[vtkusers] vtkOpenGLPolyDataMapper, custom shaders and line width property

[Ken Martin]

Wide lines on some systems require a geometry shader. Maybe that is causing
the issue. VTK uses some shader name replacements to handle that there may,
or may not be a geometry shader in the mix which is how it handles wide
lines. Maybe take a look at the default shaders (vert,frag,geom) for both
the normal and wide line case in a running VTK and work from there.

On Wed, Feb 21, 2018 at 11:08 AM, Neher, Peter <p.neher at dkfz-heidelberg.de>
wrote:

> Hi everyone,
>
>
> I am trying to render a polydata in a QVTKOpenGLWidget with thick lines
> (actor property line width) in conjunction with my own shader code. Since
> we switched from QVTKWidget to QVTKOpenGLWidget this results in black lines
> (no color and/or lighting). Everything works fine if the line with is 1.0.
> For line width > 1.0, the shader seems to do nothing.
>
>
> Shader code is attached, as well as two images of depicting the issue.
>
>
> Any help is much appreciated!
>
>
> Peter
>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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