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#!/bin/csh -f |
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# RCSid: $Id: genbackg.csh,v 2.1 2003/02/22 02:07:23 greg Exp $ |
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# |
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# Generate height field to surround a mesh with an irregular border |
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# |
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# 4/16/2002 Greg Ward |
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# |
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if ( $#argv < 3 ) goto userr |
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# Get arguments |
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set mat = $1 |
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set nam = $2 |
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set mesh = $3 |
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# Get options |
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set smooth="" |
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set i = 4 |
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while ( $i <= $#argv ) |
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switch ($argv[$i]) |
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case -c: |
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@ i++ ; set a=$i |
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@ i++ ; set b=$i |
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@ i++ ; set c=$i |
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set c00=($argv[$a] $argv[$b] $argv[$c]) |
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@ i++ ; set a=$i |
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@ i++ ; set b=$i |
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@ i++ ; set c=$i |
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set c01=($argv[$a] $argv[$b] $argv[$c]) |
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@ i++ ; set a=$i |
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@ i++ ; set b=$i |
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@ i++ ; set c=$i |
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set c11=($argv[$a] $argv[$b] $argv[$c]) |
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@ i++ ; set a=$i |
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@ i++ ; set b=$i |
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@ i++ ; set c=$i |
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set c10=($argv[$a] $argv[$b] $argv[$c]) |
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unset a b c |
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breaksw |
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case -r: |
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@ i++ |
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set step = $argv[$i] |
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breaksw |
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case -b: |
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@ i++ |
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set bord = $argv[$i] |
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breaksw |
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case -s: |
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set smooth="-s" |
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breaksw |
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default: |
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goto userr |
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endsw |
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@ i++ |
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end |
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# Get corner points |
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set lim=(`getbbox -h $mesh`) |
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if (! $?bord ) then |
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set bord=`ev "($lim[2]-$lim[1]+$lim[4]-$lim[3])/20"` |
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endif |
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if (! $?c00 ) then |
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set c00=(`ev "$lim[1]-$bord" "$lim[3]-$bord" "($lim[5]+$lim[6])/2"`) |
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set c01=(`ev "$lim[2]+$bord" "$lim[3]-$bord" "($lim[5]+$lim[6])/2"`) |
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set c10=(`ev "$lim[1]-$bord" "$lim[4]+$bord" "($lim[5]+$lim[6])/2"`) |
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set c11=(`ev "$lim[2]+$bord" "$lim[4]+$bord" "($lim[5]+$lim[6])/2"`) |
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endif |
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# Get mesh resolution |
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if (! $?step ) then |
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set step=`ev "sqrt(($c11[1]-$c00[1])*($c11[1]-$c00[1])+($c11[2]-$c00[2])*($c11[2]-$c00[2]))/70"` |
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endif |
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set res=(`ev "ceil(sqrt(($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)"`) |
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set edgef=`mktemp /tmp/edgerad.XXXXXX` |
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cat > $edgef << _EOF_ |
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void sphere c00 |
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0 0 4 |
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$c00 .001 |
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void sphere c01 |
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0 0 4 |
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$c01 .001 |
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void sphere c10 |
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0 0 4 |
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$c10 .001 |
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void sphere c11 |
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0 0 4 |
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$c11 .001 |
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void cylinder ex0 |
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0 0 7 |
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$c00 $c10 .001 |
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void cylinder ex1 |
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0 0 7 |
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$c01 $c11 .001 |
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void cylinder ey0 |
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0 0 7 |
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$c00 $c01 .001 |
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void cylinder ey1 |
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0 0 7 |
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$c10 $c11 .001 |
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_EOF_ |
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set meshcal=`mkdir /tmp/meshcal.XXXXXX` |
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cat > $meshcal << _EOF_ |
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lerp(x,y0,y1):(1-x)*y0+x*y1; |
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and(a,b):if(a,b,-1); |
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or(a,b):if(a,1,b); |
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not(a):if(a,-1,1); |
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max(a,b):if(a-b,a,b); |
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min(a,b):if(a-b,b,a); |
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EPS:1e-7; |
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XR:min(32,floor($res[1]/2)); |
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YR:8; |
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eq(a,b):and(a-b+EPS,b-a+EPS); |
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sumfun2x(f,y,x0,x1):if(x1-x0+EPS,f(x0,y)+sumfun2x(f,y,x0+1,x1),0); |
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sumfun2(f,x0,x1,y0,y1):if(y1-y0+EPS, |
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sumfun2x(f,y0,x0,x1)+sumfun2(f,x0,x1,y0+1,y1), 0); |
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xpos(xf,yf)=lerp(xf,lerp(yf,$c00[1],$c10[1]),lerp(yf,$c01[1],$c11[1])); |
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ypos(xf,yf)=lerp(xf,lerp(yf,$c00[2],$c10[2]),lerp(yf,$c01[2],$c11[2])); |
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onedge=or(or(eq(x,0),eq(x,xmax-1)),or(eq(y,0),eq(y,ymax-1))); |
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z0:$lim[5]-$bord; |
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height(xo,yo)=z0+gi(1,xo,yo); |
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maxwt(xo,yo):if(and(eq(xo,0),eq(yo,0)),100,1/(xo*xo+yo*yo)); |
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wt(xo,yo)=if(height(xo,yo)-1e9, 0, maxwt(xo,yo)); |
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wtv(xo,yo)=wt(xo,yo)*height(xo,yo); |
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wts=sumfun2(wt,-XR,XR,-YR,YR); |
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sum=sumfun2(wtv,-XR,XR,-YR,YR); |
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inmesh=and(not(onedge),eq(sumfun2(wt,-1,1,-1,1),sumfun2(maxwt,-1,1,-1,1))); |
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lo=if(inmesh,1e10,if(wts-EPS,sum/wts,($lim[5]+$lim[6])/2)); |
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_EOF_ |
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# Generate height image |
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set meshoct=`/tmp/meshoct.XXXXXXX` |
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xform -m void $mesh | oconv - $edgef > $meshoct |
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set meshpic=`mktemp /tmp/meshpic.XXXXXX` |
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cnt $res[2] $res[1] \ |
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| rcalc -e 'sp=$2/'"($res[1]-1)" -e 'tp=1-$1/'"($res[2]-1)" \ |
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-f $meshcal -e "xp=xpos(sp,tp);yp=ypos(sp,tp)" \ |
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-e '$1=xp;$2=yp;$3=z0;$4=0;$5=0;$6=1' \ |
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| rtrace -w -faf -oL -x $res[1] -y $res[2] $meshoct \ |
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| pvalue -r -b -df > $meshpic |
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rm $edgef $meshoct |
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# Output mesh surround |
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cat << _EOF_ |
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# $0 $argv[*] |
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# Corner points: |
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# $c00 |
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# $c01 |
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# $c11 |
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# $c10 |
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_EOF_ |
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pflip -v $meshpic \ |
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| pcomb -f $meshcal - \ |
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| pvalue -h -H -pG -d \ |
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| gensurf $mat $nam 'xpos(s,t)' 'ypos(s,t)' - \ |
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`ev $res[1]-1 $res[2]-1` \ |
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-e 'valid(xf,yf)=1e9-Z`SYS(xf,yf)' \ |
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-f $meshcal $smooth |
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rm $meshcal $meshpic |
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# All done -- exit |
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exit 0 |
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# Usage error message |
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userr: |
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echo Usage: $0 "mat name mesh_file [-c corners][-b bord_width][-r step_size][-s]" |
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exit 1 |
