section p of routines in rays.i

Home Manual Packages Global Index Keywords Quick Reference | # 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
SEE ALSO: | plray_lims, dirt_rays, internal_rays
plray_lims |
                 plray_lims, zmin, zmax, rmax

         sets the (z,r) coordinate limits for the plray command.  Subsequent
         rays will be clipped to the region from z=ZMIN to z=ZMAX, and from
         r=0 to r=RMAX.

    interpreted function, defined at i/rays.i   line 475
SEE ALSO: | plray