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

[Elvis Stansvik]

2016-10-19 14:03 GMT+02:00 Alvaro Sanchez <alvaro.sanchez at kitware.com>:
> Hi Elvis,
>
> thanks for the test case.  Sorry, I did not have time to run it yet but I
> will have a look at it today.
>
> It seems unlikely to me that the small data spacing is affecting jittering.
> I will come back to you after debugging a bit with your test case.

Alright, no hurry. Thanks a lot for having a look.

Elvis

>
> Cheers,
> Alvaro
>
> On Wed, Oct 19, 2016 at 1:54 AM, Elvis Stansvik
> <elvis.stansvik at orexplore.com> wrote:
>>
>> 2016-10-15 11:16 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>> > 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.
>>
>> Anyone had time to run my test case? Are you seeing the same thing?
>>
>> Elvis
>>
>> >
>> > 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
>
>
>
>
> --
> Alvaro Sanchez
> Kitware, Inc.
> Senior R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4901