|Message: Re: Overlap of parameterized volumes||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
(cleaning up an old incorrect comment here while I tidy up some very old mail)
My statement that "you can't use rectangular parameterized volumes inside a G4Tub" was incorrect. You can't use REPLICAS in this situation, but you CAN use parameterized volumes.
Gabriele Cosmo explained it as follows:
" as far as one manages to define a -unique- parameterization algorithm that allows to:
a] Position the different boxes within the cylinder, avoiding overlaps with it; b] Position and reduce the dimensions of the boxes as close to the border of the cylinder and avoiding overlaps with it;
then, it is possible! No problem if nested-parameterizations are applied... actually, the application of nested-parameterisation is the easiest part here, since the idea would be to: - first, slice the cylinder along Z with slices all of the same size (this could be a replica in principle... but a parameterization is just fine and simple here...); - second, parametrize the single slice with parallelepipeds with base of varied dimensions (either X or Y) according to the positioning in the cylinder (the most difficult part... one can start from the center row by row and column by column and try to fill as much as possible the area of the cylinder).
Saying that it is not possible to place parameterized boxes inside a tube is certainly not correct... A tube is like any other solid.
What is NOT possible is to apply REPLICAS, since replicas are real slices that must fill -completely- the mother volume (the cylinder), and only radial, phi or Z slices are allowed for replicas in the cylindrical case. "
John Apostolakis also privately discussed with me that it would in principal be possible to develop a new specialized parameterization for this purpose. "Create a new parameterization, where all boxes have the same basic size - except that boxes which protrude from the envelope volume are clipped."