mirror of
https://github.com/SoftFever/OrcaSlicer.git
synced 2025-10-31 04:31:15 -06:00
487 lines
18 KiB
Perl
487 lines
18 KiB
Perl
package Slic3r::Layer;
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use Moo;
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use Math::Clipper ':all';
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use Slic3r::Geometry qw(polygon_lines points_coincide angle3points polyline_lines nearest_point
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line_length collinear X Y A B PI);
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use Slic3r::Geometry::Clipper qw(union_ex diff_ex intersection_ex PFT_EVENODD);
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use XXX;
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# a sequential number of layer, starting at 0
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has 'id' => (
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is => 'ro',
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#isa => 'Int',
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required => 1,
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);
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# collection of spare segments generated by slicing the original geometry;
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# these need to be merged in continuos (closed) polylines
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has 'lines' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Line]',
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default => sub { [] },
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);
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# collection of surfaces generated by slicing the original geometry
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has 'surfaces' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Surface]',
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default => sub { [] },
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);
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# ordered collection of extrusion paths to build all perimeters
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has 'perimeters' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::ExtrusionLoop]',
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default => sub { [] },
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);
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# ordered collection of extrusion paths to build skirt loops
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has 'skirts' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::ExtrusionLoop]',
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default => sub { [] },
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);
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# collection of surfaces generated by offsetting the innermost perimeter(s)
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# they represent boundaries of areas to fill
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has 'fill_boundaries' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Surface]',
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default => sub { [] },
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);
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# ordered collection of extrusion paths to fill surfaces
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has 'fills' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::ExtrusionPath]',
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default => sub { [] },
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);
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# Z used for slicing
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sub slice_z {
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my $self = shift;
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if ($self->id == 0) {
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return ($Slic3r::layer_height * $Slic3r::first_layer_height_ratio) / 2 / $Slic3r::resolution;
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}
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return (($Slic3r::layer_height * $Slic3r::first_layer_height_ratio)
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+ (($self->id-1) * $Slic3r::layer_height)
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+ ($Slic3r::layer_height/2)) / $Slic3r::resolution;
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}
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# Z used for printing
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sub print_z {
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my $self = shift;
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return (($Slic3r::layer_height * $Slic3r::first_layer_height_ratio)
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+ ($self->id * $Slic3r::layer_height)) / $Slic3r::resolution;
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}
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sub add_surface {
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my $self = shift;
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my (@vertices) = @_;
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# convert arrayref points to Point objects
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@vertices = map Slic3r::Point->new($_), @vertices;
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my $surface = Slic3r::Surface->new(
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contour => Slic3r::Polyline::Closed->new(points => \@vertices),
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);
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push @{ $self->surfaces }, $surface;
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# make sure our contour has its points in counter-clockwise order
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$surface->contour->make_counter_clockwise;
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return $surface;
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}
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sub add_line {
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my $self = shift;
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my ($line) = @_;
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return if $line->a->coincides_with($line->b);
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push @{ $self->lines }, $line;
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return $line;
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}
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# merge overlapping lines
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sub cleanup_lines {
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my $self = shift;
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my $lines = $self->lines;
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my $line_count = @$lines;
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for (my $i = 0; $i <= $#$lines-1; $i++) {
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for (my $j = $i+1; $j <= $#$lines; $j++) {
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# lines are collinear and overlapping?
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next unless collinear($lines->[$i], $lines->[$j], 1);
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# lines have same orientation?
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next unless ($lines->[$i][A][X] <=> $lines->[$i][B][X]) == ($lines->[$j][A][X] <=> $lines->[$j][B][X])
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&& ($lines->[$i][A][Y] <=> $lines->[$i][B][Y]) == ($lines->[$j][A][Y] <=> $lines->[$j][B][Y]);
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# resulting line
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my @x = sort { $a <=> $b } ($lines->[$i][A][X], $lines->[$i][B][X], $lines->[$j][A][X], $lines->[$j][B][X]);
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my @y = sort { $a <=> $b } ($lines->[$i][A][Y], $lines->[$i][B][Y], $lines->[$j][A][Y], $lines->[$j][B][Y]);
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my $new_line = Slic3r::Line->new([$x[0], $y[0]], [$x[-1], $y[-1]]);
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for (X, Y) {
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($new_line->[A][$_], $new_line->[B][$_]) = ($new_line->[B][$_], $new_line->[A][$_])
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if $lines->[$i][A][$_] > $lines->[$i][B][$_];
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}
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# save new line and remove found one
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$lines->[$i] = $new_line;
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splice @$lines, $j, 1;
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$j--;
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}
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}
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Slic3r::debugf " merging %d lines resulted in %d lines\n", $line_count, scalar(@$lines);
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}
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# build polylines from lines
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sub make_surfaces {
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my $self = shift;
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if (0) {
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printf "Layer was sliced at z = %f\n", $self->slice_z * $Slic3r::resolution;
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require "Slic3r/SVG.pm";
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Slic3r::SVG::output(undef, "lines.svg",
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lines => [ grep !$_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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red_lines => [ grep $_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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);
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}
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my (@polygons, %visited_lines, @discarded_lines, @discarded_polylines) = ();
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my $detect = sub {
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my @lines = @{$self->lines};
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(@polygons, %visited_lines, @discarded_lines, @discarded_polylines) = ();
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my $get_point_id = sub { sprintf "%.0f,%.0f", @{$_[0]} };
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my (%pointmap, @pointmap_keys) = ();
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foreach my $line (@lines) {
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my $point_id = $get_point_id->($line->[A]);
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if (!exists $pointmap{$point_id}) {
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$pointmap{$point_id} = [];
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push @pointmap_keys, $line->[A];
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}
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push @{ $pointmap{$point_id} }, $line;
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}
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my $n = 0;
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while (my $first_line = shift @lines) {
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next if $visited_lines{ $first_line->id };
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my @points = @$first_line;
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my @seen_lines = ($first_line);
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my %seen_points = map { $get_point_id->($points[$_]) => $_ } 0..1;
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CYCLE: while (1) {
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my $next_lines = $pointmap{ $get_point_id->($points[-1]) };
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# shouldn't we find the point, let's try with a slower algorithm
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# as approximation may make the coordinates differ
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if (!$next_lines) {
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my $nearest_point = nearest_point($points[-1], \@pointmap_keys);
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#printf " we have a nearest point: %f,%f (%s)\n", @$nearest_point, $get_point_id->($nearest_point);
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if ($nearest_point) {
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local $Slic3r::Geometry::epsilon = 1000000;
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$next_lines = $pointmap{$get_point_id->($nearest_point)}
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if points_coincide($points[-1], $nearest_point);
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}
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}
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if (0 && !$next_lines) {
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require "Slic3r/SVG.pm";
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Slic3r::SVG::output(undef, "no_lines.svg",
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lines => [ grep !$_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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red_lines => [ grep $_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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points => [ $points[-1] ],
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no_arrows => 1,
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);
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}
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$next_lines
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or die sprintf("No lines start at point %s. This shouldn't happen. Please check the model for manifoldness.\n", $get_point_id->($points[-1]));
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last CYCLE if !@$next_lines;
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my @ordered_next_lines = sort
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{ angle3points($points[-1], $points[-2], $next_lines->[$a][B]) <=> angle3points($points[-1], $points[-2], $next_lines->[$b][B]) }
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0..$#$next_lines;
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#if (@$next_lines > 1) {
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# Slic3r::SVG::output(undef, "next_line.svg",
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# lines => $next_lines,
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# red_lines => [ polyline_lines([@points]) ],
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# green_lines => [ $next_lines->[ $ordered_next_lines[0] ] ],
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# );
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#}
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my ($next_line) = splice @$next_lines, $ordered_next_lines[0], 1;
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push @seen_lines, $next_line;
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push @points, $next_line->[B];
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my $point_id = $get_point_id->($points[-1]);
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if ($seen_points{$point_id}) {
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splice @points, 0, $seen_points{$point_id};
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last CYCLE;
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}
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$seen_points{$point_id} = $#points;
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}
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if (@points < 4 || !points_coincide($points[0], $points[-1])) {
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# discarding polyline
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push @discarded_lines, @seen_lines;
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if (@points > 2) {
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push @discarded_polylines, [@points];
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}
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next;
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}
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$visited_lines{ $_->id } = 1 for @seen_lines;
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pop @points;
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Slic3r::debugf "Discovered polygon of %d points\n", scalar(@points);
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push @polygons, Slic3r::Polygon->new(@points);
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$polygons[-1]->cleanup;
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}
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};
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$detect->();
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# Now, if we got a clean and manifold model then @polygons would contain everything
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# we need to draw our layer. In real life, sadly, things are different and it is likely
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# that the above algorithm wasn't able to detect every polygon. This may happen because
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# of non-manifoldness or because of many close lines, often overlapping; both situations
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# make a head-to-tail search difficult.
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# On the other hand, we can safely assume that every polygon we detected is correct, as
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# the above algorithm is quite strict. We can take a brute force approach to connect any
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# other line.
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# So, let's first check what lines were not detected as part of polygons.
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if (@discarded_lines) {
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Slic3r::debugf " %d lines out of %d were discarded and %d polylines were not closed\n",
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scalar(@discarded_lines), scalar(@{$self->lines}), scalar(@discarded_polylines);
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print " Warning: errors while parsing this layer (dirty or non-manifold model).\n";
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print " Retrying with slower algorithm.\n";
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if (0) {
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require "Slic3r/SVG.pm";
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Slic3r::SVG::output(undef, "layer" . $self->id . "_detected.svg",
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white_polygons => \@polygons,
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);
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Slic3r::SVG::output(undef, "layer" . $self->id . "_discarded_lines.svg",
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red_lines => \@discarded_lines,
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);
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Slic3r::SVG::output(undef, "layer" . $self->id . "_discarded_polylines.svg",
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polylines => \@discarded_polylines,
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);
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}
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$self->cleanup_lines;
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eval { $detect->(); };
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warn $@ if $@;
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if (@discarded_lines) {
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print " Warning: even slow detection algorithm threw errors. Review the output before printing.\n";
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}
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}
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{
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my $expolygons = union_ex([ @polygons ], PFT_EVENODD);
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Slic3r::debugf " %d surface(s) having %d holes detected from %d polylines\n",
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scalar(@$expolygons), scalar(map $_->holes, @$expolygons), scalar(@polygons);
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push @{$self->surfaces},
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map Slic3r::Surface->cast_from_expolygon($_, surface_type => 'internal'),
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@$expolygons;
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}
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#use Slic3r::SVG;
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#Slic3r::SVG::output(undef, "surfaces.svg",
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# polygons => [ map $_->contour->p, @{$self->surfaces} ],
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# red_polygons => [ map $_->p, map @{$_->holes}, @{$self->surfaces} ],
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#);
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}
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sub remove_small_surfaces {
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my $self = shift;
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my @good_surfaces = ();
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my $surface_count = scalar @{$self->surfaces};
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foreach my $surface (@{$self->surfaces}) {
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next if !$surface->contour->is_printable;
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@{$surface->holes} = grep $_->is_printable, @{$surface->holes};
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push @good_surfaces, $surface;
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}
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@{$self->surfaces} = @good_surfaces;
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Slic3r::debugf "removed %d small surfaces at layer %d\n",
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($surface_count - @good_surfaces), $self->id
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if @good_surfaces != $surface_count;
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}
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sub remove_small_perimeters {
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my $self = shift;
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my @good_perimeters = grep $_->is_printable, @{$self->perimeters};
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Slic3r::debugf "removed %d unprintable perimeters at layer %d\n",
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(@{$self->perimeters} - @good_perimeters), $self->id
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if @good_perimeters != @{$self->perimeters};
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@{$self->perimeters} = @good_perimeters;
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}
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# make bridges printable
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sub process_bridges {
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my $self = shift;
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my @bridges = ();
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# a bottom surface on a layer > 0 is either a bridge or a overhang
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# or a combination of both; any top surface is a candidate for
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# reverse bridge processing
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my @solid_surfaces = grep {
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($_->surface_type eq 'bottom' && $self->id > 0) || $_->surface_type eq 'top'
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} @{$self->surfaces} or return;
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my @internal_surfaces = grep $_->surface_type =~ /internal/, @{$self->surfaces};
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SURFACE: foreach my $surface (@solid_surfaces) {
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my $expolygon = $surface->expolygon->safety_offset;
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my $description = $surface->surface_type eq 'bottom' ? 'bridge/overhang' : 'reverse bridge';
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# offset the contour and intersect it with the internal surfaces to discover
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# which of them has contact with our bridge
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my @supporting_surfaces = ();
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my ($contour_offset) = $expolygon->contour->offset($Slic3r::flow_width / $Slic3r::resolution);
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foreach my $internal_surface (@internal_surfaces) {
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my $intersection = intersection_ex([$contour_offset], [$internal_surface->contour->p]);
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if (@$intersection) {
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push @supporting_surfaces, $internal_surface;
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}
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}
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#use Slic3r::SVG;
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#Slic3r::SVG::output(undef, "bridge.svg",
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# green_polygons => [ map $_->p, @supporting_surfaces ],
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# red_polygons => [ @$expolygon ],
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#);
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next SURFACE unless @supporting_surfaces;
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Slic3r::debugf " Found $description on layer %d with %d support(s)\n",
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$self->id, scalar(@supporting_surfaces);
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my $bridge_angle = undef;
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if ($surface->surface_type eq 'bottom') {
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# detect optimal bridge angle
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my $bridge_over_hole = 0;
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my @edges = (); # edges are POLYLINES
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foreach my $supporting_surface (@supporting_surfaces) {
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my @surface_edges = $supporting_surface->contour->clip_with_polygon($contour_offset);
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if (@surface_edges == 1 && @{$supporting_surface->contour->p} == @{$surface_edges[0]->p}) {
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$bridge_over_hole = 1;
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} else {
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foreach my $edge (@surface_edges) {
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shift @{$edge->points};
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pop @{$edge->points};
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}
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@surface_edges = grep { @{$_->points} } @surface_edges;
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}
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push @edges, @surface_edges;
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}
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Slic3r::debugf " Bridge is supported on %d edge(s)\n", scalar(@edges);
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Slic3r::debugf " and covers a hole\n" if $bridge_over_hole;
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if (0) {
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require "Slic3r/SVG.pm";
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Slic3r::SVG::output(undef, "bridge.svg",
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polylines => [ map $_->p, @edges ],
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);
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}
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if (@edges == 2) {
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my @chords = map Slic3r::Line->new($_->points->[0], $_->points->[-1]), @edges;
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my @midpoints = map $_->midpoint, @chords;
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$bridge_angle = -Slic3r::Geometry::rad2deg(Slic3r::Geometry::line_atan(\@midpoints) + PI/2);
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Slic3r::debugf "Optimal infill angle of bridge on layer %d is %d degrees\n", $self->id, $bridge_angle;
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}
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}
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# now, extend our bridge by taking a portion of supporting surfaces
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{
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# offset the bridge by the specified amount of mm (minimum 3)
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my $bridge_overlap = 3 / $Slic3r::resolution;
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my ($bridge_offset) = $expolygon->contour->offset($bridge_overlap, $Slic3r::resolution * 100, JT_MITER, 2);
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# calculate the new bridge
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my $intersection = intersection_ex(
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[ @$expolygon, map $_->p, @supporting_surfaces ],
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[ $bridge_offset ],
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);
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push @bridges, map Slic3r::Surface->cast_from_expolygon($_,
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surface_type => $surface->surface_type,
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bridge_angle => $bridge_angle,
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), @$intersection;
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}
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}
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# now we need to merge bridges to avoid overlapping
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{
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# build a list of unique bridge types
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my @surface_groups = Slic3r::Surface->group(@bridges);
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# merge bridges of the same type, removing any of the bridges already merged;
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# the order of @surface_groups determines the priority between bridges having
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# different surface_type or bridge_angle
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@bridges = ();
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foreach my $surfaces (@surface_groups) {
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my $union = union_ex([ map $_->p, @$surfaces ]);
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my $diff = diff_ex(
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[ map @$_, @$union ],
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[ map $_->p, @bridges ],
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);
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push @bridges, map Slic3r::Surface->cast_from_expolygon($_,
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surface_type => $surfaces->[0]->surface_type,
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bridge_angle => $surfaces->[0]->bridge_angle,
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), @$union;
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}
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}
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# apply bridges to layer
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{
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my @surfaces = @{$self->surfaces};
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@{$self->surfaces} = ();
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# intersect layer surfaces with bridges to get actual bridges
|
|
foreach my $bridge (@bridges) {
|
|
my $actual_bridge = intersection_ex(
|
|
[ map $_->p, @surfaces ],
|
|
[ $bridge->p ],
|
|
);
|
|
|
|
push @{$self->surfaces}, map Slic3r::Surface->cast_from_expolygon($_,
|
|
surface_type => $bridge->surface_type,
|
|
bridge_angle => $bridge->bridge_angle,
|
|
), @$actual_bridge;
|
|
}
|
|
|
|
# difference between layer surfaces and bridges are the other surfaces
|
|
foreach my $group (Slic3r::Surface->group(@surfaces)) {
|
|
my $difference = diff_ex(
|
|
[ map $_->p, @$group ],
|
|
[ map $_->p, @bridges ],
|
|
);
|
|
push @{$self->surfaces}, map Slic3r::Surface->cast_from_expolygon($_,
|
|
surface_type => $group->[0]->surface_type), @$difference;
|
|
}
|
|
}
|
|
}
|
|
|
|
1;
|