[vtk-developers] vtkOpenGLPolyDataMapper blend mode

[Ken Martin]

I thought there might be but I do not see it. From an OpenGL perspective it
is pretty easy. We just change the

  glBlendFuncSeparate() and glBlendEquationSeparate() calls as they can do
what you want.

The risk we run is that some render passes and mappers rely on specific
blend functions to work. They would end up overriding what the user set or
failing which could be confusing. The place to do it would be to add the
ivar/methods into vtkProperty and then in vtkOpenGLActor::Render() use the
property and set the blend functions.

Thanks
Ken



On Thu, Mar 24, 2016 at 2:52 PM, Brad Hollister <behollis at sci.utah.edu>
wrote:

> While vtkSmartVolumeMapper allows the selection of blending mode via:
>
> SetBlendMode (int)
> SetBlendModeToComposite ()
> SetBlendModeToMaximumIntensity ()
> SetBlendModeToMinimumIntensity ()
> SetBlendModeToAdditive ()
>
> is there a similar way to enable a particular type of blending with
> vtkOpenGLPolyDataMapper?
>
> Regards,
> Brad
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Ken Martin PhD
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