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<p class="MsoNormal"><span lang="DE">Dear GATE community,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal">I am having troubles with geometry definitions regarding rotations.<o:p></o:p></p>
<p class="MsoNormal">I want a slanted tungsten wire (23°) parallel to the YZ-Plane inside a water cylinder with ground area parallel to the YZ-plane.<o:p></o:p></p>
<p class="MsoNormal">Creating a mother volume as follows (world volume has no rotation):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">/gate/world/daughters/name WaterCylinder<o:p></o:p></p>
<p class="MsoNormal">/gate/world/daughters/insert cylinder<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/geometry/setRmin 0. mm<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/geometry/setRmax 70. mm<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/geometry/setHeight 140. mm<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/placement/setRotationAxis 0 1 0<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/placement/setRotationAngle 90. deg<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/setMaterial Water<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">and a daughter volume inside:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/daughters/name TungstenWire<o:p></o:p></p>
<p class="MsoNormal">/gate/WaterCylinder/daughters/insert cylinder<o:p></o:p></p>
<p class="MsoNormal">/gate/TungstenWire/geometry/setRmin 0. mm<o:p></o:p></p>
<p class="MsoNormal">/gate/TungstenWire/geometry/setRmax 0.025 mm <o:p></o:p></p>
<p class="MsoNormal">/gate/TungstenWire/geometry/setHeight 137.0 mm<o:p></o:p></p>
<p class="MsoNormal"><span lang="DE">/gate/TungstenWire/setMaterial Tungsten<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE">/gate/TungstenWire/placement/setRotationAxis 0.1955 -0.9610 -0.1955<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE">/gate/TungstenWire/placement/setRotationAngle 92.27 deg<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal">For these commands I made 2 assumptions:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>GATE is handling daughter and mother volume rotations in this order: 1. Daughter volume is rotated, 2. Mother (and all daughter volumes) are rotated<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>You cannot rotate a volume with 2 consecutive rotation commands as in<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:36.0pt">/gate/TungstenWire/placement/setRotationAxis 0 1 0<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:36.0pt"><span lang="DE">/gate/TungstenWire/placement/setRotationAngle -90 deg<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:36.0pt">/gate/TungstenWire/placement/setRotationAxis 1 0 0<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:36.0pt"><span lang="DE">/gate/TungstenWire/placement/setRotationAngle 23 deg<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:36.0pt"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:36.0pt">So I combined those 2 axis-angle rotations to a single rotation according to geometrical laws.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My Problem is now:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is working totally fine for a slanted wire parallel to the XY-plane.<o:p></o:p></p>
<p class="MsoNormal">But if I want to execute these commands (seen above) in the same fashion for a slanted wire parallel to the YZ-Plane, the rotation is not executed correctly (see attached image, wire is white and not slanted).<o:p></o:p></p>
<p class="MsoNormal">In fact, this wire is not slanted about 23° in any direction, it is just parallel to the z axis.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Are my assumptions wrong or is GATE really not handling these commands incorrectly?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help is really appreciated.<o:p></o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tom <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">=============================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Tom Russ, M.Sc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Projektgruppe „Image Guided Interventions“<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">Computerunterstützte Klinische Medizin<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">Medizinische Fakultät Mannheim<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">Ruprecht-Karls-Universität Heidelberg<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">Theodor-Kutzer-Ufer 1 - 3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">68167 Mannheim<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">Tel. +49 621 383-6552<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:black">E-Mail:</span><span lang="DE">
<a href="mailto:Tom.Russ@MedMa.Uni-Heidelberg.de"><span style="color:blue">Tom.Russ@MedMa.Uni-Heidelberg.de</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><a href="http://www.umm.uni-heidelberg.de/inst/cbtm/ckm/"><span style="color:blue">http://www.umm.uni-heidelberg.de/inst/cbtm/ckm/</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
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