<div dir="ltr"><div>Hello, </div><div><br></div><div><span style="font-size:12.8px">To my knowledge, RegularParameterization with flag skipEqualMaterials is still buggy (it should be disabled: if someone know this code, please propose a pull request to correct or disable this option). </span><br></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Use either: </span></div><div><span style="font-size:12.8px">- ImageNestedParametrisedVolume : simple conventional navigator, similar to regular, (slightly faster)</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">- ImageRegionalizedVolume as proposed by Maxime. It could be 3-4 times faster in some cases but it depends on what you are storing during the simulation. If it is a dose map, take care to the statistical uncertainties. If you are only interested in particle outgoing the volume (for imaging for example), it is safe to use. Of course, the speed up depends on the voxelized volume (faster if lot of similar material). </span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Doc is here: <a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide_V8.0:Voxelized_Source_and_Phantom#Nested_parameterization_method">http://wiki.opengatecollaboration.org/index.php/Users_Guide_V8.0:Voxelized_Source_and_Phantom#Nested_parameterization_method</a></span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">David</span></div><div><span style="font-size:12.8px"><br></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Feb 10, 2017 at 4:45 PM, Maxime Chauvin <span dir="ltr"><<a href="mailto:maxime.chauvin@inserm.fr" target="_blank">maxime.chauvin@inserm.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hello Nicolas,<div><br></div><div>I had the same problem as you and couldn’t fix it. On the other hand there is a even more efficient way using</div><div>ImageRegionalizedVolume. It will further speed up the simulation especially if your geometry has a lot of common voxel</div><div>and you will get rid of this warning.</div><div><br></div><div>Cheers,</div><div> Maxime </div><div><br><div><blockquote type="cite"><div><div class="h5"><div>On 10 Feb 2017, at 14:41, Triltsch, Nicolas <<a href="mailto:nicolas.triltsch@tum.de" target="_blank">nicolas.triltsch@tum.de</a>> wrote:</div><br class="m_-7303347453256307962Apple-interchange-newline"></div></div><div><div><div class="h5">
<div bgcolor="#FFFFFF" text="#000000"><p>Hello,</p><p>I tried to speed up my simulation by choosing Regular
Parameterization (with flag skipEqualMaterials to 1) instead of
Nested Parameterization, because my Volume got a lot of voxels
with the same material. It did indeed speed up the simulation by a
factor of 15, but some projections of my CT simulation failed
(error: segmentation fault; crash).</p><p>Now I saw that during the initialization phase of gate it states
the following: <br>
</p><p><i>### WARNING ### setSkipEqualMaterials at false !! The Geant4
method is not safe since the release 9.5 - Need to be fixed</i><br>
<br>
</p>
I am pretty sure that this warning is somehow connected to the
warning. Does anyone know if there had been a bug fix for Geant4
v10.2.2?<br>
<br>
In the appendix there is a screenshot of the error.<br>
<br>
Cheers,<br>
Nico<br>
<pre class="m_-7303347453256307962moz-signature" cols="72">--
B.Sc. Nicolas Triltsch
Masterand
Technische Universität München
Physik-Department
Lehrstuhl für Biomedizinische Physik E17
James-Franck-Straße 1
85748 Garching b. München
Tel: <a href="tel:+49%2089%2028912591" value="+498928912591" target="_blank">+49 89 289 12591</a>
<a class="m_-7303347453256307962moz-txt-link-abbreviated" href="mailto:nicolas.triltsch@tum.de" target="_blank">nicolas.triltsch@tum.de</a>
<a class="m_-7303347453256307962moz-txt-link-abbreviated" href="http://www.e17.ph.tum.de/" target="_blank">www.e17.ph.tum.de</a></pre>
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