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

[Elvis Stansvik]

Den 14 okt. 2016 3:54 em skrev "Alvaro Sanchez" <alvaro.sanchez at kitware.com
>:
>
> 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.

Hi Alvaro, and thanks for replying.

This is single component float data. Shading is turned off. Apart from that
I think it's the default settings.

I'll try to make a minimal test case including sample data. I'm going away
over the weekend. I'm bringing my laptop, but if I don't have time, you'll
at least have it on Monday.

Elvis

>
> 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
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