[vtkusers] Actors Vs. Memory

[Will Schroeder]

It's been added.
Will

At 01:41 PM 7/23/00 -0400, Mark Beall wrote:

>Regarding (1), there was (is?) a problem where vtk would allocate
>a bunch of memory that often wasn't used for every vtkPolyData that
>was constructed. This actually amounted to something on the
>order of 10k per vtkPolyData. I would guess that this is what
>you're seeing.
>We gave a fix for this to Kitware a couple of months ago, I
>think Will said it's been added into the nightly version (it was
>after 3.1 was release), but I haven't checked to know for sure.
>
>mark
>
> >1) Could someone tell me why the first code fragment below takes 
> dramatically
> >less memory than the second? It doesn't seem like it can just be attributed
> >to the extra mappers and actors.
> >
> >2) Where should I look for information on how to render large
> >datasets, particularly those where at any given time most of the data
> >does not need to be displayed?
> >                               Thanks,
> >                                               J. Toman
> >
> >-----------------------------------------------
> >ren = vtkRenderer()
> >
> >append = vtkAppendPolyData()
> >
> >for k in range(0, 20):
> >   for i in range(0,20):
> >      for j in range(0, 20):
> >         cube = vtkCubeSource()
> >         cube.SetCenter(2*i, 2*j, 2*k)
> >         append.AddInput(cube.GetOutput())
> >
> >polymap = vtkPolyDataMapper()
> >polymap.SetInput(append.GetOutput())
> >actor = vtkLODActor()
> >actor.SetMapper(polymap)
> >ren.AddActor(actor)
> >
> >
> >---------------------------------------------------
> >ren = vtkRenderer()
> >
> >for k in range(0, 20):
> >   for i in range(0,20):
> >      for j in range(0, 20):
> >         cube = vtkCubeSource()
> >         cube.SetCenter(2*i, 2*j, 2*k)
> >       polymap = vtkPolyDataMapper()
> >       polymap.SetInput(cube.GetOutput())
> >       actor = vtkLODActor()
> >       actor.SetMapper(polymap)
> >       ren.AddActor(actor)
>
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