[vtkusers] Shaders for VTK

[Sankhesh Jhaveri]

Hi,

VTK generates shaders at runtime and there are hooks in place that allow
you to modify the generated shader code.

Take a look a https://www.vtk.org/Wiki/Shaders_In_VTK for some information.
There are some tests that exercise this functionality

   - TestUserShader
   <https://gitlab.kitware.com/vtk/vtk/blob/2fe1f778ecdab89cab7b3c5b1d8c23e7ddc5015a/Rendering/OpenGL2/Testing/Cxx/TestUserShader.cxx>
   - TestUserShader2
   <https://gitlab.kitware.com/vtk/vtk/blob/2fe1f778ecdab89cab7b3c5b1d8c23e7ddc5015a/Rendering/OpenGL2/Testing/Cxx/TestUserShader2.cxx>
   - TestGPURayCastUserShader
   <https://gitlab.kitware.com/vtk/vtk/blob/2fe1f778ecdab89cab7b3c5b1d8c23e7ddc5015a/Rendering/Volume/Testing/Cxx/TestGPURayCastUserShader.cxx>
   - TestGPURayCastUserShader2
   <https://gitlab.kitware.com/vtk/vtk/blob/2fe1f778ecdab89cab7b3c5b1d8c23e7ddc5015a/Rendering/Volume/Testing/Cxx/TestGPURayCastUserShader2.cxx>

Hope this helps.

Best,
Sankhesh
​

On Tue, Dec 5, 2017 at 1:27 PM PhD Andrea Vitali <andrea.vitali1 at unibg.it>
wrote:

> Dear All,
>
> Which is the best way to use shaders in VTK?
>
> I need to add several vertex attributes to the existent ones. I'm using
> vtkOpenGLPolyDataMapper as the starting point, but I'm not able to
> understand how to use shaders as usually done by classic OpenGL.
>
> Are there any examples of tutorials about it?
>
> Thank you in advance,
>
> Andrea
>
>
>
> --
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-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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