C INCLUDE 'rparc.inc' C ------------------------------------------------------------------ INTEGER LURPAR,IRAY0,JRAY,JTYPE REAL G1,G2,X1,X2,X1G1,X2G1,X1G2,X2G2,GG11,GG12,GG22 COMMON/RPARC/LURPAR,IRAY0,JRAY,JTYPE, * G1,G2,X1,X2,X1G1,X2G1,X1G2,X2G2,GG11,GG12,GG22 SAVE /RPARC/ C .................................................................. INTEGER MRPARH PARAMETER (MRPARH=10000) INTEGER JPOINT,KMAH,INDMIN,NRPARH,IRPARH(0:MRPARH) COMMON/RPARH/JPOINT,KMAH,INDMIN,NRPARH,IRPARH SAVE /RPARH/ C ------------------------------------------------------------------ C C LURPAR..Logical unit number of the external input device C containing the input data. C IRAY0...Difference IRAY0=IRAY-JRAY between index of a ray within C the elementary wave, and the index within one shooting C domain. C JRAY... Reference index of the ray within one shooting domain C (not within one elementary wave). C JTYPE...Reserved for future use. C G1,G2...Normalized shooting parameters. Here, normalized means C that the shooting domain is (0,1)*(0,1) in the normalized C shooting parameters. C For one-parametric shooting: C G1,G2: multiplied by ANUM and BNUM, respectively. C G1: the first, shooting parameter. C G2: the second, fixed parameter. C X1,X2...Values of the X-functions at the point of intersection C with the reference surface (e.g., two selected coordinates C of the point of intersection). C X1G1,X2G1,X1G2,X2G2... Derivatives of the X-functions with respect C to the normalized shooting parameters. C GG11,GG12,GG22... Metric tensor in ray-parameter domain measuring C the distance between rays. C C JPOINT..The number of crosssections of the computed ray with the C surface ISRFR. Because, for the structural interfaces, C the positive or negative side of the surface is specified, C either zero or two crosssections correspond to the C reflection from the surface ISRFR. C KMAH... KMAH index (number of caustic points along the ray) at the C reference surface. Zero if the ray does not reach the C reference surface. C INDMIN..Absolute value of the ray-history index minus the C location of the corresponding ray history in the array C IRPARH of the common block /RPARH/. C NRPARH..Index in the array IRPARH of the last element of the C history of the computed ray, see below. C IRPARH..Array containing different histories of rays. Under the C ray history we understand here the block-surface code (see C the file 'code.for') describing the behaviour of C individual rays, complemented by the indication IEND C specifying the reason of the termination of the C computation of the ray (see the subroutine RAY2 of the C file 'ray.for'). C IRPARH(0)... Number of different ray histories encountered C yet. C IRPARH(I),I=1,...,IRPARH(0)... Indices in the array IRPARH C of the last elements of individual ray histories. C IRPARH(I),I=IRPARH(0)+1,...,IRPARH(IRPARH(0))... C Individual encountered ray histories. C IRPARH(I),I=IRPARH(IRPARH(0)),...,NRPARH... History of the C computed ray. After finishing computation of the ray, C it is compared with the recorded histories. If it C appears to be a new history, it is recorded, otherwise C it is forgotten. C If the array IRPARH is too small to keep all different ray C histories corresponding to the computed elementary wave, C the oldest histories are forgotten. C C Common block /RPARC/ is included in external procedures RPAR1, C RPAR2, RPAR32, and RPAR4 of 'rpar.for', in 'scropc.for'. C C Common block /RPARH/ is included in external procedures RPAR2, C RPAR31, RPAR32, IHIST, and SRPARH of 'rpar.for'. C C Date: 1998, December 1 C Coded by Ludek Klimes C C======================================================================= C