[vtkusers] Volume Rendering Update

[Aashish Chaudhary]

On Mon, Jun 1, 2015 at 10:47 AM, Mike Guttman <mguttman at yahoo.com> wrote:

> Guess I wasn't tracking the permutations carefully.  When backend is set
> to OpenGL2, there's an error when I turn on
> Module_vtkRenderingVolumeOpenGL.  It seems okay with
> Module_vtkRenderingExternal.
>

yes, you cannot use  Module_vtkRenderingVolumeOpenGL with OpenGL2 as it was
written for previous implementation.

>
> I use vtkOpenGLVolumeTextureMapper3D in my application.  Perhaps this is
> not available with OpenGL2 backend?
>

Yes, it is not. Since most of the platforms now support all of the features
needed for Ray Casting (for OpenGL 2 version), we don't need this mapper
anymore.


> I believe this is not included with Module_vtkRenderingVolumeOpenGLNew.
>

Right. In current master, we remvoed that module as it was there to serve
until we had a reasonable OpenGL2 mapper which we do now.

Thanks,




>
> After your comment, I tried it again after pulling from the repo just now.
>
> Thanks,
> Mike
>
>
>
>
>
>   On Monday, June 1, 2015 10:05 AM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
>
> On Sat, May 30, 2015 at 4:59 PM, Mike Guttman <mguttman at yahoo.com> wrote:
>
> Hello Aashish,
>
> It seems you cannot enable ExternalVTKWidget with OpenGL2.  Any idea when
> this combination will be supported?
>
>
> What SHA of git you are using?
>
>
> Thanks,
> Mike
>
> *From: *Aashish Chaudhary <aashish.chaudhary at kitware.com>
> *To: *vtkusers <vtkusers at vtk.org>, VTK Developers <vtk-developers at vtk.org>
> *Date: *May 29, 2015 at 5:31:34 PM EDT
> *Subject: **[vtkusers] Volume Rendering Update*
>
>
> Folks,
>
> We made some recent improvements to VTK volume rendering including fixes
> to related components. Here is a list of those changes:
>
> 1) Now new GPU Volume Mapper respect Interpolation Type (Linear or
> Nearest). Default is Nearest as in the last GPU mapper.
>
> 2) Shading is now twice as fast as before. There will be another branch to
> make it even faster.
>
> 3) Fixed lighting bug (number of lights kept on increasing with change in
> volume property)
>
> 4) Saving and Restoring GL state properly for textures
>
> 5) Bias and Scale are now performed in Shader.
>
> 6) We changed some GL texture format information to support OpenGL 3
> context
>
> 7) Fixed extensions were not reported correctly on GL2 context
>
> 8) Fixed few failing tests specifically on Mesa
>
> 9) Removed VolumeOpenGLNew module as it was not as usable with OpenGL2
> getting ready for primetime
>
> 10)  Added convenience API to SmartVolume Mapper
>
> 11) Cleaned up logic for dealing with context changes in Volume Mapper
>
>
> Please let us know if you have any questions.
>
> Thanks,
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
>
>


-- 



*| 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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