Re: FLUKA: LATTICE card

[paola sala <paola.sala@cern.ch>]

Dear Lev,
I'll try to help:

Lev Chekhtman wrote:

> Hello, I am trying to build geometry using LATTICE card and found that the
> description in the manual is not quite clear.
> As far as I understand the basic unit has to be described together with
> the lattice of void regions in the same real system of coordinates.

right


>
> The transformation of real coordinates to the ones of basic unit is done
> by LATTIC subroutine. What is meant by the symmetric coordinates in the
> basic unit, coordinates relative to some zero point in it? or real
> coordinates inside the basic unit as they are introduced in the
> description of geometry?

real coordinates.

> In the LATTIC subroutine what is exactly the
> difference between the transformation I have to specify in LATNOR entry
> and the transformation I specify by the relationship between UB and WB?

the LATNOR transformation is the inverse of the one between UB and WB

>
> If I have all coordinate systems parallel (no rotations), do I  have to
> write smthing in LATNOR?

In principle not, since the input and output vectors are the same. Writing
down the equality could help when you re-read the code after some time...


>
> Can such geometry be viewed using PLOTGEOM card?

Yes


>
> Can you give me any example of using LATTICE card?

see the attached file

>
> Regards, Lev Shekhtman.

  Good luck
        Paola