Backward tracing of photons. mc_backward takes either zero, two or four coordinates:
  mc_backward [ix_start iy_start] [ix_end iy_end]
where ix_start, iy_start is the index of the sample pixel to be calculated or the pixel area from ix_start to ix_end and iy_start to iy_end. All x-indices must be in the range of 0 ... (Nx-1) and y-indices the range of 0 ... (Ny-1). If no coordinates are specified, all sample pixels will be calculated. mc_backward computes radiances and downward diffuse irradiances. If a different quantity is required, please use mc_backward_output.





Arve Kylling 2010-03-10