[vtkusers] vtkTransform and Rotations !!

[Glen Lehmann]

Here's the test I just ran using VTK 4.2.0 and last night's cvs build;

 >>> b = vtkTransform()
 >>> b.RotateZ(0)
 >>> b.RotateX(90)
 >>> b.RotateY(90)
 >>> print b.GetOrientation()
(90.0, -0.0, 90.0)

I'm afraid I may not be able to offer any further advice to you, 
Sebastien.  For the sake of the rest of the list, perhaps you could 
provide some info about your OS, vtk vesion, python version, etc...

Best of luck,
Glen


Sebastien Auclair wrote:

>Glen,
>
>I just tested your python code (in python) and its not working !
>
>Try again but with the initial values i introduced (90, 90, 0) :
>
>  
>
>>>>from vtkpython import *
>>>>a = vtkTransform()
>>>>a.RotateZ(0)
>>>>a.RotateX(90)
>>>>a.RotateY(90)
>>>>print a.GetOrientation()
>>>>        
>>>>
>(90.0, 0.0, 90.0)
>  
>
>
>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 3:33 PM
>Subject: Re: [vtkusers] vtkTransform and Rotations !!
>
>
>  
>
>>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
>>>>>
>>>>>_______________________________________________
>>>>>This is the private VTK discussion list.
>>>>>Please keep messages on-topic. Check the FAQ at:
>>>>>
>>>>>
>>>>>          
>>>>>
>>><http://public.kitware.com/cgi-bin/vtkfaq>
>>>
>>>
>>>      
>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>_______________________________________________
>>>>This is the private VTK discussion list.
>>>>Please keep messages on-topic. Check the FAQ at:
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>>>>
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>>>
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>  
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>>>      
>>>
>
>_______________________________________________
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>Please keep messages on-topic. Check the FAQ at: <http://public.kitware.com/cgi-bin/vtkfaq>
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>  
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