[vtkusers] Shadow support on volume rendering

[David E DeMarle]

Shouldn't be hard

dicom reader -> vtkImageCast (for the time being) -> volume render

enable volumetric lighting on the volume mapper

renderer->UseShadowsOn

insert ospraypass on renderer




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


On Mon, Nov 27, 2017 at 6:25 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> 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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