[ITK] [ITK-users] Euler3DTransform not taking user defined Center of Rotation?

Wed Apr 19 11:56:09 EDT 2017

Thanks Francois,

There's something strange in the matrix and Offset, this is what I get:

Center:

[-246.422, -149.871, 20]

Matrix:
1 0 0
0 1 0
0 0 1

Offset:
[0, 0, 0]

El mar., 18 de abr. de 2017 a la(s) 14:47, Francois Budin-3 [via ITK -
Users] <ml-node+s7n38127h6 at n7.nabble.com> escribió:

> Hello Matias,
>
> I used the Euler3DTransform in a python terminal to see if I had problems
> setting the center and the angle, and everything seems to work as expected:
>
> trans=itk.Euler3DTransform.D.New()
> trans.SetCenter([0,0,0])
> trans.SetRotation(10,0,0)
> trans.TransformPoint([0,0,0])
> Out[46]: itkPointD3 ([0, 0, 0])  <-expected as the transform center is
> [0,0,0]
>
> trans.SetCenter([10,0,0])
> trans.TransformPoint([0,0,0])
> Out[48]: itkPointD3 ([5.16482, -7.96596, 3.62828]) <-rotation not around
> [0,0,0] but around [10,0,0]
>
> To try to understand you problem, I would advise you to print the content
> of your transform to see if it is set as you expect. In my case, I get:
>
> Euler3DTransform (0x18da8a0)
>   RTTI typeinfo:   itk::Euler3DTransform<double>
>   Reference Count: 1
>   Modified Time: 377
>   Debug: Off
>   Object Name:
>   Observers:
>     none
>   Matrix:
>     0.483518 -0.362828 0.796596
>     0.796596 0.559609 -0.228631
>     -0.362828 0.745113 0.559609
>   Offset: [5.16482, -7.96596, 3.62828]
>   Center: [10, 0, 0]
>   Translation: [0, 0, 0]
>   Inverse:
>     0.483518 0.796596 -0.362828
>     -0.362828 0.559609 0.745113
>     0.796596 -0.228631 0.559609
>   Singular: 0
>   Euler's angles: AngleX=40 AngleY=10 AngleZ=10
>   m_ComputeZYX = 0
>
> Hope this helps,
> Francois
>
>
>
> On Mon, Apr 17, 2017 at 7:11 PM, Matias <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=38127&i=0>> wrote:
>
>> Hi, I'm trying to rotate a volume and use an user defined center but no
>> matter what value I set, it seems the rotation is always performed using
>> the same center (not sure which, maybe a default center)? Here's the code
>> I'm using.. am I missing something? typedef itk::Euler3DTransform< double >
>> TransformType; //Transform TransformType::Pointer transform =
>> TransformType::New(); double alfa, beta, gamma, centro_rotacion_X,
>> centro_rotacion_Y, centro_rotacion_Z, origenX,origenY; gamma =
>> atof(argv[2]); beta = atof(argv[3]); alfa = atof(argv[4]);
>> centro_rotacion_X = atof(argv[5]); centro_rotacion_Y = atof(argv[6]);
>> centro_rotacion_Z = atof(argv[7]); double centro[3] = { centro_rotacion_X,
>> centro_rotacion_Y, centro_rotacion_Z }; transform->SetCenter(centro);
>> transform->SetRotation(gamma, beta, alfa);
>> ------------------------------
>> View this message in context: Euler3DTransform not taking user defined
>> Center of Rotation?
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-- 
Matias

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