[vtkusers] Rendering a scene in which actors move

[KS Jothybasu]

Have a look at http://www.cmake.org/Wiki/VTK/Examples/Python/Animation

Jothy

On Thu, Mar 11, 2010 at 5:05 AM, Gib Bogle <g.bogle at auckland.ac.nz> wrote:

> I wish to repeatedly render a scene with many actors (cones for now) that
> may change their positions as time progresses (i.e. I am creating a movie).
>  I can render the scene OK, but I see that the way I'm doing it is just
> adding actors each time step, whereas I want to redraw all the actors each
> time (or possibly, if I get clever, only those that have moved).  This what
> I'm doing in Python:
>
>    def QVTKRenderWidgetCones(self,page_VTK):
>        """A simple example that uses the QVTKRenderWindowInteractor
> class."""
>        if self.first_VTK:
>            self.first_VTK = False
>            layout = QtGui.QVBoxLayout(page_VTK)
>
>            # create the widget
>            self.VTKscene = QVTKRenderWindowInteractor(page_VTK)
>            self.VTKscene.Initialize()
>            self.VTKscene.Start()
>            renWin = self.VTKscene.GetRenderWindow()
>
>            layout.addWidget(self.VTKscene)
>            self.ren = vtk.vtkRenderer()
>            renWin.AddRenderer(self.ren)
>
>            cone = vtk.vtkConeSource()
>            cone.SetResolution(8)
>            self.coneMapper = vtk.vtkPolyDataMapper()
>            self.coneMapper.SetInput(cone.GetOutput())
>
> #        self.ren.Clear()
> #        for actor in self.ren.GetActors():
> #            self.ren.RemoveActor(actor)
>
>        print self.ren.GetActors()
>
>        n = self.ncells
>        coneActor = [0]*n
>        for i in range(0,n):
>            coneActor[i] = vtk.vtkActor()
>            coneActor[i].SetMapper(self.coneMapper)
>            self.ren.AddActor(coneActor[i])
>            cp = self.cellpos[i]
>            x = int(cp[2])
>            y = int(cp[3])
>            z = int(cp[4])
>            coneActor[i].SetPosition(x, y, z)
>
>        # show the widget
>        self.VTKscene.show()
>        self.VTKscene.Render()
>
> I tried to use ren.Clear(), but that obviously clears everything, and I
> discovered that a collection is not a list and therefore my attempt to use
> ren.RemoveActor() failed.  What is the right (i.e. fast) way to do this?
>
> Thanks
> Gib
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