[vtkusers] Shadow support on volume rendering

[David E DeMarle]

Another note - if your data is unstructured grid, neither ospray volume
rendering path will display anything unless you resample to image data.
That limitation will be removed in the next couple of days as OSPRay 1.4
now has support for unstructured grid volume rendering.


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

On Fri, Oct 27, 2017 at 12:17 PM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> using vtkOSPRayVolumeMapper directly instead of vtkSmartVolumeMapper
>
>
> To get volumetric shadows everything in the renderer has to be rendered by
> ospray (i.e. just stick an OSPRay pass into your renderer and let it take
> over).
>
> The osprayvolumemapper option (both directly and within smartvolumemapper)
> makes ospray responsible for rendering only that one volume within and
> otherwise openGL rendered scene. It won't produce shadows on the GL
> rendered data. It should otherwise work though, and without seeing your
> code I can't guess from what you posted what is going wrong. Try running
> the ospray related tests in your VTK build (ctest -R OSPRay) to diagnose
> the setup further.
>
>
>
>
> David E DeMarle
> Kitware, Inc.
> Principal Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909 <(518)%20881-4909>
>
> On Fri, Oct 27, 2017 at 11:58 AM, ianl <ilindsay at insigniamedical.co.uk>
> wrote:
>
>> Hi David,
>>
>> I have finally got some time to have a quick revisit of this (was that
>> really a year ago!).
>>
>> Long story short, I simply can't seem to get it to do anything. I have
>> tried
>> inserting an OSPRayPass into the renderer (following the pattern in the
>> OSPRay tests), and I have also tried using vtkOSPRayVolumeMapper directly
>> instead of vtkSmartVolumeMapper. I should note that the pipeline I am
>> testing with works fine with the GPU based renderer.
>>
>> I am using the latest OSPRay and embree builds from their respective
>> websites on Windows and VTK 8.0.1 built using VS 2017.
>>
>> As far as I can see, I am getting a std::runtime_error exception in
>> vtkOSPRayRendererNode.cxx, line 432:
>>
>>   OSPData lightArray = ospNewData(this->Lights.size(), OSP_OBJECT,
>>     (this->Lights.size()?&this->Lights[0]:NULL), 0);
>>
>> The Lights array looks fine in the debugger with one entry as expected.
>>
>> Are there any gotchas you know of that are likely to cause this? I am a
>> bit
>> stuck presently.
>>
>> Thanks
>> Ian
>>
>>
>>
>>
>> --
>> Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Search the list archives at: http://markmail.org/search/?q=vtkusers
>>
>> Follow this link to subscribe/unsubscribe:
>> http://public.kitware.com/mailman/listinfo/vtkusers
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20171027/ab3d4c18/attachment.html>