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# 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