[vtkusers] How to visualize thousands of actors with good performance

[Darshan Pai]

On Thu, Sep 30, 2010 at 4:14 PM, Darshan Pai <darshanpai at gmail.com> wrote:

> Had a decent performance with 64-bit python on vtk 5.6.1 . maybe a 2 second
> delay . a little jerky . Did not try with 4.4 yet .
>
>
> On Thu, Sep 30, 2010 at 3:35 PM, Pascal Augustin <
> pascal at rogue-research.com> wrote:
>
>> >
>> > Good idea. Unfortunately I am not familiar with tcl as we use vtk in c++
>> only. If you could share the results with me/us, that would be great.
>> >
>>
>> Hi,
>>
>>  As you've previously  mentioned, rendering 10000s of actors was much
>> faster in vtk 4.4. Using the following Python script, I've obtained these
>> results:
>>
>> VTK 4.4.2: Rotating 10000 spheres takes about 30 seconds.
>>
>> VTK 5.0.4: Rotating 10000 spheres takes about 2 minutes. What is
>> interesting is that for the first few seconds, it is actually faster than in
>> 4.4.2. Then, it suddenly stalls for about 20 seconds. Afterwards, it
>> continues rotating slowly but at a regular pace.
>>
>>
>>
>> #------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>> #!/usr/bin/env python
>> #
>>
>> import vtk
>>
>> ren = vtk.vtkRenderer()
>> append = vtk.vtkAppendPolyData()
>> for j in range(1, 100):
>>        for i in range(1, 100):
>>                sphere = vtk.vtkSphereSource()
>>                sphere.SetRadius(1.0)
>>                sphere.SetCenter(2 * i, 2 * j, 0)
>>                sphere.SetThetaResolution(16)
>>                sphere.SetPhiResolution(16)
>>                sphereMapper = vtk.vtkPolyDataMapper()
>>                sphereMapper.SetInput(sphere.GetOutput())
>>                sphereActor = vtk.vtkActor()
>>                sphereActor.SetMapper(sphereMapper)
>>                ren.AddActor(sphereActor)
>>
>> renWin = vtk.vtkRenderWindow()
>> renWin.AddRenderer(ren)
>> renWin.SetSize(500, 500)
>>
>> for i in range(0, 15):
>>        renWin.Render()
>>        ren.GetActiveCamera().Roll(24)
>>
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>
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