[vtk-developers] UseJitteringOn() has no effect in 7.1.0.rc1

[Elvis Stansvik]

2016-10-15 9:26 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
> 2016-10-14 17:14 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>> Den 14 okt. 2016 4:39 em skrev "Aashish Chaudhary"
>> <aashish.chaudhary at kitware.com>:
>>>
>>> Based on the video its hard to say if it is the wood grain I am seeing or
>>> something else is going on. Can you send a high-res static picture?
>>
>> I'm traveling at the moment, but I'll make a close-up screenshot as soon as
>> I'm stationary.
>
> Attaching a screenshot showing the effect. It's easiest to see in the
> central close-up view.

Bah, forgot the attachment. Here it is.

Elvis

>
> I'll make a small test case as soon as I can.
>
> Elvis
>
>>
>> The effect I'm seeing at least has the distinct look of wood grains :)
>>
>> Elvis
>>
>>>
>>> @Alvaro, it would be good to look at the jittering code carefully as well.
>>>
>>> - Aashish
>>>
>>> On Fri, Oct 14, 2016 at 9:54 AM Alvaro Sanchez
>>> <alvaro.sanchez at kitware.com> wrote:
>>>>
>>>> Hi Elvis,
>>>>
>>>> the mapper uses a vtkPerlinNoise instance to generate the jitter noise
>>>> and as far as I know there are currently no knobs exposed to tweak the
>>>> amount of ray perturbation.  Are you using the GL2 backend?  It would also
>>>> be good to know what features are active along with ray jittering (multiple
>>>> components, etc.), so if you could provide some sample data or code would be
>>>> very helpful.
>>>>
>>>> Thanks!
>>>> Alvaro
>>>>
>>>> On Fri, Oct 14, 2016 at 3:47 AM, Elvis Stansvik
>>>> <elvis.stansvik at orexplore.com> wrote:
>>>>>
>>>>> Hi all,
>>>>>
>>>>> I updated our product to use VTK 7.1.0.rc1, as I was interested in
>>>>> trying out vtkGPUVolumeRayCastMapper::UseJitteringOn() to get rid of
>>>>> some woodgrain effects we're suffering from in our volume rendering
>>>>> (mostly when the volumes are rendered very opaque).
>>>>>
>>>>> But turning the option on seems to have little to no effect. This is
>>>>> the result with the option on:
>>>>>
>>>>>     https://dl.dropboxusercontent.com/u/22350696/out.ogv
>>>>>
>>>>> It looks about the same to me as it does with the option off.
>>>>>
>>>>> Are there any knobs for this option? How does it determine how much to
>>>>> perturbate the rays?
>>>>>
>>>>> Thanks for any advise.
>>>>>
>>>>> Elvis
>>>>> _______________________________________________
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>>>>
>>>>
>>>>
>>>> --
>>>> Alvaro Sanchez
>>>> Kitware, Inc.
>>>> Senior R&D Engineer
>>>> 21 Corporate Drive
>>>> Clifton Park, NY 12065-8662
>>>> Phone: 518-881-4901
>>>> _______________________________________________
>>>> Powered by www.kitware.com
>>>>
>>>> Visit other Kitware open-source projects at
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