--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/orig/genbackg.csh Sat Apr 09 17:55:16 2011 +0100
@@ -0,0 +1,157 @@
+#!/bin/csh -f
+# RCSid: $Id: genbackg.csh,v 2.2 2008/08/25 04:50:32 greg Exp $
+#
+# Generate height field to surround a mesh with an irregular border
+#
+# 4/16/2002 Greg Ward
+#
+if ( $#argv < 3 ) goto userr
+# Get arguments
+set mat = $1
+set nam = $2
+set mesh = $3
+# Get options
+set smooth=""
+set i = 4
+while ( $i <= $#argv )
+ switch ($argv[$i])
+ case -c:
+ @ i++ ; set a=$i
+ @ i++ ; set b=$i
+ @ i++ ; set c=$i
+ set c00=($argv[$a] $argv[$b] $argv[$c])
+ @ i++ ; set a=$i
+ @ i++ ; set b=$i
+ @ i++ ; set c=$i
+ set c01=($argv[$a] $argv[$b] $argv[$c])
+ @ i++ ; set a=$i
+ @ i++ ; set b=$i
+ @ i++ ; set c=$i
+ set c11=($argv[$a] $argv[$b] $argv[$c])
+ @ i++ ; set a=$i
+ @ i++ ; set b=$i
+ @ i++ ; set c=$i
+ set c10=($argv[$a] $argv[$b] $argv[$c])
+ unset a b c
+ breaksw
+ case -r:
+ @ i++
+ set step = $argv[$i]
+ breaksw
+ case -b:
+ @ i++
+ set bord = $argv[$i]
+ breaksw
+ case -s:
+ set smooth="-s"
+ breaksw
+ default:
+ goto userr
+ endsw
+ @ i++
+end
+# Get corner points
+set lim=(`getbbox -h $mesh`)
+if (! $?bord ) then
+ set bord=`ev "($lim[2]-$lim[1]+$lim[4]-$lim[3])/20"`
+endif
+if (! $?c00 ) then
+ set c00=(`ev "$lim[1]-$bord" "$lim[3]-$bord" "($lim[5]+$lim[6])/2"`)
+ set c01=(`ev "$lim[2]+$bord" "$lim[3]-$bord" "($lim[5]+$lim[6])/2"`)
+ set c10=(`ev "$lim[1]-$bord" "$lim[4]+$bord" "($lim[5]+$lim[6])/2"`)
+ set c11=(`ev "$lim[2]+$bord" "$lim[4]+$bord" "($lim[5]+$lim[6])/2"`)
+endif
+# Get mesh resolution
+if (! $?step ) then
+ set step=`ev "sqrt(($c11[1]-$c00[1])*($c11[1]-$c00[1])+($c11[2]-$c00[2])*($c11[2]-$c00[2]))/70"`
+endif
+set res=(`ev "ceil(sqrt(($c01[1]-$c00[1])*($c01[1]-$c00[1])+($c01[2]-$c00[2])*($c01[2]-$c00[2]))/$step)" "ceil(sqrt(($c10[1]-$c00[1])*($c10[1]-$c00[1])+($c10[2]-$c00[2])*($c10[2]-$c00[2]))/$step)"`)
+set edgef=`mktemp /tmp/edgerad.XXXXXX`
+cat > $edgef << _EOF_
+void sphere c00
+0 0 4
+$c00 .001
+void sphere c01
+0 0 4
+$c01 .001
+void sphere c10
+0 0 4
+$c10 .001
+void sphere c11
+0 0 4
+$c11 .001
+void cylinder ex0
+0 0 7
+$c00 $c10 .001
+void cylinder ex1
+0 0 7
+$c01 $c11 .001
+void cylinder ey0
+0 0 7
+$c00 $c01 .001
+void cylinder ey1
+0 0 7
+$c10 $c11 .001
+_EOF_
+set meshcal=`mkdir /tmp/meshcal.XXXXXX`
+cat > $meshcal << _EOF_
+lerp(x,y0,y1):(1-x)*y0+x*y1;
+and(a,b):if(a,b,-1);
+or(a,b):if(a,1,b);
+not(a):if(a,-1,1);
+max(a,b):if(a-b,a,b);
+min(a,b):if(a-b,b,a);
+EPS:1e-7;
+XR:min(32,floor($res[1]/2));
+YR:8;
+eq(a,b):and(a-b+EPS,b-a+EPS);
+sumfun2x(f,y,x0,x1):if(x1-x0+EPS,f(x0,y)+sumfun2x(f,y,x0+1,x1),0);
+sumfun2(f,x0,x1,y0,y1):if(y1-y0+EPS,
+ sumfun2x(f,y0,x0,x1)+sumfun2(f,x0,x1,y0+1,y1), 0);
+xpos(xf,yf)=lerp(xf,lerp(yf,$c00[1],$c10[1]),lerp(yf,$c01[1],$c11[1]));
+ypos(xf,yf)=lerp(xf,lerp(yf,$c00[2],$c10[2]),lerp(yf,$c01[2],$c11[2]));
+onedge=or(or(eq(x,0),eq(x,xmax-1)),or(eq(y,0),eq(y,ymax-1)));
+z0:$lim[5]-$bord;
+height(xo,yo)=z0+gi(1,xo,yo);
+maxwt(xo,yo):if(and(eq(xo,0),eq(yo,0)),100,1/(xo*xo+yo*yo));
+wt(xo,yo)=if(height(xo,yo)-1e9, 0, maxwt(xo,yo));
+wtv(xo,yo)=wt(xo,yo)*height(xo,yo);
+wts=sumfun2(wt,-XR,XR,-YR,YR);
+sum=sumfun2(wtv,-XR,XR,-YR,YR);
+inmesh=and(not(onedge),eq(sumfun2(wt,-1,1,-1,1),sumfun2(maxwt,-1,1,-1,1)));
+lo=if(inmesh,1e10,if(wts-EPS,sum/wts,($lim[5]+$lim[6])/2));
+_EOF_
+# Generate height image
+set meshoct=`/tmp/meshoct.XXXXXXX`
+xform -m void $mesh | oconv - $edgef > $meshoct
+set meshpic=`mktemp /tmp/meshpic.XXXXXX`
+cnt $res[2] $res[1] \
+ | rcalc -e 'sp=$2/'"($res[1]-1)" -e 'tp=1-$1/'"($res[2]-1)" \
+ -f $meshcal -e "xp=xpos(sp,tp);yp=ypos(sp,tp)" \
+ -e '$1=xp;$2=yp;$3=z0;$4=0;$5=0;$6=1' \
+ | rtrace -w -faf -oL -x $res[1] -y $res[2] $meshoct \
+ | pvalue -r -b -df > $meshpic
+rm $edgef $meshoct
+# Output mesh surround
+cat << _EOF_
+# $0 $argv[*]
+# Corner points:
+# $c00
+# $c01
+# $c11
+# $c10
+_EOF_
+pflip -v $meshpic \
+ | pcomb -f $meshcal - \
+ | pvalue -h -H -pG -d \
+ | gensurf $mat $nam 'xpos(s,t)' 'ypos(s,t)' - \
+ `ev $res[1]-1 $res[2]-1` \
+ -e 'valid(xf,yf)=1e9-Z`SYS(xf,yf)' \
+ -f $meshcal $smooth
+rm $meshcal $meshpic
+# All done -- exit
+exit 0
+# Usage error message
+userr:
+echo Usage: $0 "mat name mesh_file [-c corners][-b bord_width][-r step_size][-s]"
+exit 1