Ok so we figured what was happening. . .<div>I thought the <span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">filterOblique transform was going from my original volume to the transformed one, but turns out that it's the opposite: it's going from the transformed volume to the original. Therefore I didn't need to find the inverse transform. Here is how I finally transformed each point:</span></div>
<div><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; "><br></span></div><div><div><span style="font-family: arial, helvetica, sans-serif; ">PointType pointout = </span><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; "> filterOblique->GetTransform( )</span><span style="font-family: arial, helvetica, sans-serif; ">->TransformPoint( point );</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; ">mesh->SetPoint( pointid, pointout );</span></div></div><div><br></div><div>Olga C Avila-Montes<div>Research Assistant, Computational Biomedicine Lab (<a href="http://www.cbl.uh.edu">www.cbl.uh.edu</a>)<br>
Dept. of Computer Science, University of Houston, Houston, TX 77204-3010<br>Email: <a href="mailto:ocamcaro@gmail.com">ocamcaro@gmail.com</a><br>
<br><br><div class="gmail_quote">On Sat, Jul 2, 2011 at 7:11 PM, Olga C. Avila-Montes <span dir="ltr"><<a href="mailto:ocamcaro@gmail.com">ocamcaro@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<font face="arial, helvetica, sans-serif">Hi everyone!</font><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">I'm using the filter itk::<span style="white-space:pre-wrap">ObliqueSectionImageFilter from the I</span><span style="white-space:pre-wrap">nsight Journal article:</span></font></div>
<div><a href="http://www.insight-journal.org/browse/publication/168" target="_blank"><font face="arial, helvetica, sans-serif">http://www.insight-journal.org/browse/publication/168</font></a></div><div><font face="arial, helvetica, sans-serif">to obtain a transformed volume where I perform a segmentation and obtain its mesh using itkBinaryMask3DMeshSource. </font></div>
<div><font face="arial, helvetica, sans-serif">Each slice of the transformed volume is coming from a different plane of the original volume, and I want to map back the points from the mesh to the original volume space, but I have not been able to. . .</font></div>
<div><span style="font-family:arial, helvetica, sans-serif">I tried accessing each point from the mesh and applying the inverse transform using </span><span style="font-family:arial, helvetica, sans-serif">TransformPoint like this:</span></div>
<div><span style="font-family:arial, helvetica, sans-serif"><br></span></div><div><div><span style="font-family:arial, helvetica, sans-serif">inverseTransform = dynamic_cast< TransformType* >( filterOblique->GetTransform( )->GetInverseTransform( ).GetPointer( ) );</span></div>
<div><span style="font-family:arial, helvetica, sans-serif">PointType pointout = inverseTransform->TransformPoint( point );</span></div><div><span style="font-family:arial, helvetica, sans-serif">mesh->SetPoint( pointid, pointout );</span></div>
</div><div><span style="font-family:arial, helvetica, sans-serif"><br></span></div><div><span style="font-family:arial, helvetica, sans-serif">but is not giving me good results, and I'm not sure what I'm doing wrong</span></div>
<div></div><div><font face="arial, helvetica, sans-serif">Do you know how can this be achieved?</font></div><div><span style="font-family:arial, helvetica, sans-serif">Thanks!</span></div>
<div><font face="arial, helvetica, sans-serif"><br></font></div><font color="#888888"><font face="arial, helvetica, sans-serif">Olga C Avila-Montes<br>Research Assistant, Computational Biomedicine Lab (<a href="http://www.cbl.uh.edu" target="_blank">www.cbl.uh.edu</a>)<br>
Dept. of Computer Science, University of Houston, Houston, TX 77204-3010<br>Email: <a href="mailto:ocamcaro@gmail.com" target="_blank">ocamcaro@gmail.com</a></font><br>
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