[vtkusers] vtkTransform and Rotations !!

[Glen Lehmann]

I suspect it's because you've explicitly set the PostMultiply Flag, 
which will of course chage the order the rotations are applied.  Using 
the default PreMultiply, here's the output of a python test I just ran.

 >>> from vtkpython import *
 >>> a = vtkTransform()
 >>> a.RotateZ(90)
 >>> a.RotateX(40)
 >>> a.RotateY(10)
 >>> print a.GetOrientation()
(40.0, 10.0, 90.0)

Sebastien Auclair wrote:

>Hum... That too isn't working....
>
>Then i get :
>
>X= 1.27222e-014
>Y= 90
>Z= -90
>...again from initial angles:
>X=90
>Y=90
>Z=0
>
>Thanks !
>____________________________________
>Seb
>
>----- Original Message -----
>From: "Glen Lehmann" <glehmann at imaging.robarts.ca>
>To: "Sebastien Auclair" <sxa at fluent.com>
>Cc: <vtkusers at public.kitware.com>
>Sent: Thursday, March 27, 2003 3:16 PM
>Subject: Re: [vtkusers] vtkTransform and Rotations !!
>
>
>  
>
>>Hi Sebastien,
>>
>>vtkTransform performs rotations in the ZXY order.  If you do something
>>    
>>
>like;
>  
>
>>newTransform->RotateZ(Rz);
>>newTransform->RotateX(Rx);
>>newTransform->RotateY(Ry);
>>
>>then GetOrientation() will will return what you expect.
>>
>>I hope this helps you out,
>>Glen
>>
>>Sebastien Auclair wrote:
>>
>>    
>>
>>>Hi folks !
>>>
>>>I need to create a rotation matrix for x,y and z . (Please note that we
>>>aren't using vtkActor for transformation...neither vtkWindowInteractor
>>>      
>>>
>...)
>  
>
>>>I have read every post in the usergroup's repository and nothing really
>>>helped.
>>>
>>>The problem is that GetOrientation never produces to correct result.
>>>
>>>This is essentially how I do it :
>>>##################################################################
>>>vtkMatrix4x4 *matrix = vtkMatrix4x4::New();
>>>vtkTransform* newTransform = vtkTransform::New();
>>>newTransform->Identity();
>>>newTransform->PostMultiply();
>>>newTransform->Translate(-(m_origin[0]), -(m_origin[1]), -(m_origin[2]));
>>>
>>>newTransform->RotateWXYZ(y, 0,1,0);
>>>newTransform->RotateWXYZ(x, 1,0,0);
>>>newTransform->RotateWXYZ(z, 0,0,1);
>>>newTransform->Translate((m_origin[0]), (m_origin[1]), (m_origin[2]));
>>>float test[3] ;
>>>newTransform->GetOrientation(test);
>>>##################################################################
>>>For exemple,  if we try to rotate with (X=90, Y=90, Z=0), we get
>>>      
>>>
>orientation
>  
>
>>>(X=90, Y=0, Z=90).
>>>And what is the difference between RotateX and RotateWXYZ (a, 1, 0, 0)
>>>??????
>>>
>>>
>>>Thanks for any help.
>>>___________________________________________________
>>>Seb
>>>
>>>_______________________________________________
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>>>      
>>>
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>>>
>>>      
>>>
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