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

[Alvaro Sanchez]

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.

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
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