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

[Alvaro Sanchez]

Yeah, I guess it's also worth adding a test for ray jittering since there
is none yet.

On Fri, Oct 14, 2016 at 10:39 AM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> 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?
>
> @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 <(518)%20881-4901>
>> _______________________________________________
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>>
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-- 
Alvaro Sanchez
Kitware, Inc.
Senior R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4901
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