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greg |
2.1 |
#!/bin/csh -f
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# RCSid: $Id$
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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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cat > /tmp/edge$$.rad << _EOF_
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void sphere c00
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0 0 4
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$c00 .001
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void sphere c01
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0 0 4
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$c01 .001
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void sphere c10
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0 0 4
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$c10 .001
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void sphere c11
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0 0 4
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$c11 .001
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void cylinder ex0
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0 0 7
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$c00 $c10 .001
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void cylinder ex1
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0 0 7
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$c01 $c11 .001
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void cylinder ey0
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0 0 7
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$c00 $c01 .001
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void cylinder ey1
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0 0 7
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$c10 $c11 .001
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_EOF_
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cat > /tmp/mesh$$.cal << _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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xform -m void $mesh | oconv - /tmp/edge$$.rad > /tmp/mesh$$.oct
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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 /tmp/mesh$$.cal -e "xp=xpos(sp,tp);yp=ypos(sp,tp)" \
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-e '$1=xp;$2=yp;$3=z0;$4=0;$5=0;$6=1' \
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| rtrace -w -faf -oL -x $res[1] -y $res[2] /tmp/mesh$$.oct \
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| pvalue -r -b -df > /tmp/mesh$$.pic
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rm /tmp/edge$$.rad /tmp/mesh$$.oct
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# Output mesh surround
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cat << _EOF_
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# $0 $argv[*]
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# Corner points:
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# $c00
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# $c01
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# $c11
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# $c10
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_EOF_
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pflip -v /tmp/mesh$$.pic \
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| pcomb -f /tmp/mesh$$.cal - \
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| pvalue -h -H -pG -d \
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| gensurf $mat $nam 'xpos(s,t)' 'ypos(s,t)' - \
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`ev $res[1]-1 $res[2]-1` \
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-e 'valid(xf,yf)=1e9-Z`SYS(xf,yf)' \
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-f /tmp/mesh$$.cal $smooth
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rm /tmp/mesh$$.cal /tmp/mesh$$.pic
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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
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