[vtkusers] Volume Rendering and zbuffer

[Aashish Chaudhary]

That is because we make a call to clear the depth buffer bit  that is:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT). I have to think all of
the use-cases but I think we don't need to clear the depth buffer. We can
push a simple fix for it on the master branch.

- Aashish




On Tue, Oct 4, 2016 at 12:12 PM stevep <steve.petruzza at gmail.com> wrote:

> Hi all,
>
> I used the vtkPolyDataMapper to render a surface and then with the
> vtkRenderWindow I can get correctly the ZBuffer using GetZbufferData and
> the
> RGB data via vtkWindowToImageFilter.
>
> When I use, starting from the same vtkImageData, a volume rendering like
> the
> SmartVolumeMapper (as in the following):
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/SmartVolumeMapper
>
> The RGB data are correct but the ZBuffer contains all values == 1 (checked
> dumping the float array to disk).
>
> I get the same result changing blend mode and using a
> vtkFixedPointVolumeRayCastMapper.
>
> What am I missing?
>
> Thank you
>
>
>
>
>
> --
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