[vtk-developers] vtkOpenGLPolyDataMapper::RenderPiece

[Mark Beall]

Hi Lisa,
This is important with respect to our little quest to get good
rendering speed with a large number of actors. In our test all
these calls to MakeCurrent take 50% longer than all the calls
to glCallList, so we would like to eliminate them. 

mark

On 5/29/01 9:50 AM Lisa S. Avila (lisa.avila at kitware.com) wrote:

>Hi Bob,
>
>MakeCurrent must be called any time the window may have become uncurrent 
>(for want of a better term!) This can happen unexpectedly - and I actually 
>spent many hours on several problems tracking it down to an uncurrent window.
>
>During the rendering process a prop may update, causing its mapper to 
>update. The mapper may get data that is pulled from another window - 
>causing that other window to become current. Or, a start / end method on 
>some filter may have a render call into another window (as is done with the 
>pipeline viewer)
>
>If you think this is a serious issue, we can start keeping "global" state 
>information in the render window. You'll still make the 120,000 calls, but 
>they will simply check the current state and return if no MakeCurrent is 
>actually necessary.
>
>Lisa
>
>
>At 02:55 PM 5/25/2001, obara wrote:
>>Hi Folks,
>>
>>Doesn't vtkOpenGlRenderWindow::MakeCurrent() only have to be called once
>>when rendering the window?  We were rendering a simple scene 120x's and
>>found this function being called 120,000 because
>>vtkOpenGLPolyDataMapper::RenderPiece() calls
>>vtkOpenGlRenderWindow::MakeCurrent().
>>
>>At least I didn't ask anything about indentation or where to put braces.
>>
>>Thanks in advance,
>>
>>Bob
>>
>>Robert M. O'Bara
>>Senior Software Engineer
>>Simmetrix Inc.
>>1223 Peoples Ave.
>>Troy, NY 12180
>>
>>Lab: (518) 276-2867
>>Main Office: (518) 276-2729
>>
>>
>>
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>
>
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