C ++********************************************************************
C                                                                      *
C  PREPCUB_S.F                                                                   *
C                                                                      *
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2005  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program is free software; you can redistribute it and/or      *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* This program is distributed in the hope that it will be useful,    *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
C=* General Public License for more details.                           *
C=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C                                                                      *
C                                                                      *
C                                                                      *
C  PURPOSE:                                                            *
C                                                                      *
C  PARAMETERS:                                                         *
C
C IMAGE_PROCESSING_ROUTINE                                             *
C
C        0         2         3         4         5         6         7 *
C23456789012345678901234567890123456789012345678901234567890123456789012
C***********************************************************************

        SUBROUTINE  PREPCUB_S(N,NN,IPCUBE,RI,MD)

        INTEGER  IPCUBE(5,NN)
        LOGICAL  FIRST,MD
        COMMON /PAR/  LDP,NM,LDPNM

C
C IPCUBE: 1 - beginning
C         2 - length
C         3 - ix
C         4 - iy
C         5 - iz
C
        R=RI*RI
C
        NMAT=0
        NN=0
C
        DO    I1=1,N
           T=I1-LDP
           XX=T*T
           DO    I2=1,N
              T=I2-LDP
              YY=T*T+XX
              FIRST=.TRUE.
              DO    I3=1,N
                 NMAT=NMAT+1
                 T=I3-LDP
                 RC=T*T+YY
                 IF(FIRST)  THEN
                    IF(RC-R)  80  ,80,14
80                  FIRST=.FALSE.
                    NN=NN+1
                    IF (MD) THEN
                       IPCUBE(1,NN)=NMAT
                       IPCUBE(2,NN)=NMAT
                       IPCUBE(3,NN)=I3
                       IPCUBE(4,NN)=I2
                       IPCUBE(5,NN)=I1 
                   ENDIF


                 ELSE

                    IF (MD) THEN
                       IF(RC.LE.R)  IPCUBE(2,NN)=NMAT
                    ENDIF

                 ENDIF
14                  CONTINUE
              ENDDO
16      CONTINUE
           ENDDO
        ENDDO
        END