[vtk-developers] passing vertex attributes to custom shader (Ken Martin)

[Brad Hollister]

Thanks, Ken. I'm using the VTK Python bindings. It looks like 
vtkOpenGLHelper isn't wrapped.

Is there another way to set the uniforms besides of the method given 
in the C++ test program?

Regards,
Brad

> Date: Sat, 5 Mar 2016 08:05:40 -0500
>From: Ken Martin <ken.martin at kitware.com>
> To: Brad Hollister <behollis at sci.utah.edu>
> Cc: VTK Developers <vtk-developers at vtk.org>
> Subject: Re: [vtk-developers] passing vertex attributes to custom
> 	shader
> Message-ID:
> 	<CANXz0SY+P=YuTQFcWg+5=9pd9RiCxPNYQjrrMKERLPhm2ooFsg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 
> 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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