Dear Team; Via debug I found the following strange piece of code in vtkKWEOpenGLGPUVolumeRayCastMapper.cxx:
// It does not work on Apple OS X Snow Leopard with nVidia. // There is a bug in the OpenGL driver with an error in the // Cg compiler about an infinite loop. #ifdef __APPLE__ this->LoadExtensionsSucceeded=0; return; #endif This belongs to the function void """vtkKWEOpenGLGPUVolumeRayCastMapper::LoadExtensions(vtkRenderWindow *window)""", which, in turn is called by """void vtkKWEOpenGLGPUVolumeRayCastMapper::PreRender(...). What I conclude is: by setting """this->LoadExtensionsSucceeded=0""" will always lead """LoadExtensions""" to fail on Mac OS X apps that rely on vtkKWEOpenGLGPUVolumeRayCastMapper. Such fail will not only occurs on Snow Leopard but also in Leopard. Please, can someone point me out if my findings makes sense? Best Regards Fauze On Sat, Feb 6, 2010 at 2:03 AM, Fauze Polpeta <[email protected]>wrote: > Dear Edge Team; > > I'm trying to build a simple volume rendering application on top of Cocoa > in order to evaluate the GPU Ray Casting support, but when I run the > application I've got the following error: > > --- > > ERROR: In > /Users/fauze/Development/toolkits/vtkedge/source/VolumeRendering/vtkKWEOpenGLGPUVolumeRayCastMapper.cxx, > line 4139 > vtkKWEOpenGLGPUVolumeRayCastMapper (0x768d600): Rendering failed because > the following OpenGL extensions are required but not supported: > > Program received signal: “EXC_BAD_ACCESS”. > > --- > > I'm sure the program is ok since it works with the ordinary mappers of VTK > and also if I let VTKEdge to load itself the mapper (vtkKWEVolumeMapper). > The error occurs when I opt by vtkKWEGPUVolumeRayCastMapper which leads to > the deployment of the vtkKWEOpenGLGPUVolumeRayCastMapper. The point is that > the "following OpenGL extensions" are not listed and thus I can't figure out > what is happening. > > Please, can someone give me so help? Some framework I'm missing? I'm > running on top of Mac Pro Core i7 - NVidia GTX 285 - Snow Leopard / Leopard. > > Thanks in advance > > Fauze > > > Ps.: The VTKEdgeVolumeRenderingCxxTests have printed out: Required > extensions not supported. > > > > > >
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