[vtkusers] Reusing of vtkOpenGLGPUVolumeRayCastMapper...

[Francois Bertel]

Hello,

Please post a minimal example to reproduce the problem.

Regards.

On Wed, Jun 16, 2010 at 6:01 AM, AGPX <agpxnet at yahoo.it> wrote:
> Ok,
>
> it not the assert that fails. The variable Context is invalid, it still
> point to the old destroyed object. This happen because we never change the
> Context of the class vtkShaderProgram2 to the new render window. That is the
> code:
>
> void vtkOpenGLGPUVolumeRayCastMapper::BuildProgram(vtkRenderWindow *w,
>                                                    int parallelProjection,
>                                                    int raycastMethod,
>                                                    int shadeMethod,
>                                                    int componentMethod)
> {
>
>   assert("pre: valid_raycastMethod" &&
>          raycastMethod>= vtkOpenGLGPUVolumeRayCastMapperMethodMIP
>          && raycastMethod<=vtkOpenGLGPUVolumeRayCastMapperMethodAdditive);
>
>   if(this->Program==0)
>     {
>     this->Program=vtkShaderProgram2::New();
>     this->Program->SetContext(static_cast<vtkOpenGLRenderWindow *>(w));
>     }
> ...
> }
>
> The Program variable isn't 0 and so the new context will never be setup. How
> I can solve this?
>
> ________________________________
> Da: AGPX <agpxnet at yahoo.it>
> A: vtk vtk <vtkusers at vtk.org>
> Inviato: Mer 16 giugno 2010, 10:40:35
> Oggetto: [vtkusers] Reusing of vtkOpenGLGPUVolumeRayCastMapper...
>
> Hello,
>
> I have a vtkOpenGLGPUVolumeRayCastMapper that I have previously used with
> another actor, renderer and render window. I wish to reuse it (creating a
> new actor, renderer and renderwindow), but I obtain an assert error:
>
> //
> ----------------------------------------------------------------------------
> // Description:
> // Use the shader program.
> // It saves the current shader program or fixed-pipeline in use.
> // It also set the uniform variables.
> void vtkShaderProgram2::Use()
> {
>   assert("pre: context_is_set" && this->Context!=0);
>   assert("pre: current_context_matches" && this->Context->IsCurrent());
> <---------------- Fail here!
>   this->Build();
>
> ....
>
> Look like that the context isn't current. There's a way to "reset" the
> mapper internal state? Note that the volume data input is the same, so I
> wish to reuse the mapper in order to avoid the very slow initialization
> (especially the gradients computation). Any hints?
>
> Thanks in advance.
>
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>
>



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