[vtkusers] Mesa 5.0.2 not drawing

[Berk Geveci]

Unfortunately, it is not enough to replace renderers and render windows.
You also have to replace all mappers and actors (cameras, lights,
properties and textures too, if you are creating them yourself) with
mesa equivalents. This essentially requires duplicating your whole
rendering pipeline (if you want to have both hardware accelerated
rendering and mangled mesa rendering). If you want to use mesa classes
only, make the following calls in the beginning of your program:
      vtkGraphicsFactory::SetUseMesaClasses(1);
      vtkImagingFactory::SetUseMesaClasses(1);

Then, you can create all rendering objects as usual and the factories
will handle creating the mesa classes.

-Berk

On Mon, 2003-12-08 at 10:49, straw dog wrote:
> Hello,
> I've been trying to get vtk4.2.2 to work with Mesa in order to enable 
> off-screen rendering.  I've found that code that will work just fine with 
> OpenGL draws an empty screen under Mesa.  Has anyone experienced this 
> problem.  To test the issue, i used the cylinder example from the 
> examples/rendering directory and simply replaced the renderwindow and 
> renderer with Mesa objects, see below.
> 
> The original Cylinder code compiles and works perfectly.  With Mesa, all i 
> get is an empty RenderWindow.
> 
> Has anyone seen this before?  Am i botching something in my simple test code 
> below?  If not, can anyone suggest how to go about diagnosing the problem - 
> i really can't see even how to identify what the problem is.
> 
> Some other details
> Mesa version is 5.0.2, compiled as mangled-mesa.  The Mesa examples work 
> just fine, and i have
> tried both statically and dynamically linked configurations with the above 
> problem.
> 
> System is linux, redhat8.  Kernel 2.4.20.
> Nvidia Video card, so system Open GL libs are replaced with NVidias - but 
> should not be the source of the problem (i don't think) as the examples that 
> come with Mesa work fine.
> vtk version is 4.2.2
> 
> Thanks much
> Rupert Brooks
> McGill Centre for Intelligent Machines
> 
> Simple code example with Cylinder.cxx from vtk distribution
> 
> diff vtk/Examples/Rendering/Cxx/Cylinder.cxx 
> /home/rain/igns/tools/VTK/src/Examples/Rendering/Cxx/Cylinder.cxx
> 27,28d26
> < #include "vtkMesaRenderer.h"
> < #include "vtkXMesaRenderWindow.h"
> 61,62c59,60
> <   vtkMesaRenderer *ren1 = vtkMesaRenderer::New();
> <   vtkMesaRenderWindow *renWin = vtkXMesaRenderWindow::New();
> ---
> >   vtkRenderer *ren1 = vtkRenderer::New();
> >   vtkRenderWindow *renWin = vtkRenderWindow::New();
> 
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-- 
Berk Geveci <berklist at nycap.rr.com>