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

[Alvaro Sanchez]

Indeed Elvis, pretty standard settings, I can try to reproduce it here
without a specific test case.  What are the volume dimensions?

On Fri, Oct 14, 2016 at 11:11 AM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:

>
> 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
>



-- 
Alvaro Sanchez
Kitware, Inc.
Senior R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4901
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