[vtkusers] Problems in rendering volume with vtkOpenVR

[Ken Martin]

I pushed a fix to the OpenVR remote module. You will need to make sure you
set MultiSamples(0) on your renderwindow before you render as the issue
involved reading from a multisampled buffer.  I did test with a simple
Volume Rendering example and it worked. There did seem to be a
clipping/bbox issue with the volume when I adjusted it's position and
orientation but I suspect that is a bug in the volume rendering code.

Thanks
Ken

On Wed, Jul 6, 2016 at 4:30 PM, Ken Martin <ken.martin at kitware.com> wrote:

> I have not tested volume rendering with vtkOpenVR but ... I can't think of
> any reason it would not work. I suspect there is maybe a some sort of issue
> with the volume renderer copying the frame back into (or out of) the frame
> buffer. I suspect if you can find the issue the fix will be pretty easy. If
> I get a chance I'll try giving it a shot.
>
> On Wed, Jul 6, 2016 at 1:54 PM, Guilherme Alcarde Gallo <
> guilherme.gallo at eldorado.org.br> wrote:
>
>> Hello all!
>>
>>
>>
>> I have succeeded in building VTK with vtkOpenVR remote module and running
>> a simple Cone example in my OSVR HMD.
>>
>> But when I’ve attempted to run the volume rendering example
>> "GPURenderDemo", I got a black screen and a lot of repetitive errors:
>>
>> *ERROR: In*
>>
>> *C:\VTK-master\Rendering\OpenGL2\vtkTextureObject.cxx,*
>>
>> *line 2035*
>>
>> *vtkTextureObject (0000000BE6462060): failed at glCopyTexImage2D 6402 1
>> OpenGL errors detected*
>>
>> *  0 : (1282) Invalid operation*
>>
>>
>>
>> Also, I have tried to run the CPU-based volume rendering example
>> “FixedPointVolumeRayCastMapperCT”.
>>
>> Although the performance is poor, it works, since the texture
>> successfully appears in the HMD and its tracking is integrated with the
>> WindowInteractor.
>>
>>
>>
>> My colleague has made an investigation about this issue comparing both
>> examples, he concluded that the problem is related with the
>> “SmartVolumeMapper” class.
>>
>>
>>
>> So I would like to ask a few questions:
>>
>> 1)      Does the remote module vtkOpenVR has support for volume
>> rendering?
>>
>> 2a) If it does, what I'm doing wrong? Is there any problem with
>> SmartVolumeMapper implementation for running vtkOpenVr applications?
>>
>> 2b) If it don’t, how I can add volume rendering support for vtkOpenVR? (I
>> and my team are willing to do this)
>>
>>
>>
>> Thank you very much!
>>
>> Guilherme
>>
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>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
> 518 371 3971
>
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-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

This communication, including all attachments, contains confidential and
legally privileged information, and it is intended only for the use of the
addressee.  Access to this email by anyone else is unauthorized. If you are
not the intended recipient, any disclosure, copying, distribution or any
action taken in reliance on it is prohibited and may be unlawful. If you
received this communication in error please notify us immediately and
destroy the original message.  Thank you.
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