In line 211 of photon.c, the velocity component of the working grid point in the direction of the photon is calculated. However the grid point velocity is projected not onto the direction of the photon (initdir) but onto the direction of the first edge to be followed.
In line 211 of photon.c, the velocity component of the working grid point in the direction of the photon is calculated. However the grid point velocity is projected not onto the direction of the photon (initdir) but onto the direction of the first edge to be followed.