[IGSTK-Users] Setting a color to ImageSpatialObjectRepresentation = Segmentation Fault

[Vincent Gratsac]

Hi Andinet,

I noted that the modifications you made to the IGSTK cvs do not contain 
the line concerning the opacity :
>   m_LUT->SetAlphaRange(m_Opacity, m_Opacity); 
Is it because you don't want an ImageSpatialObjectRepresentation being 
able to be transparent ?

Vincent

Andinet Enquobahrie wrote:
> Hi Vincent.
>
> Thanks for your contribution!
>
> We will review it and make the modification to the main CVS.
>
> -Andinet
>
>> Hi igstk-users,
>>
>> I made some modifications to 
>> igstkImageSpatialObjectRepresentation.txx code in order to correct my 
>> problem when setting a color or an opacity to an image spatial object.
>> Here are the few lines that have been changed in CreateActors() method:
>>
>>>   // Converting RGB color to HSV values       float hue=0;
>>>   float saturation=0;
>>>   float value=0;
>>>   vtkMath::RGBToHSV(this->GetRed(), this->GetGreen(), 
>>> this->GetBlue(),&hue, &saturation, &value);
>>>
>>>   m_LUT->SetTableRange ( (m_Level - m_Window/2.0), (m_Level + 
>>> m_Window/2.0) );      m_LUT->SetSaturationRange (saturation, 
>>> saturation);
>>>   m_LUT->SetHueRange (hue, hue);
>>>   m_LUT->SetValueRange (0, value);
>>>   m_LUT->SetAlphaRange(m_Opacity, m_Opacity);
>>>   m_LUT->SetRampToLinear();
>>>  
>>>
>>>   m_MapColors->SetLookupTable( m_LUT );
>>
>> Note that you have to include vtkMath.h file.
>>
>> I hope this code will help someone, or could be integrate to IGSTK in 
>> the future.
>>
>> Have a nice day,
>>
>> Vincent
>>
>> Vincent Gratsac a écrit :
>>
>>> Hi igstk-users,
>>>
>>> I'm trying to set a color (other than white) to an 
>>> ImageSpatialObjectRepresentation.
>>> With my application, it causes a segmentation fault. I add one line 
>>> in the NeedleBiopsy example to check that it does not come from by 
>>> code and I also get a seg fault :
>>>
>>>> m_ImageRepresentationAxial->SetColor(0.5,1,1);
>>>
>>>
>>> Is it a bug or did I make a mistake ?
>>>
>>> Note that my code works fine while setting the color the a 
>>> MeshObjectRepresentation.
>>>
>>> Vincent
>>>
>>
>
>

-- 
Vincent Gratsac
----------------------------------------------------
Unité/Projet VisAGeS U746
INSERM/INRIA/CNRS/U. de Rennes I
IRISA
Campus de Beaulieu, 35042 Rennes Cedex, France

Ph:  +33 (0) 2 23 23 49 20/ Fax: +33/0 2 99 84 71 71
email: Vincent.Gratsac at irisa.fr
http://www.irisa.fr/visages/
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