Re: Overlap checking

Dear Andreas and all,

here in attachment there is a test macro I created to check this. This macro simply creates two boxes and displaces them into a container in such a way that they overlap by a quite large region. Nevertheless, when I do the overlap check there, it finds no overlaps.

I am working with the Aliroot head of last friday and ROOT v5.16.00

I don't know what else I should do to make it tell me that there "are" overlaps, but on the other side I cannot work if I cannot rely on the overlap finder.

Any help will be extremely useful to me. Thanks in advance.

Cheers,

       Alberto

Andreas Morsch wrote:
> Dear Alberto,
> indeed not all overlaps can be detected in an analytical way.
> Please use the overlap checking with the option "s" = sampling.
> Best regards - Andreas.
>
>
>> Dear all,
>>
>> I wrote this email to both ROOT and AliROOT mailing lists, because I don't
>> know at what level the problem could be.
>> I have implemented something with TGeo, and when I try to draw it with the
>> OpenGL viewer, I get a picture like the one I attaches (it is a detail of the
>> whole).
>> As it is quite evident, there IS an overlap, because I didn't compute
>> correctly the translation of the blue box in the picture, and then it is not
>> placed exactly in the hole I prepared for it, and something "enters" the
>> yellow volume before it. Nevertheless, when I run the "CheckOverlaps" method
>> of gGeoManager, it tells me that there are NO overlaps.
>> What's wrong in my test macro? I attached it also to the email, but the
>> geometry object I created is not in CVS, so you can just look at the code and
>> tell me if there is something wrong in how I use the geometry objects.
>>
>> Thanks for any help
>>
>> Best regards,
>>
>> Alberto
>>
>>
>
>