[vtkusers] Volume rendering update

[Aashish Chaudhary]

Hi All,

We have made several improvements to the volume rendering engine in the
last few months and will be pushing more changes to VTK in the next two
weeks. Below is a quick summary of our work. Your suggestions and
contributions are welcome and encouraged. We are also planning a blog by
the end of this month with performance numbers to cover some detail on the
work done as part of the VTK rendering improvements.

Most Recent Updates:

   -

   Added support for multiple component (2, 3, 4) independent components
   and 2 dependent components
   -

   Fixed cropping issues and fixed related tests
   -

   Fixed a bug which result in a crash when context changes


Other Updates

   -

   Fixed various mac issues
   -

   Improved interactive performance for large volumes
   -

   Fixed extents not getting updated issues in presence of other filters
   -

   Fixed window color adjustments issues.
   -

   Fixed issue with noise textures
   -

   Added volume rendering benchmarking tests
   -

   Added new volume tests. Now testing various features where were not
   tested before (52 volume tests now)
   -

   Fixed resources not releasing issues
   -

   vtkVolume now uses vtkTextureObject
   -

   Using the shader cache for volume rendering
   -

   99 % tests are passing on Mac/Linux and Windows.


Work in Progress

   -

   Fixing 2 and 3 independent component tests on a particular dashboard
   that uses Mesa GL
   -

   Looking into some very specific rendering performance issues
   specifically on Mac
   - New blog post on volume rendering


-- 



*| 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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