[IGSTK-Users] EllipsoidObject Radius

[Patrick Cheng]

Hi Jake,

The fix has been checked into the main CVS.
http://public.kitware.com/Bug/view.php?id=9310

Please give it a try.

Thank you,

Patrick

Patrick Cheng wrote:
> Hi Jake,
> 
> You are right. The problem is that the default "Size" of the
> m_EllipsoidSource is 0.5
> 
> We need to set it to be 1, if we consider the scale factors to be radius 
> not diameter.
> 
> The fix should be:
> m_EllipsoidSource->SetSize( 1.0 );
> m_EllipsoidSource->SetScale( radius[0], radius[1], radius[2] );
> 
> Thank you for reporting this.
> 
> Patrick
> 
> Jake McIvor wrote:
>> I think I found it:
>>
>> In the UpdateRepresentationProcessing and SetEllipsoidObjectProcessing
>> methods, the scale of the vtkSuperquadricSource is updated:
>>
>>  EllipsoidObjectType::ArrayType radius = m_EllipsoidObject->GetRadius();
>>     m_EllipsoidSource->SetScale( radius[0], radius[1], radius[2] );
>>
>> The second line should read:
>>    m_EllipsoidSource->SetScale( 2*radius[0], 2*radius[1], 2*radius[2] );
>>
>> Does that make sense, or am I confusing the use of the setRadius method?
>>
>> -Jake
>>
>>
>> On Thu, Jul 23, 2009 at 11:43 AM, Jake
>> McIvor<jdmcivor at interchange.ubc.ca> wrote:
>>> I believe there is a bug somewhere in the ellipsoidObject or
>>> ellipsoidObjectRepresentation classes.  When I use the SetRadius
>>> method, the resulting ellipsoid's axes are half as big as they should
>>> be ( i.e. the length of each axis is set to the radius, instead of
>>> each radius being half the legth of the axis.)
>>>
>>> My application uses the QtWidget.  Here is a code snippet that should
>>> display two 10mm spheres, touching at one point.
>>>
>>> // test ellipsoid radii
>>>
>>>       igstk::EllipsoidObject::Pointer sphere1 = 
>>> igstk::EllipsoidObject::New();
>>>       sphere1->SetRadius( 10,10,10 );
>>>
>>>       igstk::EllipsoidObjectRepresentation::Pointer sphere1rep =
>>>            igstk::EllipsoidObjectRepresentation::New();
>>>       sphere1rep->RequestSetEllipsoidObject( sphere1 );
>>>       sphere1rep->SetColor( 1.0,0.0,0.0 );
>>>       sphere1rep->SetOpacity( 0.9 );
>>>
>>>       igstk::EllipsoidObject::Pointer sphere2 = 
>>> igstk::EllipsoidObject::New();
>>>       sphere2->SetRadius(10,10,10);
>>>
>>>       igstk::EllipsoidObjectRepresentation::Pointer sphere2rep =
>>>           igstk::EllipsoidObjectRepresentation::New();
>>>       sphere2rep->RequestSetEllipsoidObject( sphere2 );
>>>       sphere2rep->SetColor( 0.0,0.0,1.0 );
>>>       sphere2rep->SetOpacity( 0.9 );
>>>
>>>       igstk::Transform identity;
>>>       
>>> identity.SetToIdentity(igstk::TimeStamp::GetLongestPossibleTime());
>>>       igstk::Transform transform;
>>>       igstk::Transform::VectorType translation;
>>>       igstk::Transform::VersorType rotation;
>>>       translation[0] = 20.0;
>>>       translation[1] = 0.0;
>>>       translation[2] = 0.0;
>>>       rotation.Set( 0.0, 0.0, 0.0, 1.0 );
>>>       igstk::Transform::ErrorType errorValue = 0;
>>>
>>>       transform.SetTranslationAndRotation(
>>>           translation, rotation, errorValue,
>>>           igstk::TimeStamp::GetLongestPossibleTime() );
>>>
>>>       sphere1->RequestSetTransformAndParent( identity, m_View );
>>>       sphere2->RequestSetTransformAndParent( transform, m_View );
>>>
>>>       m_View->RequestAddObject( sphere1rep );
>>>       m_View->RequestAddObject( sphere2rep );
>>>
>>>
>>> Cheers,
>>>
>>> Jake
>>>
>>> -- 
>>> Jake McIvor
>>> MASc Candidate, Biomedical Engineering
>>> Univerisity of British Columbia
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at 
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://public.kitware.com/cgi-bin/mailman/listinfo/igstk-users
>>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at 
>> http://www.kitware.com/opensource/opensource.html
>>
>> Follow this link to subscribe/unsubscribe:
>> http://public.kitware.com/cgi-bin/mailman/listinfo/igstk-users
>>
>>
> _______________________________________________
> Powered by www.kitware.com
> 
> Visit other Kitware open-source projects at 
> http://www.kitware.com/opensource/opensource.html
> 
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/cgi-bin/mailman/listinfo/igstk-users
> 
>