<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi there,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I implemented an automatic rendering test (using a VTK testing macro) which just loads a 5x5 pixel test image and renders it into a render window.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>In general, the test works very well, but I discovered that if the user establishes a VPN connection before the DartClient execution, the test will fail. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>You can see the result of a failed test on our dashboard here:<o:p></o:p></span></p><p class=MsoNormal><a href="http://cdash.mitk.org/testDetails.php?test=2711617&build=105036">http://cdash.mitk.org/testDetails.php?test=2711617&build=105036</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>I think that VPN blocks some OpenGL features and as a consequence VTK has to use software rendering and has to rescale the 5x5 pixel image to the next power of pixel size which is 8. You can see on the images, that the TestImage clearly has a resolution of 8x8 for some reason. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Can anyone give me more information about this? Is my theory correct? How could I avoid this behavior? Would it help if I would use Mesa software rendering to perform the test?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Regards<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Thomas<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>