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package Slic3r::STL;
use Moo;
use Math::Clipper qw(integerize_coordinate_sets is_counter_clockwise);
use Slic3r::Geometry qw(X Y Z three_points_aligned longest_segment);
use XXX;
sub read_file {
my $self = shift;
my ($file) = @_;
open my $fh, '<', $file or die "Failed to open $file\n";
my $facets = [];
# let's detect whether file is ASCII or binary
my $mode;
{
my $size = +(stat $fh)[7];
$mode = 'ascii' if $size < 80 + 4;
# skip binary header
seek $fh, 80, 0;
read $fh, my $buf, 4;
my $triangle_count = unpack 'L', $buf;
my $expected_size =
+ 80 # header
+ 4 # count
+ $triangle_count * (
+ 4 # normal, pt,pt,pt (vectors)
* 4 # bytes per value
* 3 # values per vector
+ 2 # the trailing 'short'
);
$mode = ($size == $expected_size) ? 'binary' : 'ascii';
}
$mode eq 'ascii'
? _read_ascii($fh, $facets)
: _read_binary($fh, $facets);
close $fh;
return Slic3r::TriangleMesh->new(facets => $facets);
}
sub _read_ascii {
my ($fh, $facets) = @_;
my $point_re = qr/([^ ]+)\s+([^ ]+)\s+([^ ]+)$/;
my $facet;
seek $fh, 0, 0;
while (<$fh>) {
chomp;
if (!$facet) {
/^\s*facet\s+normal\s+$point_re/ or next;
$facet = [ [$1, $2, $3] ];
} else {
if (/^\s*endfacet/) {
push @$facets, $facet;
undef $facet;
} else {
/^\s*vertex\s+$point_re/ or next;
push @$facet, [$1, $2, $3];
}
}
}
if ($facet) {
die "STL file seems invalid\n";
}
}
sub _read_binary {
my ($fh, $facets) = @_;
die "bigfloat" unless length(pack "f", 1) == 4;
binmode $fh;
seek $fh, 80 + 4, 0;
while (read $fh, $_, 4*4*3+2) {
my @v = unpack '(f<3)4';
push @$facets, [ [@v[0..2]], [@v[3..5]], [@v[6..8]], [@v[9..11]] ];
}
}
1;
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