sub TAU () { M_PI * 2; }
+my $ps = %ENV{DISTORT_PS};
+if ($ps) {
+ open PS, "> $ps" or die $!;
+ print PS "%!\n";
+}
+
our $fa = 10;
our $triangles;
#no warnings qw(recursion);
+sub sprintf_triangle ($) {
+ my ($t) = @_;
+
+ if ($ps && $t->[3] =~ m/$ENV{DISTORT_PS_RE}/) {
+ printf PS <<'END',
+ %20.16g %20.16g %20.16g moveto
+ %20.16g %20.16g %20.16g lineto
+ %20.16g %20.16g %20.16g lineto
+ closepath stroke
+END
+ $t->[0][0], $t->[0][1], $t->[0][2],
+ $t->[1][0], $t->[1][1], $t->[1][2],
+ $t->[2][0], $t->[2][1], $t->[2][2],
+ or die $!;
+ flush PS or die $!;
+ }
+
+ sprintf
+ "%11.6f,%11.6f,%11.6f / ".
+ "%11.6f,%11.6f,%11.6f / ".
+ "%11.6f,%11.6f,%11.6f %-40s ",
+ $t->[0][0], $t->[0][1], $t->[0][2],
+ $t->[1][0], $t->[1][1], $t->[1][2],
+ $t->[2][0], $t->[2][1], $t->[2][2],
+ $t->[3];
+}
+
sub maybe_subdivide_triangle ($$$$) {
my ($t, $ok, $changed, $edge_need_subdivide_fn) = @_;
+
+ print STDERR sprintf_triangle $t;
foreach my $ix (0..2) {
my $jx = ($ix+1) % 3;
my $kx = ($ix+2) % 3;
if ($edge_need_subdivide_fn->($t->[$ix], $t->[$jx])) {
+ printf STDERR
+ " S i=%d j=%d k=%d ",
+ $ix, $jx, $kx;
my @midp;
foreach my $ci (0..2) {
push @midp, 0.5 * ($t->[$ix][$ci] + $t->[$jx][$ci]);
}
+
+ printf STDERR
+ " midp %11.6f,%11.6f,%11.6f\n",
+ @midp;
+
# triangle i-j-k, splitting edge i-m
# gives i-m-k, k-m-j
- push @$changed,
- [ $t->[$ix], \@midp, $t->[$kx] ],
- [ $t->[$kx], \@midp, $t->[$jx] ];
+ my $n = [ @$t ]; $n->[$ix] = \@midp; $n->[3] = "$t->[3]a$ix$jx";
+ unshift @$changed, $n;
+
+ printf STDERR "%s\n", sprintf_triangle $n;
+
+ my $n = [ @$t ]; $n->[$jx] = \@midp; $n->[3] = "$t->[3]b$ix$jx";
+ unshift @$changed, $n;
+
+ printf STDERR "%s\n", sprintf_triangle $n;
+
return;
}
}
push @$ok, $t;
+ printf STDERR "OK nok=%d nchanged=%d\n",
+ (scalar @$ok), (scalar @$changed);
}
sub maybe_subdivide ($) {
push @$triangle, \@xyz;
} elsif (m/^endloop/) {
die unless @$triangle == 3;
+ push @$triangle, $.;
push @$triangles, $triangle;
undef $triangle;
} elsif (m/^(?:solid|facet\s+normal|endfacet|endsolid)\s/) {