<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal>Hi all,</div>
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<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB>there is a strange behaviour when I put some clipplanes into my volumerendering scene. In my program I perform GPU accelerated volumerendering of medical data using vtkGPUVolumeRaycastMapper. I want to add some clipplanes to see what is inside a volume. It is often that the clipplanes clip wrong. The behaviour is similar to the bug reported here: <o:p></o:p></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB><A href="http://www.vtk.org/Bug/view.php?id=12377"><FONT color=#800080>http://www.vtk.org/Bug/view.php?id=12377</FONT></A><o:p></o:p></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB>The mathematics in my code is correct. Origin and normal vector are set correct. When I change the mapper to vtkFixedPointVolumeRaycastMapper everything works fine. And the wrong clipping occurs when I use <SPAN style="COLOR: black">vtkInteractorStyleTrackballCamera and also when don’t use vtkInteractorStyleTrackballCamera and calculate the cameraposition by my own. <o:p></o:p></SPAN></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="COLOR: black; mso-ansi-language: EN-GB" lang=EN-GB>Also I figured out that the wrong clipping occurs only when the clipplane normal is not orthogonal and it occurs always when the origin is (0, 0, 0).<o:p></o:p></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB>Is somebody already working on it or does anyone know a workaround? <o:p></o:p></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB><o:p> </o:p></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB>Thanks in advance<o:p></o:p></SPAN></div>
<div style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-GB" lang=EN-GB>Andi<o:p></o:p></SPAN></div>
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