VTK-py读取与显示相关函数

在VTK中可视化数据的一般流程如下：

文件输入相关函数：

https://www.vtk.org/Wiki/VTK/Examples/Cxx#Input_and_Output

Readers ● Reads data from file

Filters ● Takes data as input, modifies it in some way, and returns the modified data

Mappers ● Maps data to graphics primitives (points, lines, or triangles) that can be displayed by the renderer

Actors ● vtkActor represents an object (geometry and properties) in a rendering scene

Rendering ● The process of converting 3D graphics primitives (points, lines, triangles, etc), a specification for lights and materials, and a camera view into an 2D image that can be displayed on the screen

Renderer ● vtkRenderer controls the rendering process for actors and scenes

Render window ● The vtkRenderWindow class creates a window for renderers to draw into

Interactors ● The vtkRenderWindowInteractor class provides platform-independent window interaction via the mouse and keyboard

一个读取.obj文件的代码：

 import vtk

 filename = "xxxxx.obj"
 reader = vtk.vtkOBJReader()
 reader.SetFileName(filename)
 reader.Update()

 mapper = vtk.vtkPolyDataMapper()
 mapper.SetInputConnection(reader.GetOutputPort())

 actor = vtk.vtkActor()
 actor.SetMapper(mapper)

 renderer = vtk.vtkRenderer()
 renderer.AddActor(actor)
 #renderer.GetActiveCamera().SetPosition() #设置视点位置
 #renderer.GetActiveCamera().SetViewUp(0, 1, 0)  #设置视点方向
 renderer.SetBackground(0.1, 0.1, 0.1)  #设置背景颜色

 renWin = vtk.vtkRenderWindow()
 renWin.SetSize(640, 480)     #设置窗口大小
 renWin.AddRenderer(renderer)

 iren = vtk.vtkRenderWindowInteractor()
 iren.SetRenderWindow(renWin)
 iren.Initialize()

 renWin.Render()
 iren.Start()

参考资料：

http://www.cb.uu.se/~aht/Vis2014/lecture2.pdf