[Paraview] Volume rendering on OS X with Nvidia graphics card

[Aashish Chaudhary]

Hi Steven,

This is odd since the OpenGL2 mapper should have detected FBO support. I
will have a look at it.

- aashish

On Mon, Jun 29, 2015 at 6:06 PM, Hahn, Steven E. <hahnse at ornl.gov> wrote:

>  I am observing some odd results with volume rendering using ParaView
> 4.3.1 and ParaView master on OS X machines with NVIDIA graphics cards
> including a Geforce 650m in a macbook pro and a Quadro K5000 in a mac pro.
> On the mac pro, changing between the NVIDIA web driver and OS X default
> driver has no effect.
>
>  1) After loading a vtkImageData file and selecting the volume
> representation and the GPU based volume rendering mode, the image
> disappears. The other volume rendering modes show the image correctly. I
> also tried building ParaView master with the OpenGL2 rendering backend and
> in that case the GPU based volume rendering mode displays only some of the
> surfaces (2-4, the exact number depends on the camera position) and not the
> entire volume.
>
>  2) I also tried loading a small vtkStructuredGrid (attached) into
> ParaView master built with the OpenGL2 rendering backend and get the
> warning below.  There are substantial artifacts that are not present when
> the OpenGL rendering backend is used. These artifacts don’t appear when I
> load the same file in ParaView 4.3.1 or ParaView master build with the
> OpenGL rendering backend.
>
>   Warning: In
> ../VTK/Rendering/VolumeOpenGL2/vtkOpenGLProjectedTetrahedraMapper.cxx, line
> 151
>
> vtkOpenGLProjectedTetrahedraMapper (0x7fdc49d3a140): Missing FBO support.
> The algorithm may produce visual artifacts.
>
>
>  I tried running glxinfo and under OpenGL extensions it does
> list GL_ARB_framebuffer_object, GL_ARB_draw_buffers and
> GL_ARB_texture_float. VTK, however, doesn’t appear to be detecting this.
>
>
>  Sincerely,
>
> Steven Hahn
>
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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