5 <a HREF="index.html"> <IMG SRC="rsl.gif"> </a>
9 <h1>RSL_get_ray_above<br>
10 RSL_get_ray_below</h1>
15 <b>#include "rsl.h"</b> <br>
16 <a href=RSL_ray_struct.html>Ray</a> *RSL_get_ray_above(<a href=RSL_volume_struct.html>Volume</a> *v, <a href=RSL_ray_struct.html>Ray</a> *current_ray); <br>
17 <a href=RSL_ray_struct.html>Ray</a> *RSL_get_ray_below(<a href=RSL_volume_struct.html>Volume</a> *v, <a href=RSL_ray_struct.html>Ray</a> *current_ray);
23 Returns a Ray that is either above or below the <b>current_ray</b>. The elevation angle is extracted from the current_ray and 1.0 is added or subtracted to/from it and the function <a href=RSL_get_sweep.html>RSL_get_sweep</a> is called. This algorithm is simple and may not be robust enough; it has already been inadequate for the GT quality control.
27 Upon successful completion, a pointer to the Ray structure is returned. Otherwise, a NULL pointer is returned.
31 <a href=RSL_get_ray_from_sweep.html>RSL_get_ray_from_sweep</a>, <a href=RSL_get_first_ray_of.html>RSL_get_first_ray_of_sweep</a>, <a href=RSL_get_first_ray_of.html>RSL_get_first_ray_of_volume</a>, <a href=RSL_get_ray.html>RSL_get_ray,</a> <a href=RSL_get_sweep.html>RSL_get_sweep</a>.
34 <p>Author: <a href=john.merritt.html>John H. Merritt</a>