384 lines
14 KiB
Perl
384 lines
14 KiB
Perl
package Slic3r::Print;
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use Moo;
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use Math::Clipper ':all';
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use Slic3r::Geometry::Clipper qw(diff_ex union_ex);
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use XXX;
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use constant X => 0;
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use constant Y => 1;
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has 'x_length' => (
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is => 'ro',
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required => 1,
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coerce => sub { sprintf '%.0f', $_[0] },
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);
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has 'y_length' => (
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is => 'ro',
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required => 1,
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coerce => sub { sprintf '%.0f', $_[0] },
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);
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has 'layers' => (
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traits => ['Array'],
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Layer]',
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default => sub { [] },
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);
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sub new_from_stl {
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my $self = shift;
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my ($stl_file) = @_;
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my $print = Slic3r::STL->new->parse_file($stl_file);
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print "\n==> PROCESSING SLICES:\n";
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foreach my $layer (@{ $print->layers }) {
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printf "Making surfaces for layer %d:\n", $layer->id;
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# layer currently has many lines representing intersections of
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# model facets with the layer plane. there may also be lines
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# that we need to ignore (for example, when two non-horizontal
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# facets share a common edge on our plane, we get a single line;
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# however that line has no meaning for our layer as it's enclosed
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# inside a closed polyline)
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# build surfaces from sparse lines
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$layer->make_surfaces;
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}
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return $print;
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}
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sub layer_count {
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my $self = shift;
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return scalar @{ $self->layers };
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}
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sub max_length {
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my $self = shift;
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return ($self->x_length > $self->y_length) ? $self->x_length : $self->y_length;
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}
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sub layer {
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my $self = shift;
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my ($layer_id) = @_;
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# extend our print by creating all necessary layers
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if ($self->layer_count < $layer_id + 1) {
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for (my $i = $self->layer_count; $i <= $layer_id; $i++) {
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push @{ $self->layers }, Slic3r::Layer->new(id => $i);
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}
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}
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return $self->layers->[$layer_id];
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}
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sub detect_surfaces_type {
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my $self = shift;
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my $clipper = Math::Clipper->new;
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# prepare a reusable subroutine to make surface differences
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my $surface_difference = sub {
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my ($subject_surfaces, $clip_surfaces, $result_type) = @_;
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my $expolygons = diff_ex(
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[ map { ref $_ eq 'ARRAY' ? $_ : $_->p } @$subject_surfaces ],
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[ map { ref $_ eq 'ARRAY' ? $_ : $_->p } @$clip_surfaces ],
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);
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return grep $_->contour->is_printable,
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map Slic3r::Surface->cast_from_expolygon($_, surface_type => $result_type),
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@$expolygons;
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};
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for (my $i = 0; $i < $self->layer_count; $i++) {
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my $layer = $self->layers->[$i];
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Slic3r::debugf "Detecting solid surfaces for layer %d\n", $layer->id;
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my $upper_layer = $self->layers->[$i+1];
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my $lower_layer = $i > 0 ? $self->layers->[$i-1] : undef;
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my (@bottom, @top, @internal) = ();
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# find top surfaces (difference between current surfaces
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# of current layer and upper one)
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if ($upper_layer) {
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# offset upper layer surfaces by extrusion_width * perimeters
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@top = $surface_difference->($layer->surfaces, $upper_layer->surfaces, 'top');
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# now check whether each resulting top surfaces is large enough to have its
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# own perimeters or whether it may be sufficient to use the lower layer's
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# perimeters
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# offset upper layer's surfaces
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my $upper_surfaces_offsetted;
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{
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my $distance = $Slic3r::flow_width * ($Slic3r::perimeter_offsets + 1) / $Slic3r::resolution;
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$upper_surfaces_offsetted = offset([ map $_->p, @{$upper_layer->surfaces} ], $distance, 100, JT_MITER, 2);
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}
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@top = grep {
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my $surface = $_;
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my $diff = diff_ex([ map $_->p, $surface ], $upper_surfaces_offsetted);
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@$diff;
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} @top;
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} else {
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# if no upper layer, all surfaces of this one are solid
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@top = @{$layer->surfaces};
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$_->surface_type('top') for @top;
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}
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# find bottom surfaces (difference between current surfaces
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# of current layer and lower one)
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if ($lower_layer) {
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@bottom = $surface_difference->($layer->surfaces, $lower_layer->surfaces, 'bottom');
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$_->contour->merge_continuous_lines for @bottom;
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# merge_continuous_lines could return polylines with less than 3 points (thus invalid)
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# actually, this shouldn't happen so it deserves further investigation
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@bottom = grep $_->contour->is_valid, @bottom;
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foreach my $surface (@bottom) {
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$surface->contour->remove_acute_vertices;
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# okay, this is an Ugly Hack(tm) to avoid floating point math problems
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# with diagonal bridges. will find a nicer solution, promised.
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my $offset = offset([$surface->contour->p], 100, 100, JT_MITER, 2);
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@{$surface->contour->points} = map Slic3r::Point->new($_), @{ $offset->[0] };
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}
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#Slic3r::SVG::output(undef, "layer_" . $layer->id . "_diff.svg",
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# green_polygons => [ map $_->p, @{$layer->surfaces} ],
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# red_polygons => [ map $_->p, @{$lower_layer->surfaces} ],
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#);
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# offset lower layer's surfaces
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my $lower_surfaces_offsetted;
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{
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my $distance = $Slic3r::flow_width * ($Slic3r::perimeter_offsets + 1) / $Slic3r::resolution;
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$lower_surfaces_offsetted = offset([ map $_->p, @{$lower_layer->surfaces} ], $distance, 100, JT_MITER, 2);
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}
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@bottom = grep {
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my $surface = $_;
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my $diff = diff_ex([ map $_->p, $surface ], $lower_surfaces_offsetted);
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@$diff;
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} @bottom;
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} else {
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# if no lower layer, all surfaces of this one are solid
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@bottom = @{$layer->surfaces};
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$_->surface_type('bottom') for @bottom;
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}
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# find internal surfaces (difference between top/bottom surfaces and others)
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@internal = $surface_difference->($layer->surfaces, [@top, @bottom], 'internal');
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# save surfaces to layer
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$layer->surfaces([ @bottom, @top, @internal ]);
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#use Slic3r::SVG;
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#Slic3r::SVG::output(undef, "layer_" . $layer->id . ".svg",
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# white_polygons => [ map $_->p, @internal ],
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# green_polygons => [ map $_->p, @bottom ],
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# red_polygons => [ map $_->p, @top ],
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#);
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Slic3r::debugf " layer %d has %d bottom, %d top and %d internal surfaces\n",
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$layer->id, scalar(@bottom), scalar(@top), scalar(@internal);
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}
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}
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sub discover_horizontal_shells {
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my $self = shift;
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Slic3r::debugf "==> DISCOVERING HORIZONTAL SHELLS\n";
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my $clipper = Math::Clipper->new;
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for (my $i = 0; $i < $self->layer_count; $i++) {
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my $layer = $self->layers->[$i];
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foreach my $type (qw(top bottom)) {
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# find surfaces of current type for current layer
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my @surfaces = grep $_->surface_type eq $type, map @$_, @{$layer->fill_surfaces} or next;
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Slic3r::debugf "Layer %d has %d surfaces of type '%s'\n",
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$i, scalar(@surfaces), $type;
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for (my $n = $type eq 'top' ? $i-1 : $i+1;
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abs($n - $i) <= $Slic3r::solid_layers-1;
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$type eq 'top' ? $n-- : $n++) {
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next if $n < 0 || $n >= $self->layer_count;
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Slic3r::debugf " looking for neighbors on layer %d...\n", $n;
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foreach my $surfaces (@{$self->layers->[$n]->fill_surfaces}) {
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my $neighbor_polygons = [ map $_->p, grep $_->surface_type =~ /internal/, @$surfaces ];
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# find intersection between @surfaces and current layer's surfaces
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$clipper->add_subject_polygons([ map $_->p, @surfaces ]);
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$clipper->add_clip_polygons($neighbor_polygons);
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# intersections have contours and holes
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my $intersections = $clipper->ex_execute(CT_INTERSECTION, PFT_NONZERO, PFT_NONZERO);
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$clipper->clear;
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next if @$intersections == 0;
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Slic3r::debugf " %d intersections found\n", scalar @$intersections;
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# subtract intersections from layer surfaces to get resulting inner surfaces
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$clipper->add_subject_polygons($neighbor_polygons);
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$clipper->add_clip_polygons([ map { $_->{outer}, @{$_->{holes}} } @$intersections ]);
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my $internal_polygons = $clipper->ex_execute(CT_DIFFERENCE, PFT_NONZERO, PFT_NONZERO);
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$clipper->clear;
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# Note: due to floating point math we're going to get some very small
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# polygons as $internal_polygons; they will be removed by removed_small_features()
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# assign resulting inner surfaces to layer
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@$surfaces = ();
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foreach my $p (@$internal_polygons) {
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push @$surfaces, Slic3r::Surface->new(
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surface_type => 'internal',
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contour => Slic3r::Polyline::Closed->cast($p->{outer}),
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holes => [
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map Slic3r::Polyline::Closed->cast($_), @{$p->{holes}}
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],
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);
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}
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# assign new internal-solid surfaces to layer
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foreach my $p (@$intersections) {
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push @$surfaces, Slic3r::Surface->new(
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surface_type => 'internal-solid',
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contour => Slic3r::Polyline::Closed->cast($p->{outer}),
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holes => [
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map Slic3r::Polyline::Closed->cast($_), @{$p->{holes}}
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],
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);
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}
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}
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}
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}
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}
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}
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# remove surfaces which are too small to be extruded
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sub remove_small_surfaces {
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my $self = shift;
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$_->remove_small_surfaces for @{$self->layers};
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}
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# remove perimeters which are too small to be extruded
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sub remove_small_perimeters {
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my $self = shift;
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$_->remove_small_perimeters for @{$self->layers};
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}
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# make bridges printable
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sub process_bridges {
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my $self = shift;
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$_->process_bridges for @{ $self->layers };
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}
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sub extrude_perimeters {
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my $self = shift;
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my $perimeter_extruder = Slic3r::Perimeter->new;
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foreach my $layer (@{ $self->layers }) {
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$layer->detect_perimeter_surfaces;
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$perimeter_extruder->make_perimeter($layer);
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Slic3r::debugf " generated paths: %s\n",
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join ' ', map $_->id, @{ $layer->perimeters } if $Slic3r::debug;
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}
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}
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# splits fill_surfaces in internal and bridge surfaces
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sub split_bridges_fills {
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my $self = shift;
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$_->split_bridges_fills for @{$self->layers};
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}
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sub extrude_fills {
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my $self = shift;
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my $fill_extruder = Slic3r::Fill->new('print' => $self);
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foreach my $layer (@{ $self->layers }) {
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$fill_extruder->make_fill($layer);
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Slic3r::debugf " generated %d paths: %s\n",
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scalar @{ $layer->fills },
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join ' ', map $_->id, map @{$_->paths}, @{ $layer->fills } if $Slic3r::debug;
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}
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}
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sub export_gcode {
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my $self = shift;
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my ($file) = @_;
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printf "Exporting GCODE file...\n";
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# open output gcode file
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open my $fh, ">", $file
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or die "Failed to open $file for writing\n";
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# write start commands to file
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printf $fh "M104 S%d ; wait for temperature to be reached\n", $Slic3r::temperature;
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print $fh "$Slic3r::start_gcode\n";
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print $fh "G90 ; use absolute coordinates\n";
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print $fh "G21 ; set units to millimeters\n";
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if ($Slic3r::use_relative_e_distances) {
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print $fh "M83 ; use relative distances for extrusion\n";
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} else {
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print $fh "M82 ; use absolute distances for extrusion\n";
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}
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# set up our extruder object
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my $extruder = Slic3r::Extruder->new(
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# calculate X,Y shift to center print around specified origin
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shift_x => $Slic3r::print_center->[X] - ($self->x_length * $Slic3r::resolution / 2),
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shift_y => $Slic3r::print_center->[Y] - ($self->y_length * $Slic3r::resolution / 2),
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);
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# write gcode commands layer by layer
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foreach my $layer (@{ $self->layers }) {
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# with the --high-res-perimeters options enabled we extrude perimeters for
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# each layer twice at half height
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if ($Slic3r::high_res_perimeters && $layer->id > 0) {
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# go to half-layer
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printf $fh $extruder->move_z($Slic3r::z_offset + $layer->z * $Slic3r::resolution - $Slic3r::layer_height/2);
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# extrude perimeters
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$extruder->flow_ratio(0.5);
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printf $fh $extruder->extrude_loop($_, 'perimeter') for @{ $layer->perimeters };
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$extruder->flow_ratio(1);
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}
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# go to layer
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printf $fh $extruder->move_z($Slic3r::z_offset + $layer->z * $Slic3r::resolution);
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# extrude skirts
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printf $fh $extruder->extrude_loop($_, 'skirt') for @{ $layer->skirts };
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# extrude perimeters
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printf $fh $extruder->extrude_loop($_, 'perimeter') for @{ $layer->perimeters };
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# extrude fills
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for my $fill (@{ $layer->fills }) {
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printf $fh $extruder->extrude($_, 'fill')
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for $fill->shortest_path($extruder->last_pos);
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}
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}
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# write end commands to file
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print $fh "$Slic3r::end_gcode\n";
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# close our gcode file
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close $fh;
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}
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1;
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