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

[Elvis Stansvik]

Den 14 okt. 2016 4:39 em skrev "Aashish Chaudhary" <
aashish.chaudhary at kitware.com>:
>
> 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?

I'm traveling at the moment, but I'll make a close-up screenshot as soon as
I'm stationary.

The effect I'm seeing at least has the distinct look of wood grains :)

Elvis

>
> @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
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4901
>> _______________________________________________
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