[vtk-developers] [EXTERNAL] Re: VTK OpenGL2 Shaders

[Ken Martin]

I believe that is from the old OpenGL backend. - Ken

On Fri, Feb 5, 2016 at 4:09 PM, Bill Lorensen <bill.lorensen at gmail.com>
wrote:

> They look old to me. I am interested in the OpenGL2 rendwering backend.
>
> Perhaps an expert will comment.
>
>
> On Fri, Feb 5, 2016 at 3:16 PM, Gerrick Bivins
> <Gerrick.Bivins at halliburton.com> wrote:
> > So are these not valid anymore?
> >
> > http://www.vtk.org/Wiki/Shader_In_VTK
> >
> > http://www.vtk.org/Wiki/images/3/39/Vtk_shaders_tudelft_tut.pdf
> >
> >
> >
> > Or am I misunderstanding the question?
> >
> > Gerrick
> >
> >
> >
> > From: vtk-developers [mailto:vtk-developers-bounces at vtk.org] On Behalf
> Of
> > Ken Martin
> > Sent: Friday, February 05, 2016 12:21 PM
> > To: Aashish Chaudhary
> > Cc: VTK Developers; Steve Pieper
> > Subject: [EXTERNAL] Re: [vtk-developers] VTK OpenGL2 Shaders
> >
> >
> >
> > Here is some info from an old email on customizing the polydatamapper
> > shaders. The PointGaussianMapper also supports custom shaders and there
> is
> > an example of that in
> > Rendering/OpenGL2/Testing/Cxx/TestPointGaussianMapperOpacity.cxx
> >
> > Thanks
> >
> > Ken
> >
> >
> >
> > 2)      CUSTOM SHADERS - Added support for customizing the default
> > PolyDataMapper shaders. You can now modify or completely replace the
> default
> > VTK shadersusing methods such as
> >
> >
> >
> > AddShaderReplacement: replaces a strings in the current shader
> > SetVertexShaderCode: replaces the default shader template with your own
> >
> > AddObserver(vtkCommand::UpdateShaderEvent,...)
> >
> >
> >
> > These methods (and similar others) give you a great degree on control of
> the
> > VTK PolyData shaders. There are examples/tests in
> > Rendering/OpenGL2/Testing/Cxx/TestUserShader.cxx and TestUserShader2.cxx.
> > Through the UpdateShaderEvent you can modify the default VTK uniforms or
> > your own uniforms as desired. There is currently not a general purpose
> easy
> > API for binding your own data arrays to attributes but we may add one at
> > some point in the future. Currently VTK will send down the default
> > attributes for you to use in your shader (position, normal, tcoords,
> colors,
> > etc)
> >
> >
> >
> >
> >
> > On Fri, Feb 5, 2016 at 12:11 PM, Aashish Chaudhary
> > <aashish.chaudhary at kitware.com> wrote:
> >
> > Not to my knowledge. Although we talked about it at-least having an API
> so
> > that folks can replace the shader or ember new shader code to the
> existing
> > one. Also, having some common convention would be nice.
> >
> >
> >
> > Thanks,
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > On Fri, Feb 5, 2016 at 11:31 AM, Steve Pieper <pieper at isomics.com>
> wrote:
> >
> > Hi Bill -
> >
> >
> >
> > Great question - I'm looking forward to hear what folks have been doing
> in
> > this respect.
> >
> >
> >
> > For me, I have two classes I have been testing with Slicer - one that
> > manages 3D textures and one that implements shaders [1,2].  We worked on
> it
> > at project week [3] and I'm liking how it works.
> >
> >
> >
> > -Steve
> >
> >
> >
> > [1]
> >
> https://github.com/pieper/CommonGL/blob/master/ShadedActor/Logic/vtkOpenGLTextureImage.h
> >
> >
> >
> > [2]
> >
> https://github.com/pieper/CommonGL/blob/master/ShadedActor/Logic/vtkOpenGLShaderComputation.h
> >
> >
> >
> > [3]
> >
> http://www.na-mic.org/Wiki/index.php/2016_Winter_Project_Week/Projects/CommonGL
> >
> >
> >
> > On Fri, Feb 5, 2016 at 11:10 AM, Bill Lorensen <bill.lorensen at gmail.com>
> > wrote:
> >
> > Folks,
> >
> > Is there documentation on how to write glsl shaders for VTK?
> >
> > Bill
> > --
> > Unpaid intern in BillsBasement at noware dot com
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> >
> >
> > --
> >
> > | Aashish Chaudhary
> > | Technical Leader
> > | Kitware Inc.
> >
> > | http://www.kitware.com/company/team/chaudhary.html
> >
> >
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> >
> >
> >
> >
> > --
> >
> > Ken Martin PhD
> >
> > Chairman & CFO
> > Kitware Inc.
> > 28 Corporate Drive
> > Clifton Park NY 12065
> > 518 371 3971
> >
> >
> >
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>
> --
> Unpaid intern in BillsBasement at noware dot com
>



-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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