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

[Elvis Stansvik]

2016-10-14 15:54 GMT+02:00 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 again Alvaro,

Here's a minimal test case including sample data (129 MB):

    https://dl.dropboxusercontent.com/u/22350696/test_grain.tar.gz

Build with:

    cmake .
    make

and run with:

    ./test_grain rec-0300mm-0400mm.xml

The result should be as in the attached screenshot.

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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