[Paraview-developers] Affine transformations in Paraview 5.0.0

[Hallock, Kevin]

Hi,

I am trying to display PLY objects that were created from NIFTI files and I know in other software (DSI Studio) the NIFTI images are co-registered by using the header information in the NIFTI file. The matrices that contain the co-registration information of the two brain atlases are:

AATG atlas

srow_x  [-1,0,0,78]
srow_y  [0,-1,0,76]
srow_z  [0,0,1,-50]

MNI atlas

srow_x  [-1,0,0,90]
srow_y  [0,1,0,-126]
srow_z  [0,0,1,-72]


These transforms are supposed to be applied in the following way:


The (x,y,z) coordinates are given by a general affine transformation
   of the (i,j,k) indexes:

     x = srow_x<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref0>[0]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref0> * i + srow_x<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref1>[1]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref1> * j + srow_x<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref2>[2]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref2> * k + srow_x<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref3>[3]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref3>
     y = srow_y<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref0>[0]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref0> * i + srow_y<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref1>[1]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref1> * j + srow_y<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref2>[2]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref2> * k + srow_y<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref3>[3]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref3>
     z = srow_z<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref0>[0]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref0> * i + srow_z<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref1>[1]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref1> * j + srow_z<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref2>[2]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref2> * k + srow_z<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref3>[3]<http://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/qsform.html#ref3>

I thought I would be able to co-register them by applying the above information via the Transform option under Properties, but the result appears to be missing at least one rotation so I am wondering if there is another way to do the affine transformation.

Thanks,

Kevin
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