[vtk-developers] Volume visualization with OpenVR

Aashish Chaudhary aashish.chaudhary at kitware.com
Tue May 16 10:52:59 EDT 2017


Thank you so much! We are looking into it as we have few ideas and will
post an update soon.

- Aashish

On Tue, May 16, 2017 at 10:44 AM Carlos Lopez <rcourant at gmail.com> wrote:

> Hi Aashish,
>
> vtk is 7.1.1 with SHA:
> b86da7eef93f75c4a7f524b3644523ae6b651bc4
>
> the exact dataset I'm using is custom, but the issue might be the same
> with any volumetric imagedata.
>
> best,
> carlos
>
>
>
> On Mon, May 15, 2017 at 2:48 PM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
>> Thanks for the images Carlos. Could you please send us the exact
>> SHA/Version of VTK and also if you can point to the dataset (I know where
>> it is but just in case).
>>
>> We have fixed a related view-clipping issue and since then we have not
>> find any issues. It is possible that 1) There is a bug 2) This is related
>> to perception since one eye is inside and the other is outside.
>>
>> - Aashish
>>
>> On Mon, May 15, 2017 at 12:52 PM Carlos Lopez <rcourant at gmail.com> wrote:
>>
> Hi Aashish,
>>>
>>> Here are the screenshots.
>>>
>>> In external.png, notice how the arm is being rendered differently for
>>> this particular angle; in the HMD I get the sense there is a sharp edge
>>> along the arm.
>>>
>>> When the camera is close enough, the mode of projection changes, and it
>>> looks like internal.png; here I do not see any edges and the 3D effect
>>> feels better to me.
>>>
>>> In the transition, for very specific points of view, I get the
>>> in-between.png picture.
>>>
>>> I think the code is working as it should, but maybe a quick solution
>>> would be to convince vtk that the data bounds are much larger that what
>>> they really are so that it always renders as internal. Is there a way to do
>>> this?
>>>
>>> thanks,
>>> carlos
>>>
>>>
>>>
>>> On Mon, May 15, 2017 at 12:18 PM, Aashish Chaudhary
>>> aashish.chaudhary at kitware.com> wrote:
>>>
>> Hi Carlos,
>>>>
>>>> Can you send a picture of the effect you are mentioning? We have a demo
>>>> that uses VR in OpenVR but we didn't notice the artifact that you have
>>>> mentioned but we also have not spent as much time as you did.
>>>>
>>>> - Aashish
>>>>
>>>> On Mon, May 15, 2017 at 11:42 AM Carlos Lopez <rcourant at gmail.com>
>>>> wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I'm visualizing a dataset from the visible human project using openVR
>>>>> and I notice that when the camera is outside of the bounds of the dataset,
>>>>> the data renders in a way that the bounding box is noticeable; because of
>>>>> the stereo projection, It is possible to see that the volumetric data is
>>>>> projected onto the faces of the bounding box (this is not visible in 2D,
>>>>> either from a monitor or if I close one eye in the HMD).
>>>>>
>>>>> If the camera is inside the bounding box, then the data renders in a
>>>>> way that this effect is no longer visible, the projection plane parallel to
>>>>> the current view removes the small discontinuity and the 3D perspective is
>>>>> restored.
>>>>>
>>>>> Is it possible to configure the volume rendering so that it always
>>>>> behaves as if the camera is inside the dataset?
>>>>>
>>>>> thanks,
>>>>> carlos
>>>>>
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