[IGSTK-Users] EllipsoidObject Radius

[Jake McIvor]

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