[vtkusers] Generate 2D views (store them as images) from 3D models

[David Gobbi]

Do a search for "VTK pbuffer".  The OpenGL pbuffer extension provides
accelerated off-screen rendering.  I have never used it myself, but
there must be someone out there who has used it with VTK.

   David


On Mon, Jul 12, 2010 at 6:05 AM, Sebastien Jourdain
<sebastien.jourdain at kitware.com> wrote:
> Hi  Aitor,
>
> it's true that the rendering with OSMesa will be slower. But I do not
> know another solution, if you do not want a windows showing even for a
> short amount of time.
>
> Seb
>
> On Mon, Jul 12, 2010 at 4:45 AM, Aitor Aldomà <aldoma.aitor at gmail.com> wrote:
>> Hi again,
>>
>> thanks for your answer Seb. Offscreen rendering was the keywords I was
>> missing for a successfull search.
>> Anyway, I have been reading other posts about this topic and realized that
>> rendering with OSMesa will be slower as is not hardware accelerated, is that
>> true?. As I intend to use the Offscreen rendering for batch processing, I
>> really need the rendering to be fast... I am using Linux with Nvidia Card...
>> Any other ideas?
>>
>> Thanks
>>
>> On Wed, Jul 7, 2010 at 1:58 PM, Sebastien Jourdain
>> <sebastien.jourdain at kitware.com> wrote:
>>>
>>> Hi  Aitor,
>>>
>>> The only way to prevent the window from poping up, is to use the
>>> Offscreen option and compile vtk with OSMesa.
>>> Otherwise, even in Offscreen mode, a black window will popup and
>>> disappear.
>>>
>>> Seb
>>>
>>> On Wed, Jul 7, 2010 at 7:36 AM, Aitor Aldomà <aldoma.aitor at gmail.com>
>>> wrote:
>>> > Hi everybody,
>>> >
>>> > I want to generate 2D views of a 3D model and save them as jpeg image.
>>> > At
>>> > the moment, I am using vtkWindowToImageFilter to obtain the generated
>>> > view
>>> > from a RenderWindow. The problem is that I dont want to display the
>>> > window
>>> > on the screen, just wan the RenderWindow to render the view and store
>>> > the
>>> > result with vtkWindow without showing the window.
>>> >
>>> > This is part of the code i am using now, the problem is that the window
>>> > will
>>> > flash for a short time and then disapper. Is there a way to render the
>>> > view
>>> > without being displayed on the screen???
>>> >
>>> > renWin = vtk.vtkRenderWindow()
>>> > renWin.AddRenderer(ren)
>>> > ren.SetBackground(1, 1, 1)
>>> > renWin.SetSize(128,128)
>>> >
>>> > ren.Render()
>>> >
>>> > winToImageFilter = vtk.vtkWindowToImageFilter()
>>> > winToImageFilter.SetInput(renWin);
>>> >
>>> > renWin.Finalize()
>>> > winToImageFilter.Update()
>>> >
>>> > jw = vtk.vtkJPEGWriter();
>>> > jw.SetInput(winToImageFilter.GetOutput());
>>> >
>>> > jw.SetFileName(fileName + ".jpg");
>>> > jw.Write();
>>> >
>>> > Thanks in advance
>>> >
>>> >
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>>
>>
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