2, 3, 7, 6), (3, 0, 4, 7)]  # We'll create the building blocks of polydata including data attributes. cube = vtk.vtkPolyData() points = vtk.vtkPoints() polys = vtk.vtkCellArray() scalars = vtk.vtkFloatArray()  # Load the point, cell, and data attributes. for i in range(8):  points.InsertPoint(i, x[i]) for i in range(6):  polys.InsertNextCell(mkVtkIdList(pts[i])) for i in range(8):  scalars.InsertTuple1(i, i)  # We now assign the pieces to the vtkPolyData. cube.SetPoints(points) del points cube.SetPolys(polys) del polys cube.GetPointData().SetScalars(scalars) del scalars  myShow(cube) # Clean up del cube main()