[gate-users] GPS confine command

[Mutanga Theodore]

Greetings,
Just to thank you for the explanation, Now I understand what's going on,
it's a bit difficult since one can't visualize  sources.

Regards

Theo

> Theo,
>
>> Greetings
>>
>> I am trying to understand the essence of the GPS command confine
>> command.
>>
>> Suppose I use confine=vol_p where my vol is a half cylinder and my
>> source
>> is a box source ( hypothetically) What happpens with the points that are
>> not in the intersection of the source (box) and vol (half cylinder ) ?
>> Will there  be any emmisions from those points ? Here my box source
>> encloses the halfcylinder.
>
> When using the confine command, the primary generator first selects a
> random  point in the source (in this case the rectangle). It then checks
> if this point is within the confinement (the cylinder). If this is not
> the case another point is selected etc. If it is within the confinement
> a primary is generated on this point.
>
> Emmission therefore only occur from the intersection of both volumes.
>
>>
>> Please I would like someone with more insight into these to comment. I
>> am
>> saying so cos I can't find gps commands that can be used for creating
>> sources shaped like half cylinders .
>
> You can use a confinement to define a half-cylinder source. You could,
> for example, choose a complete cylinder as your source, and confine it
> to the half-cylinder phantom. However, it is better if you choose you
> source volume as close a possible to the volume of the confinement.
> Otherwise, the loop - generate position, check if position is inside
> confinement, if not generate new position - can slow down your simulation.
>
> Hope it helps.
>
> Regards,
>
> Jan
>
>>
>>
>> Cheers
>>
>> Theo
>>
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>
> --
> D.J. van der Laan
> Delft University of Technology
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