[vtkusers] VolumeRendering Window Width and Window Level

[Sankhesh Jhaveri]

Hello Mallikarjuna,

vtkInteractorStyleImage provides events for window level changes. See:
http://www.vtk.org/doc/nightly/html/classvtkInteractorStyleImage.html

You can add an observer to the vtkCommand::WindowLevelEvent or
vtkCommand::EndWindowLevelEvent and change the functions as you like. On a
side note, if all you are changing is the window width and level, you can
just pass those values to
vtkFixedPointVolumeRayCastMapper::SetFinalColorWindow() and
SetFinalColorLevel().

Hope that helps.


Warm regards,
Sankhesh



On Wed, Sep 23, 2015 at 2:48 PM, Mallikarjun K <mallikarjun49 at gmail.com>
wrote:

> Hi Aashish,
>
> I have created a simple program which does volume rendering using
> vtkfixedpointraycastmapper. Now what I am trying to achieve is that when I
> change the window/level by left mouse click+drag on the renderwindow, then
>  want to change the color volume characteristics by means of window/level.
>
> I used vtkInteractorstyleimage interactor style to change the window/level
>  on left mouse click+drag and in a call back I am getting the window and
> level using vtkInteractorStyleImage::GetWindowLevelCurrentPosition. Based
> on these w/l  I want to change/modify the color transferfunction and
> opacity transfer function.
>
> please can you suggest me how can I achieve it.
>
> Thank you in advance.
>
>
>
> On Wed, Sep 23, 2015 at 11:23 PM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
>> Can you describe more in detail what you are trying to do? We have
>> piecewise method for transfer functions. What value you set for each step
>> depends on what is needed.
>>
>> - aashsih
>>
>> On Tue, Sep 22, 2015 at 12:28 AM, Mallikarjun K <mallikarjun49 at gmail.com>
>> wrote:
>>
>>>
>>> Hi Everyone,
>>>
>>> How can I set color transfer function and opacity transfer function
>>> based on window width and window level ?
>>>
>>>
>>>
>>> Thanks in advance..
>>>
>>> Regards,
>>> Mallikarjun
>>>
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>>
>>
>> --
>>
>>
>>
>> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.
>> *
>> *| http://www.kitware.com/company/team/chaudhary.html
>> <http://www.kitware.com/company/team/chaudhary.html>*
>>
>
>
>
> --
> *With Kind Regards:*
> Mallikarjuna K,
> 07795531103/09908238861.
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
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>
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