[vtkusers] Mesa 5.0.2 not drawing

[straw dog]

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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