functions in rays.i - p

picture_rays


             picture_rays(xpict, ypict, ray)  
          or picture_rays(xpict, ypict, ray, theta_up, phi_up)  
 
     returns 2-D array of rays, one at the center of each zone (which  
     represents a pixel here) of the mesh (XPICT, YPICT).  The rays are  
     all parallel to the given RAY (a 3, 5, or 6 element vector).  The  
     (XPICT, YPICT) coordinates are in the plane perpendicular to the rays,  
     with the origin XPICT=YPICT=0 at the given RAY.  
     If (THETA_UP, PHI_UP) are given, the +YPICT-axis will lie along the  
     projection of the (THETA_UP, PHI_UP) direction into the (XPICT, YPICT)  
     plane.  The default (THETA_UP, PHI_UP) is (pi/2, pi/2) -- the +y-axis  
     -- unless (THETA, PHI) is the y-axis, in which case it is (pi/2, 0)  
     -- the +x-axis.  This matches the DIRT/TDG ray coordinate convention  
     in the sense that if RAY is [0,0,theta], then  
     (zncen(XPICT),zncen(YPICT)) are the DIRT/TDG (x,y) coordinates for  
     the rays.  
     If XPICT and YPICT are imax-by-jmax, the returned array will have  
     dimensions 5-by-(imax-1)-by-(jmax-1).  That is, "best" coordinates  
     are returned.  The (x,y,z) of all of the returned rays will lie in  
     the plane perpendicular to the ray passing through the given central  
     RAY.  
interpreted function, defined at i/rays.i   line 265

SEE ALSO:

form_rays, best_rays, dirt_rays,
internal_rays, area

plray


             plray, ray  
 
     where RAY is a vector of length 5 representing [x, y, z, theta, phi]  
     -- a point (x,y,z) on the ray, and the ray direction (theta,phi)  
     relative to the z-axis.  The ray hyperbola is plotted with the  
     z-axis horizontal.  The portion of the ray plotted is determined  
     by the plray_lims command, which must be issued prior to the first  
     plray.  
     The 3 and 6 component ray formats are also accepted.  
interpreted function, defined at i/rays.i   line 340