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

[Aashish Chaudhary]

Based on the video its hard to say if it is the wood grain I am seeing or
something else is going on. Can you send a high-res static picture?

@Alvaro, it would be good to look at the jittering code carefully as well.

- Aashish

On Fri, Oct 14, 2016 at 9:54 AM Alvaro Sanchez <alvaro.sanchez at kitware.com>
wrote:

> 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.
>
> 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
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