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*DECK MCTPTR
SUBROUTINE MCTPTR(IPTRK,IPRINT,NDIM,MAXMSH,ITYPBC,NUCELL,MXGSUR,
1 MXGREG,MAXPIN,IUNFLD,DGMESH,XYZL,NBIND,POS,
2 LENGTH,VDIR,ODIR,IDS,IDSO,IREG,INDX,IDIRC,
3 MESHC,NSURC,NREGC,NTPIN,CELLPO,PINCEN,INDEX,
4 IDREG,DCMESH,ITPIN,DRAPIN)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Find region/surface index from an initial position and a path to
* travel.
*
*Copyright:
* Copyright (C) 2008 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): R. Le Tellier
*
*Parameters: input
* IPTRK pointer to the TRACKING data structure.
* IPRINT print level.
* NDIM problem dimensions.
* MAXMSH maximum number of elements in MESH array.
* ITYPBC type of boundary.
* NUCELL number of cell after unfolding in
* $X$, $Y$ and $Z$ directions.
* MXGSUR maximum number of surfaces for any geometry.
* MXGREG maximum number of region for any geometry.
* MAXPIN maximum number of pins in a cell.
* IUNFLD description of unfolded geometry.
* DGMESH meshing vector for global geometry.
* XYZL undefined.
* NBIND first dimension of INDX.
* VDIR travel direction (unit vector).
*
*Parameters: output
* IDS outer surface orientation index. ABS(IDSO).
* IDSO outer surface oreientation index with +-1:X+-; +-2:Y+-;
* +-3:Z+- faces.
* IREG region/surface index.
* ODIR search (octant) direction.
*
*Parameters: input/output
* POS initial/final position.
* LENGTH length to travel/remaining length on the path.
* INDX location index of the initial/final position in the
* geometry structure.
*
*Parameters: scratch
* IDIRC undefined.
* MESHC undefined.
* NSURC undefined.
* NREGC undefined.
* NTPIN undefined.
* CELLPO undefined.
* PINCEN undefined.
* INDEX undefined.
* IDREG undefined.
* DCMESH undefined.
* ITPIN undefined.
* DRAPIN undefined.
*
*-----------------------------------------------------------------------
*
USE GANLIB
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
TYPE(C_PTR) IPTRK
INTEGER IPRINT,NDIM,MAXMSH,ITYPBC,NUCELL(3),MXGSUR,MXGREG,MAXPIN,
1 IUNFLD(2,NUCELL(1),NUCELL(2),NUCELL(3)),NBIND,ODIR(3),IREG,
2 INDX(NBIND,0:2),IDIRC(2),MESHC(4,2),NSURC(2),NREGC(2),NTPIN,
3 INDEX(5,-MXGSUR:MXGREG,2),IDREG(MXGREG,2),ITPIN(3,MAXPIN)
DOUBLE PRECISION DGMESH(-1:MAXMSH,4),XYZL(2,NDIM),POS(3),LENGTH,
1 VDIR(3),CELLPO(3,2),PINCEN(3),DCMESH(-1:MAXMSH,4,2),
2 DRAPIN(-1:4,MAXPIN)
*----
* LOCAL VARIABLES
*----
INTEGER IDIR,IBCO(3),IDS,IDSO,JJ
DOUBLE PRECISION VCOR(3),LEN,LENM
DOUBLE PRECISION EPS
PARAMETER(EPS=1.D-8)
INTEGER INDOS(2,3)
DATA INDOS / 2,3,
1 3,1,
2 1,2 /
*----
* VERIFY IF A BOUNDARY IS REACHED
*----
IDSO=0
LENM=0.0D0
IF(ITYPBC.EQ.0) THEN
* CARTESIAN BOUNDARY
* find corresponding geometry corner corresponding to travel direction
* check if a boundary is reached and if so, which one it is
IDS=0
LENM=LENGTH
DO IDIR=1,NDIM
IF(VDIR(IDIR).GT.EPS) THEN
ODIR(IDIR)=1
IBCO(IDIR)=2
VCOR(IDIR)=XYZL(2,IDIR)-POS(IDIR)
LEN=VCOR(IDIR)/VDIR(IDIR)
IF(LEN.LT.LENM) THEN
LENM=LEN
IDS=IDIR
IF(IDIR.EQ.1) THEN
IREG=-2 ;
ELSEIF(IDIR.EQ.2) THEN
IREG=-4 ;
ELSEIF(IDIR.EQ.3) THEN
IREG=-6 ;
ENDIF
ENDIF
ELSEIF(VDIR(IDIR).LT.-EPS) THEN
ODIR(IDIR)=-1
IBCO(IDIR)=1
VCOR(IDIR)=XYZL(1,IDIR)-POS(IDIR)
LEN=VCOR(IDIR)/VDIR(IDIR)
IF(LEN.LT.LENM) THEN
LENM=LEN
IDS=IDIR
IF(IDIR.EQ.1) THEN
IREG=-1 ;
ELSEIF(IDIR.EQ.2) THEN
IREG=-3 ;
ELSEIF(IDIR.EQ.3) THEN
IREG=-5 ;
ENDIF
ENDIF
ELSE
ODIR(IDIR)=0
ENDIF
ENDDO
ELSE
* CYLINDRICAL BOUNDARY
CALL XABORT('MCTPTR: CYLINDRICAL/HEXAGONAL BOUNDARY NOT IMPLEM'
1 //'ENTED YET.')
ENDIF
IF(IDS.EQ.0) THEN
*----
* NO: LOCATE POINT WITHIN THE GEOMETRY
*----
DO IDIR=1,NDIM
POS(IDIR)=POS(IDIR)+LENGTH*VDIR(IDIR)
ENDDO
DO IDIR=NDIM+1,3
POS(IDIR)=1.D0
ENDDO
!!!!!! for the time being it is the same routine as for a starting point
!!!!!! an optimized version should use the info of the previous point
!!!!!! to start its search
CALL MCTCTR(IPTRK,IPRINT,NDIM,MAXMSH,NUCELL,MXGSUR,MXGREG,
1 MAXPIN,IUNFLD,DGMESH,NBIND,ODIR,POS,IREG,INDX,IDIRC,MESHC,
2 NSURC,NREGC,NTPIN,CELLPO,PINCEN,INDEX,IDREG,DCMESH,ITPIN,
3 DRAPIN)
ELSE
*----
* YES: LOCATE POINT ON THE BOUNDARY
*----
POS(IDS)=XYZL(IBCO(IDS),IDS)
DO JJ=1,2
IDIR=INDOS(JJ,IDS)
POS(IDIR)=POS(IDIR)+LENM*VDIR(IDIR)
ENDDO
LENGTH=LENGTH-LENM
IDSO=IDS
IF(IBCO(IDS).EQ.1) IDSO=-IDSO
ENDIF
*
RETURN
END
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