[vtk-developers] passing vertex attributes to custom shader

[Ken Martin]

Currently you can pass uniforms (see
https://gitlab.kitware.com/vtk/vtk/blob/v7.0.0.rc2/Rendering/OpenGL2/Testing/Cxx/TestUserShader2.cxx
for an example). You currently cannot pass your own attributes without
subclassing, only work with the default ones that are passed
(position/scalars/normals/tcoords)

Thanks
Ken

On Fri, Mar 4, 2016 at 7:47 PM, Brad Hollister <behollis at sci.utah.edu>
wrote:

> Hi,
>
> I've been using vtkOpenGLPolyDataMapper() to set custom vertex / fragment
> shaders. I'd also like to provide user-defined vertex attributes accessible
> in the shader code. I assumed from the documentation that
> MapDataArrayToVertexAttributes() is the proper way to do this.
>
> However, I get the ERROR: vtkOpenGLPolyDataMapper (0x2872160): Not
> implemented at this level...
>
> There doesn't appear to be a derived class of vtkOpenGLPolyDataMapper
> available for my needs (which is that I'm specifying polygons via a
> vtkPolyData object).
>
> Is it possible to pass vertex attributes and custom uniforms using
> vtkOpenGLPolyDataMapper? Is there a different way from the one I've been
> trying that makes this possible?
>
> Regards,
> Brad
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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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