我对VTK很陌生。我尝试在python中使用VTK来编辑.stl
文件,使用vtkBoxWidget
。我正在读取.stl
文件,用vtkBoxWidget
在窗口交互器中使用鼠标/拖动来编辑它,最后我想在点击某个键时将新数据写入一个新的.stl
。在
下面是一个代码来演示这个问题:
#!/usr/bin/env python
import vtk
import sys
import os
filename = "file.stl"
# render the data
reader = vtk.vtkSTLReader()
reader.SetFileName(filename)
stlMapper = vtk.vtkPolyDataMapper()
stlMapper.SetInputConnection(reader.GetOutputPort())
# create an actor for our scene
stlActor = vtk.vtkActor()
stlActor.SetMapper(stlMapper)
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# The box widget observes the events invoked by the render window
# interactor. These events come from user interaction in the render
# window.
boxWidget = vtk.vtkBoxWidget()
boxWidget.SetInteractor(iren)
boxWidget.SetPlaceFactor(1.25)
# Add the actors to the renderer, set the background and window size.
ren.AddActor(stlActor)
ren.SetBackground(0.1, 0.2, 0.4)
renWin.SetSize(300, 300)
# As the box widget is interacted with, it produces a transformation
# matrix that is set on the actor.
t = vtk.vtkTransform()
def TransformActor(obj, event):
global t, stlActor
obj.GetTransform(t)
stlActor.SetUserTransform(t)
def onKeyPressEvent(self, renderer):
key = self.GetKeyCode()
if(key=='l'):
print stlActor.GetBounds()
if(os.path.isfile("done.stl")==1):
os.remove("done.stl")
print stlActor.GetMapper().GetInput().GetBounds()
stlPolyData = stlActor.GetMapper().GetInput()
writer = vtk.vtkSTLWriter()
writer.SetFileName("done.stl")
writer.AddInputDataObject(stlPolyData)
writer.Write()
# Place the interactor initially. The actor is used to place and scale
# the interactor. An observer is added to the box widget to watch for
# interaction events. This event is captured and used to set the
# transformation matrix of the actor.
boxWidget.SetProp3D(stlActor)
boxWidget.PlaceWidget()
boxWidget.AddObserver("InteractionEvent", TransformActor)
iren.AddObserver('KeyPressEvent', onKeyPressEvent)
iren.Initialize()
renWin.Render()
iren.Start()
问题是我不知道如何更新vtkPolyData
,也不知道如何将应用于vtkActor
的转换传递到vtkPolyData
。在上面的代码中,我用两个print函数中的.GetBounds()测试了这一点。最初对象有边界:
更新后,actor边界发生了更改,但我无法将所有这些属性传递给vtkPolyData。在
(-2.1331110248939638, 2.246371570191821, -1.5743578447908013, 2.5817210301577385, -2.1311284932847796, 2.0695034726591715)
(-2.0, 2.0, 0.0, 1.625, -1.5, 1.8125)
谢谢!在
我想我觉得:
这将把polyData转换成我在保存之前所需要的。在
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