Python VTK polydata not updating -
i'm trying use vtk plot points, interactively update locations given set of point locations.
i can interactively use polydata object plot points, not update when call self.polydata.update(). points update when call self.polydata.getcelldata().setscalars(somechararray)
is bug in vtk, or not updating point coordinates correctly?
i have included example script. if comment out self.polydata.getcelldata().setscalars(somechararray) in slidercallback, plot not update point's coordinates when use slider. update if leave line in.
thanks!
import numpy np import vtk vtk.qt4.qvtkrenderwindowinteractor import qvtkrenderwindowinteractor pyqt4 import qtgui import sys class viewerwithscrollbar(qtgui.qmainwindow): def __init__(self, parent=none): super(viewerwithscrollbar, self).__init__(parent) # define renderer , qt window ------------------------ self.frame = qtgui.qframe() self.hl = qtgui.qhboxlayout() self.vtkwidget = qvtkrenderwindowinteractor(self.frame) self.hl.addwidget(self.vtkwidget) self.ren = vtk.vtkrenderer() self.vtkwidget.getrenderwindow().addrenderer(self.ren) self.iren = self.vtkwidget.getrenderwindow().getinteractor() self.iren.setinteractorstyle(vtk.vtkinteractorstyletrackballcamera()) self.ren.resetcamera() self.frame.setlayout(self.hl) self.setcentralwidget(self.frame) # point coordinate data --------------------------------- self.coorddata = {} self.coorddata[0] = np.array([[0,0,0], [1,0,0], [1,1,0]]) self.coorddata[1] = self.coorddata[0] + np.array([[0.2, 0.1, -0.05], [0,0,0], [0,0,0]]) self.coorddata[2] = self.coorddata[1] + np.array([[0.2, 0.1, -0.05], [0,0,0], [0,0,0]]) # define slider bar , add window --------------- slider = qtgui.qslider() slider.setaccessiblename('time index') slider.setrange(0, len(self.coorddata)-1) slider.valuechanged.connect(self.slidercallback) self.hl.addwidget(slider) # create polydata object ----------------------------- points = vtk.vtkpoints() points.setnumberofpoints(len(self.coorddata[0])) self.polydata = vtk.vtkpolydata() in range(len(self.coorddata[0])): points.setpoint(i, self.coorddata[0][i]) self.polydata.setpoints(points) ptsfilter = vtk.vtkvertexglyphfilter() ptsfilter.setinputconnection(self.polydata.getproducerport()) ptsmapper = vtk.vtkpolydatamapper() ptsmapper.setinputconnection(ptsfilter.getoutputport()) ptsactor = vtk.vtkactor() ptsactor.setmapper(ptsmapper) ptsactor.getproperty().setpointsize(10) self.ren.addactor(ptsactor) self.show() self.iren.initialize() def slidercallback(self): index = self.sender().value() # index slider bar on somechararray = vtk.vtkunsignedchararray() points = self.polydata.getpoints() in range(len(self.coorddata[index])): points.setpoint(i, self.coorddata[index][i]) self.polydata.getcelldata().setscalars(somechararray) # reason polydata won't update unless called. # self.polydata.update() self.iren.render() return if __name__ == "__main__": app = qtgui.qapplication(sys.argv) window = viewerwithscrollbar() sys.exit(app.exec_())
with lib's advice, modified code. calling self.polydata.modified() in slidercallback method fixed problem
import numpy np import vtk vtk.qt4.qvtkrenderwindowinteractor import qvtkrenderwindowinteractor pyqt4 import qtgui import sys class viewerwithscrollbar(qtgui.qmainwindow): def __init__(self, parent=none): super(viewerwithscrollbar, self).__init__(parent) # define renderer , qt window ------------------------ self.frame = qtgui.qframe() self.hl = qtgui.qhboxlayout() self.vtkwidget = qvtkrenderwindowinteractor(self.frame) self.hl.addwidget(self.vtkwidget) self.ren = vtk.vtkrenderer() self.vtkwidget.getrenderwindow().addrenderer(self.ren) self.iren = self.vtkwidget.getrenderwindow().getinteractor() self.iren.setinteractorstyle(vtk.vtkinteractorstyletrackballcamera()) self.ren.resetcamera() self.frame.setlayout(self.hl) self.setcentralwidget(self.frame) # point coordinate data --------------------------------- self.coorddata = {} self.coorddata[0] = np.array([[0,0,0], [1,0,0], [1,1,0]]) self.coorddata[1] = self.coorddata[0] + np.array([[0.2, 0.1, -0.05], [0,0,0], [0,0,0]]) self.coorddata[2] = self.coorddata[1] + np.array([[0.2, 0.1, -0.05], [0,0,0], [0,0,0]]) # define slider bar , add window --------------- slider = qtgui.qslider() slider.setaccessiblename('time index') slider.setrange(0, len(self.coorddata)-1) slider.valuechanged.connect(self.slidercallback) self.hl.addwidget(slider) # create polydata object ----------------------------- points = vtk.vtkpoints() points.setnumberofpoints(len(self.coorddata[0])) self.polydata = vtk.vtkpolydata() in range(len(self.coorddata[0])): points.setpoint(i, self.coorddata[0][i]) self.polydata.setpoints(points) ptsfilter = vtk.vtkvertexglyphfilter() ptsfilter.setinputdata(self.polydata) ptsmapper = vtk.vtkpolydatamapper() ptsmapper.setinputconnection(ptsfilter.getoutputport()) ptsactor = vtk.vtkactor() ptsactor.setmapper(ptsmapper) ptsactor.getproperty().setpointsize(10) self.ren.addactor(ptsactor) self.show() self.iren.initialize() def slidercallback(self): index = self.sender().value() # index slider bar on points = self.polydata.getpoints() in range(len(self.coorddata[index])): points.setpoint(i, self.coorddata[index][i]) self.polydata.modified() self.iren.render() return if __name__ == "__main__": app = qtgui.qapplication(sys.argv) window = viewerwithscrollbar() sys.exit(app.exec_()) 
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