glb_intersect.pro

NAME: glb_intersect PURPOSE: Computes the intersection of rays with GLOBE objects. CATEGORY: NV/LIB/GLB CALLING SEQUENCE: int_pts = glb_intersect(gbd, view_pts, ray_pts) ARGUMENTS: INPUT: gbd: Array (nt) of any subclass of GLOBE descriptors. view_pts: Array (nv,3,nt) giving ray origins in the BODY frame. ray_pts: Array (nv,3,nt) giving ray directions in the BODY frame. OUTPUT: NONE KEYWORDS: INPUT: nosolve: If set, the intersections are not computed, though the discriminant is. OUTPUT: hit: Array giving the indices of rays that hit the object in the forward direction. miss: Array giving the indices of rays that miss the object. score: Array in which each element indicates the number of forward hits. discriminant: Discriminant of the quadriatic equation used to determine the intersections. back_pts: Array (nv,3,nt) of additional intersections in order of distance from the observer. RETURN: Array (nv,3,nt) of points in the BODY frame corresponding to the first intersections with the ray. Zero vector is returned for points with no solution, including those behind the viewer. STATUS: Complete MODIFICATION HISTORY: Written by: Spitale, 1/1998 Adapted by: Spitale, 5/2016