X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=distort-stl;h=39e5a150512c339c38a7a635194194a95b886bce;hp=eb3a7a15deb92a6c393b45fd3db21f63426cab00;hb=1d7ee4585cc01e847229d7ebd5868a95ae33652f;hpb=0b7257ca44cddaf016c96b1998fe34b99d1701b6

diff --git a/distort-stl b/distort-stl
index eb3a7a1..39e5a15 100755
--- a/distort-stl
+++ b/distort-stl
@@ -25,58 +25,81 @@
 use strict;
 use autodie;
 
-use File::Temp;
 use List::Util;
+use POSIX;
+use File::Temp ();
+use Data::Dumper;
+
+sub TAU () { M_PI * 2; }
 
 our $fa = 10;
 
-our @triangles;
+our $triangles;
+our $output;
 
 sub shift_arg () {
     die unless @ARGV;
     scalar shift @ARGV;
 }
 
+#no warnings qw(recursion);
+
 sub subdivide_triangle ($$) {
-    my ($it, $fn) = @_;
+    my ($t, $fn) = @_;
+
+    #print STDERR 'SUBDIV', Dumper($t, $fn);
+
     my @mids;
     foreach my $ix (0..2) {
 	my $jx = ($ix+1) % 3;
 	my @midp;
 	foreach my $ci (0..2) {
-	    push @midp, 0.5 * ($it->[$ix][$ci] + $it->[$jx][$ci]);
+	    push @midp, 0.5 * ($t->[$ix][$ci] + $t->[$jx][$ci]);
 	}
-	push @mids, @midp;
+	push @mids, \@midp;
     }
     foreach my $ix (0..2) {
+	#print STDERR 'SUBDIV IX ', $ix, "\n";
 	my $kx = ($ix+2) % 3;
-	$fn->([ $it->[$ix], $mids[$ix], $it->[$kx] ]);
+	$fn->([ $t->[$ix], $mids[$ix], $mids[$kx] ]);
     }
+    #print STDERR 'SUBDIV MID\n';
     $fn->(\@mids);
 }
 
+sub append_triangle ($) {
+    my ($t) = @_;
+    push @$output, $t;
+}
+
 #---------- project-cylinder ----------
 
 our $project_cylinder_radius;
 our $project_cylinder_max_d_theta;
 
-sub project_cylinder_tri {
-    my ($it) = @_;
-
-    my $radius = project_cylinder_radius;
-
-    my @thetas = map { $_->[0] / $radius } @$it;
+sub project_cylinder_need_subdivide () {
+    foreach my $t (@$triangles) {
+	my @thetas = map { $_->[0] / $project_cylinder_radius } @$t;
 
-    foreach my $ix (0..2) {
-	if (abs($thetas[$ix] - $thetas[($ix+1)%3])
-	    > $project_cylinder_max_d_theta) {
-	    subdivide_triangle $it, \&project_cylinder_tri;
-	    return;
+	foreach my $ix (0..2) {
+	    if (abs($thetas[$ix] - $thetas[($ix+1)%3])
+		> $project_cylinder_max_d_theta) {
+		return 1;
+	    }
 	}
     }
+    return 0;
+}
+
+sub project_cylinder_tri {
+    my ($t) = @_;
+
+    #print STDERR 'PROJECT', Dumper($t);
+
+    my $radius = $project_cylinder_radius;
 
     my @ot;
-    foreach my $p (@it) {
+    foreach my $p (@$t) {
 	my ($x,$y,$z) = @$p;
 	my $r = $radius - $y;
 	my $theta = $x / $radius;
@@ -84,50 +107,77 @@ sub project_cylinder_tri {
 		    -$r * cos($theta),
 		    $z ];
     }
-    push @triangles, \@ot;
+    append_triangle \@ot;
 }
 
 sub op__project_cylinder () {
     $project_cylinder_radius = shift_arg;
     $project_cylinder_max_d_theta = $fa * TAU/360;
 
-    my @input = (@triangles);
-    @triangles = ();
+    while (project_cylinder_need_subdivide()) {
+	$output = [];
+	foreach my $t (@$triangles) {
+	    subdivide_triangle $t, \&append_triangle;
+	}
+	$triangles = $output;
+    }
 
-    project_cylinder_tri $_ foreach @input;
+    $output = [];
+    foreach my $t (@$triangles) {
+	project_cylinder_tri $t;
+    }
+    $triangles = $output;
 }
 
 #---------- main program ----------
 
-if (@ARGV && $ARGV[0] =~ m/^-/) {
-    die "no options supported\n";
-}
+our $raw;
 
-my $itmp = new File::Temp;
-my $otmp = new File::Temp;
+while (@ARGV && $ARGV[0] =~ m/^-/) {
+    $_ = shift @ARGV;
+    last if m/^--$/;
+    if (s/^--raw$//) {
+	$raw = 1;
+    } else {
+	die "$_ ?";
+    }
+}
 
-system "cat >$itmp";
+my $itmp;
+my $otmp;
 
 my $admesh_stdout = '--write-ascii-stl /dev/fd/3 3>&1 >/dev/null';
 
-open I, "admesh $admesh_stdout $itmp |";
+if ($raw) {
+    open I, "<& STDIN";
+    $otmp = *STDOUT;
+} else {
+    $itmp = new File::Temp;
+    $otmp = new File::Temp;
+
+    system "cat >$itmp";
+
+    open I, "admesh $admesh_stdout $itmp |";
+}
 
 my $triangle;
 
 while (<I>) {
-    if (m/^\s+outer\s+loop/) {
+    s/^\s*//;
+    if (m/^outer\s+loop/) {
 	die if $triangle;
 	$triangle = [];
-    } elsif (s/^\s+vertex\s+//) {
+    } elsif (s/^vertex\s+//) {
 	my $lhs = $&;
 	s/\s+$//;
 	my @xyz = split /\s+/, $_;
 	die unless $triangle;
-	push @$triangle, \@xya;
-    } elsif (m/^\s+endloop/) {
+	push @$triangle, \@xyz;
+    } elsif (m/^endloop/) {
 	die unless @$triangle == 3;
-	push @triangles, $triangle;
-    } elsif (m/^\s+(?:solid|facet\s+normal|endfacet|endsolid)\s/) {
+	push @$triangles, $triangle;
+	undef $triangle;
+    } elsif (m/^(?:solid|facet\s+normal|endfacet|endsolid)\s/) {
     } else {
 	die "$_ ?";
     }
@@ -146,12 +196,16 @@ select $otmp;
 
 print "solid distort-stl\n";
 
-foreach my $t (@triangles) {
+foreach my $t (@$triangles) {
     print "  facet normal 0 0 0\n";
     print "    outer loop\n";
-    print "      vertex";
-    printf " %.18g", $_ foreach @$t;
-    print "\n";
+    die unless @$t==3;
+    foreach my $p (@$t) {
+	die unless @$p==3;
+	print "      vertex";
+	printf " %.18g", $_ foreach @$p;
+	print "\n";
+    }
     print "    endloop\n";
     print "  endfacet\n";
 }
@@ -160,4 +214,6 @@ print "endsolid distort-stl\n";
 
 flush $otmp;
 
-system "admesh --normal-values $admesh_stdout $otmp";
+if (!$raw) {
+    system "admesh --normal-values $admesh_stdout $otmp";
+}