初步了解VTK装配体

VTK还不太了解，根据资料，

vtk.vtkAssembly 是 VTK库中的一个重要类，允许通过将多个vtkActor对象组合在一起来创建复杂的3D模型。

import vtk
import math
from vtk.util.colors import *filenames = ["cylinder.stl","sphere.stl","torus.stl"]
dt = 1.0
renWin = vtk.vtkRenderWindow()
actor  = list()
joint1 = vtk.vtkAssembly()  
joint2 = vtk.vtkAssembly()
joint3 = vtk.vtkAssembly()class MyInteractor(vtk.vtkInteractorStyleTrackballCamera):def __init__(self,parent=None):self.AddObserver("CharEvent",self.OnCharEvent)self.AddObserver("KeyPressEvent",self.OnKeyPressEvent)def OnCharEvent(self,obj,event):passdef OnKeyPressEvent(self,obj,event):global anglekey = self.GetInteractor().GetKeySym()if(key == "Left"):joint1.RotateY(-dt)      if(key == "Right"):joint1.RotateY(dt)if(key == "Up"):joint2.RotateY(-dt)           if(key == "Down"):joint2.RotateY(dt)if(key == "a"):joint3.RotateY(-dt)           if(key == "d"):joint3.RotateY(dt)renWin.Render()returndef LoadSTL(filename):reader = vtk.vtkSTLReader()reader.SetFileName(filename)mapper = vtk.vtkPolyDataMapper() mapper.SetInputConnection(reader.GetOutputPort())actor = vtk.vtkLODActor() actor.SetMapper(mapper)return actor  def CreateScene():ren = vtk.vtkRenderer()renWin.AddRenderer(ren)iren = vtk.vtkRenderWindowInteractor()iren.SetRenderWindow(renWin)style = MyInteractor()style.SetDefaultRenderer(ren)iren.SetInteractorStyle(style)for id, file in enumerate(filenames):actor.append(LoadSTL(file))r = vtk.vtkMath.Random(.4, 1.0)g = vtk.vtkMath.Random(.4, 1.0)b = vtk.vtkMath.Random(.4, 1.0)actor[id].GetProperty().SetDiffuseColor(r, g, b)actor[id].GetProperty().SetDiffuse(.8)actor[id].GetProperty().SetSpecular(.5)actor[id].GetProperty().SetSpecularColor(1.0,1.0,1.0)actor[id].GetProperty().SetSpecularPower(30.0)joint1.AddPart(actor[0])joint1.AddPart(joint2)joint2.AddPart(actor[1])joint2.AddPart(joint3)joint3.AddPart(actor[2])joint2.SetOrigin(100, 0, 0)  # initial elbow joint positionjoint3.SetOrigin(200, 0, 0)  # initial wrist joint positionren.AddActor(joint1)ren.GradientBackgroundOn()ren.SetBackground(.1, .1, .1)ren.SetBackground2(0.8,0.8,0.8)renWin.SetSize(600, 600)iren.Initialize()iren.Start()if __name__ == "__main__":CreateScene()

这是网上的代码，它可以对多个STL文件进行装配；我随便找的stl文件，先看一下初步效果；如果有正确的多个文件，就能装配自己的复杂模型，和模型动画；

开始它定义了3个变量，

joint1 = vtk.vtkAssembly()
joint2 = vtk.vtkAssembly()
joint3 = vtk.vtkAssembly()

joint是关节的意思，定义了3个关节；

一开始出来是这样的，