416 lines
17 KiB
Perl
416 lines
17 KiB
Perl
package Slic3r::Print;
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use Moo;
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use Math::ConvexHull 1.0.4 qw(convex_hull);
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use Slic3r::Geometry qw(X Y PI);
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use Slic3r::Geometry::Clipper qw(explode_expolygons safety_offset diff_ex intersection_ex
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union_ex offset JT_ROUND JT_MITER);
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use XXX;
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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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# 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' ? $_ : ref $_ eq 'Slic3r::ExPolygon' ? @$_ : $_->p } @$subject_surfaces ],
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[ map { ref $_ eq 'ARRAY' ? $_ : ref $_ eq 'Slic3r::ExPolygon' ? @$_ : $_->p } @$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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# clip surfaces to the fill boundaries
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foreach my $layer (@{$self->layers}) {
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my $intersection = intersection_ex(
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[ map $_->p, @{$layer->surfaces} ],
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[ map $_->p, @{$layer->fill_boundaries} ],
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);
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@{$layer->surfaces} = map Slic3r::Surface->cast_from_expolygon
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($_, surface_type => 'internal'),
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@$intersection;
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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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# only consider those upper surfaces that are not small
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# (if they're too small, the interface with them can be treated
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# like a continuous solid surface instead of cutting a little
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# internal surface in it)
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my $min_area = ((7 * $Slic3r::flow_width / $Slic3r::resolution)**2) * PI;
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my $upper_surfaces = [ grep { $_->expolygon->contour->area > $min_area } @{$upper_layer->surfaces} ];
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@top = $surface_difference->($layer->surfaces, $upper_surfaces, 'top');
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} else {
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# if no upper layer, all surfaces of this one are solid
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@top = @{$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 $offset = safety_offset([$surface->contour->p]);
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@{$surface->contour->points} = map Slic3r::Point->new($_), @{ $offset->[0] };
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}
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} else {
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# if no lower layer, all surfaces of this one are solid
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@bottom = @{$layer->surfaces};
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$_->surface_type('bottom') for @bottom;
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}
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# now, if the object contained a thin membrane, we could have overlapping bottom
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# and top surfaces; let's do an intersection to discover them and consider them
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# as bottom surfaces (to allow for bridge detection)
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if (@top && @bottom) {
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my $overlapping = intersection_ex([ map $_->p, @top ], [ map $_->p, @bottom ]);
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Slic3r::debugf " layer %d contains %d membrane(s)\n", $layer->id, scalar(@$overlapping);
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@top = $surface_difference->([@top], $overlapping, 'top');
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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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$layer->surfaces([ @bottom, @top, @internal ]);
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Slic3r::debugf " layer %d has %d bottom, %d top and %d internal surfaces\n",
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$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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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 $type, @{$layer->surfaces} or next;
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my $surfaces_p = [ map $_->p, @surfaces ];
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Slic3r::debugf "Layer %d has %d surfaces of type '%s'\n",
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$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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my $surfaces = $self->layers->[$n]->surfaces;
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my @neighbor = @$surfaces;
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# find intersection between @surfaces and current layer's surfaces
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# intersections have contours and holes
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my $new_internal_solid = intersection_ex(
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$surfaces_p,
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[ map $_->p, grep $_->surface_type =~ /internal/, @neighbor ],
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);
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next if !@$new_internal_solid;
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# internal-solid are the union of the existing internal-solid surfaces
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# and new ones
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my $internal_solid = union_ex([
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( map $_->p, grep $_->surface_type eq 'internal-solid', @neighbor ),
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( map @$_, @$new_internal_solid ),
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]);
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# subtract intersections from layer surfaces to get resulting inner surfaces
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my $internal = diff_ex(
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[ map $_->p, grep $_->surface_type eq 'internal', @neighbor ],
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[ map @$_, @$internal_solid ],
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);
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Slic3r::debugf " %d internal-solid and %d internal surfaces found\n",
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scalar(@$internal_solid), scalar(@$internal);
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# Note: due to floating point math we're going to get some very small
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# polygons as $internal; they will be removed by removed_small_features()
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# assign resulting inner surfaces to layer
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@$surfaces = ();
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push @$surfaces, Slic3r::Surface->cast_from_expolygon
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($_, surface_type => 'internal')
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for @$internal;
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# assign new internal-solid surfaces to layer
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push @$surfaces, Slic3r::Surface->cast_from_expolygon
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($_, surface_type => 'internal-solid')
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for @$internal_solid;
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# assign top and bottom surfaces to layer
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foreach my $s (Slic3r::Surface->group(grep $_->surface_type =~ /top|bottom/, @neighbor)) {
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my $solid_surfaces = diff_ex(
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[ map $_->p, @$s ],
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[ map @$_, @$internal_solid, @$internal ],
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);
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push @$surfaces, Slic3r::Surface->cast_from_expolygon
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($_, surface_type => $s->[0]->surface_type, bridge_angle => $s->[0]->bridge_angle)
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for @$solid_surfaces;
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}
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}
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}
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}
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}
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sub extrude_skirt {
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my $self = shift;
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return unless $Slic3r::skirts > 0;
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# collect points from all layers contained in skirt height
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my @points = ();
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my @layers = map $self->layer($_), 0..($Slic3r::skirt_height-1);
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push @points, map @$_, map $_->p, map @{ $_->surfaces }, @layers;
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# find out convex hull
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my $convex_hull = convex_hull(\@points);
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# draw outlines from outside to inside
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my @skirts = ();
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for (my $i = $Slic3r::skirts - 1; $i >= 0; $i--) {
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my $distance = ($Slic3r::skirt_distance + ($Slic3r::flow_width * $i)) / $Slic3r::resolution;
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my $outline = offset([$convex_hull], $distance, $Slic3r::resolution * 100, JT_ROUND);
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push @skirts, Slic3r::ExtrusionLoop->cast([ @{$outline->[0]} ]);
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}
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# apply skirts to all layers
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push @{$_->skirts}, @skirts for @layers;
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}
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# combine fill surfaces across layers
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sub infill_every_layers {
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my $self = shift;
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return unless $Slic3r::infill_every_layers > 1;
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printf "==> COMBINING INFILL\n";
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# start from bottom, skip first layer
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for (my $i = 1; $i < $self->layer_count; $i++) {
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my $layer = $self->layer($i);
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# skip layer if no internal fill surfaces
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next if !grep $_->surface_type eq 'internal', @{$layer->surfaces};
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# for each possible depth, look for intersections with the lower layer
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# we do this from the greater depth to the smaller
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for (my $d = $Slic3r::infill_every_layers - 1; $d >= 1; $d--) {
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next if ($i - $d) < 0;
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my $lower_layer = $self->layer($i - 1);
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# select surfaces of the lower layer having the depth we're looking for
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my @lower_surfaces = grep $_->depth_layers == $d && $_->surface_type eq 'internal',
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@{$lower_layer->surfaces};
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next if !@lower_surfaces;
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# calculate intersection between our surfaces and theirs
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my $intersection = intersection_ex(
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[ map $_->p, grep $_->depth_layers <= $d, @lower_surfaces ],
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[ map $_->p, grep $_->surface_type eq 'internal', @{$layer->surfaces} ],
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);
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next if !@$intersection;
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my $intersection_offsetted = safety_offset([ map @$_, @$intersection ]);
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# new fill surfaces of the current layer are:
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# - any non-internal surface
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# - intersections found (with a $d + 1 depth)
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# - any internal surface not belonging to the intersection (with its original depth)
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{
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my @new_surfaces = ();
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push @new_surfaces, grep $_->surface_type ne 'internal', @{$layer->surfaces};
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push @new_surfaces, map Slic3r::Surface->cast_from_expolygon
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($_, surface_type => 'internal', depth_layers => $d + 1), @$intersection;
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foreach my $depth (reverse $d..$Slic3r::infill_every_layers) {
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push @new_surfaces, map Slic3r::Surface->cast_from_expolygon
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($_, surface_type => 'internal', depth_layers => $depth),
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# difference between our internal layers with depth == $depth
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# and the intersection found
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@{diff_ex(
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[
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map $_->p, grep $_->surface_type eq 'internal' && $_->depth_layers == $depth,
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@{$layer->surfaces},
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],
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$intersection_offsetted,
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)};
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}
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@{$layer->surfaces} = @new_surfaces;
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}
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# now we remove the intersections from lower layer
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{
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my @new_surfaces = ();
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push @new_surfaces, grep $_->surface_type ne 'internal', @{$lower_layer->surfaces};
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foreach my $depth (1..$Slic3r::infill_every_layers) {
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push @new_surfaces, map Slic3r::Surface->cast_from_expolygon
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($_, surface_type => 'internal', depth_layers => $depth),
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# difference between internal layers with depth == $depth
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# and the intersection found
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@{diff_ex(
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[
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map $_->p, grep $_->surface_type eq 'internal' && $_->depth_layers == $depth,
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@{$lower_layer->surfaces},
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],
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$intersection_offsetted,
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)};
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}
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@{$lower_layer->surfaces} = @new_surfaces;
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}
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}
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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 ; set temperature\n", $Slic3r::temperature if $Slic3r::temperature;
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print $fh "$Slic3r::start_gcode\n";
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printf $fh "M109 S%d ; wait for temperature to be reached\n", $Slic3r::temperature if $Slic3r::temperature;
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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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print $fh "G92 E0 ; reset extrusion distance\n" if !$Slic3r::no_extrusion;
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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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# go to layer
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printf $fh $extruder->change_layer($layer);
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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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