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Coordinates problems. How to convert from one system to another

  1. Oct 27, 2011 #1
    1. The problem statement, all variables and given/known data

    Hi

    I got a problem with some simple modeling. The original code assumes a spherical cloud with a central source, and it assumes that the source sits at the centre of the sphere. I want to change this model and instead of using photons coming from the central source, I want to assume that the photons start from the surface of the sphere.


    2. Relevant equations

    The original parameters are:
    Initial Location
    xp = xs
    yp = ys
    zp = zs

    Set the photon of travel ---------
    ! nxp=sint*cos(phi)
    ! nyp=sint*sin(phi)
    ! nzp=cost

    I used spherical coordinates for the starting point (r,t,phi)

    What sort of conversion is needed in the setting of the photon travel?

    3. The attempt at a solution


    Any hints/help is more than welcome

    Thanks a lot in advance
     
  2. jcsd
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