[Paraview] OSPRay Surface Opacity

[David E DeMarle]

A couple of observations:

1) for surface rendering with color mapped array, vtk's OSPRay interface we
does not yet respect transparency (either at the actor level or in the
alpha channel of the colormap). If you use a solid color for the entire
actor (PV GUI color choice is "Solid Color" instead of one of the arrays in
the data) then we do respect opacity.

2) we turn on aoTransparencyEnabled whenever there are volumes in the scene
https://gitlab.kitware.com/vtk/vtk/blob/master/Rendering/OSPRay/vtkOSPRayRendererNode.cxx#L870
If your scene doesn't have volumes in it, then you'll need to compile from
source and enable that generally (remove the if conditon).

Feel free to submit patches or bug reports to for either of those things to
help us remember to improve them.






David E DeMarle
Kitware, Inc.
Principal Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Thu, Sep 7, 2017 at 2:57 AM, Stefano Capra <steve.capra at gmail.com> wrote:

> Good morning,
> I am running ParaView 5.4.1-Qt5-OpenGL2-Windows-64bit and I was wondering
> if there is a way to activate the opacity rendering while using OSPRay
> ambient occlusion
>
> In the OSPRay website I have found this:
> "New SciVis renderer parameter aoTransparencyEnabled, controlling whether
> object transparency is respected when computing ambient occlusion (disabled
> by default, as it is considerable slower)"
>
> However I am not sure how to change that parameter in ParaView
>
> Thanks
> SC
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