87 lines
2.2 KiB
Perl
87 lines
2.2 KiB
Perl
package Slic3r::STL;
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use Moo;
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use Math::Clipper qw(integerize_coordinate_sets is_counter_clockwise);
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use Slic3r::Geometry qw(X Y Z three_points_aligned longest_segment);
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use XXX;
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sub read_file {
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my $self = shift;
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my ($file) = @_;
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open my $fh, '<', $file or die "Failed to open $file\n";
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my $facets = [];
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# let's detect whether file is ASCII or binary
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my $mode;
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{
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my $size = +(stat $fh)[7];
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$mode = 'ascii' if $size < 80 + 4;
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# skip binary header
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seek $fh, 80, 0;
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read $fh, my $buf, 4;
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my $triangle_count = unpack 'L', $buf;
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die "STL file seems invalid, could not read facet count\n" if !defined $triangle_count;
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my $expected_size =
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+ 80 # header
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+ 4 # count
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+ $triangle_count * (
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+ 4 # normal, pt,pt,pt (vectors)
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* 4 # bytes per value
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* 3 # values per vector
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+ 2 # the trailing 'short'
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);
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$mode = ($size == $expected_size) ? 'binary' : 'ascii';
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}
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$mode eq 'ascii'
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? _read_ascii($fh, $facets)
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: _read_binary($fh, $facets);
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close $fh;
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return Slic3r::TriangleMesh->new(facets => $facets);
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}
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sub _read_ascii {
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my ($fh, $facets) = @_;
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my $point_re = qr/([^ ]+)\s+([^ ]+)\s+([^ ]+)\s*$/;
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my $facet;
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seek $fh, 0, 0;
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while (<$fh>) {
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chomp;
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if (!$facet) {
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/^\s*facet\s+normal\s+$point_re/ or next;
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$facet = [ [$1, $2, $3] ];
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} else {
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if (/^\s*endfacet/) {
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push @$facets, $facet;
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undef $facet;
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} else {
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/^\s*vertex\s+$point_re/ or next;
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push @$facet, [$1, $2, $3];
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}
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}
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}
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if ($facet) {
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die "STL file seems invalid\n";
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}
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}
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sub _read_binary {
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my ($fh, $facets) = @_;
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die "bigfloat" unless length(pack "f", 1) == 4;
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binmode $fh;
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seek $fh, 80 + 4, 0;
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while (read $fh, $_, 4*4*3+2) {
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my @v = unpack '(f<3)4';
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push @$facets, [ [@v[0..2]], [@v[3..5]], [@v[6..8]], [@v[9..11]] ];
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}
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}
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1;
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