[vtkusers] Shadow support on volume rendering

[Bill Lorensen]

This would be a great example.  Would it be hard to replicate in C++

On Nov 27, 2017 6:19 PM, "David E DeMarle" <dave.demarle at kitware.com> wrote:

> Finally had a second to look into it.
>
> There seem to be issues with short word type (and likely endian) in
> the ospray volume renderer interface. Converting the array to float
> results in a close match between ospray and gl volume rendered data.
>
> Sorry for the hassle and delay Ian.
>
> I'll file a bug report and we'll try and get it addressed.
>
> Attached find a sample rendered with lighting and shadows enabled.
>
> David E DeMarle
> Kitware, Inc.
> Principal Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
> On Wed, Nov 8, 2017 at 4:57 AM, ianl <ilindsay at insigniamedical.co.uk>
> wrote:
> > Hi David,
> >
> > Basically any DICOM CT set will do, but a good example is the Visible
> Human
> > Female Ankle, available here:
> > https://mri.radiology.uiowa.edu/VHDicom/VHFCT1mm/VHF-Ankle.tar.gz
> >
> > This renders fine (see image) with the GPU renderer. I get a totally
> black
> > image when I add in the OSPRay render pass. I have verified this by
> writing
> > a loop to check the value of all output pixels, all end up as zeros.
> >
> > <http://vtk.1045678.n5.nabble.com/file/t147622/render.png>
> >
> > I have had a play around with the TestOSPRayVolumeRenderer.cxx test. I
> > removed the data surface filter so the test only renders the volumetric
> > image, this seems to render fine with OSPRay, so it seems that my set-up
> is
> > ok.
> >
> > As another test, I added a marching cubes filter to extract an iso
> surface
> > to my pipeline, along with a vtkPolyDataMapper to render it. In this
> > configuration, I see a surface rendered by OSPRay, so it seems that the
> > issue is something specific to my pipeline and volumetric rendering. I'll
> > keep digging.
> >
> >
> >
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