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()



效果图：



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