[vtkusers] vtkOpenGLVolumeTextureMapper3D error

[Francois Bertel]

Fixed:

http://vtk.org/gitweb?p=VTK.git;a=commit;h=ee8ba219cf4989f27cf62fd45ebffcc93a71699a


Warning: it required a change in the vtkVolumeTextureMapper3D API with
a different signature for IsRenderSupported().

On Fri, May 14, 2010 at 5:28 PM, Francois Bertel
<francois.bertel at kitware.com> wrote:
> I'll look into that, thanks.
>
> On Fri, May 14, 2010 at 4:45 PM, Isaac Abbott <isaac.abbott at gmail.com> wrote:
>> Dear developer,
>>
>> I have been using vtkOpenGLVolumeTextureMapper3D in many programs for some
>> time, but when I updated my VTK version to today's git clone my renderer
>> began to crash.
>>
>> I debugged the error all the way to
>> vtkOpenGLVolumeTextureMapper3D::Initialize() with this code at the beginning
>> of the method:
>>
>> ******************************************************************************************
>> {
>> this->Initialized = 1;
>> vtkOpenGLExtensionManager * extensions = vtkOpenGLExtensionManager::New();
>> extensions->SetRenderWindow(NULL); // set render window to the current one.
>>
>> int supports_texture3D=extensions->ExtensionSupported( "GL_VERSION_1_2" );
>> ...
>> }
>> ******************************************************************************************
>>
>> but found this block within vtkOpenGLExtensionManager::ExtensionSupported:
>>
>> ******************************************************************************************
>> int vtkOpenGLExtensionManager::ExtensionSupported(const char *name)
>> {
>> ...
>> ...
>> // Woraround for a nVidia bug in indirect/remote rendering mode (ssh -X)
>>  // The version returns is not the one actually supported.
>>  // For example, the version returns is greater or equal to 2.1
>>  // but where PBO (which are core in 2.1) are not actually supported.
>>  // In this case, force the version to be 1.1 (minimal). Anything above
>>  // will be requested only through extensions.
>>  // See ParaView bug
>>  if(result && !this->RenderWindow->IsDirect())
>>    {
>>    if (result && strncmp(name, "GL_VERSION_",11) == 0)
>>      {
>>      // whatever is the OpenGL version, return false.
>>      // (nobody asks for GL_VERSION_1_1)
>>      result=0;
>>      }
>>    }
>>
>> ....
>> ....
>> }
>> ******************************************************************************************
>>
>> It crashes because we try to use a method on a NULL pointer
>> (this->RenderWindow) in the first IF statement.
>> I temporarily fixed the crashing problem by adding && this->RenderWindow to
>> the IF statement.
>>
>> Isaac
>>
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>
>
>
> --
> François Bertel, PhD  | Kitware Inc. Suite 204
> 1 (518) 371 3971 x113 | 28 Corporate Drive
>                      | Clifton Park NY 12065, USA
>



-- 
François Bertel, PhD  | Kitware Inc. Suite 204
1 (518) 371 3971 x113 | 28 Corporate Drive
                      | Clifton Park NY 12065, USA