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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I have an application that successfully uses vtkImageInterpolator that ultimately use DICOM data read in by ITK. These data sets display correctly even when the z direction
is -1, but the interpolator does not work when the data coordinate is less than the origin.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">It is possible that the problem originates in my use of vtkVolumePicker to pick the point, but this appears well behaved, in returning a coordinate smaller than the value of
the origin, as makes sense for the direction being negative, and the point it returns is correct in the volume.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Resetting the origin doesn’t help, as the picker still returns a coordinate smaller than the (new) origin – it seems to just slide all numbers down.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Rotating the image so as to make the direction of the z axis positive does make it work – but then the display causes an unintended mirror image problem (e.g., the aorta comes
in front of the heart rather than staying behind the heart in a chest image).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I am sure it must be obvious but I have not yet seen what to do.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Thank you,</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Andy</span></i></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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