609 lines
25 KiB
Perl
609 lines
25 KiB
Perl
package Slic3r::Print::Object;
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use Moo;
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use Slic3r::ExtrusionPath ':roles';
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use Slic3r::Geometry qw(scale unscale);
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use Slic3r::Geometry::Clipper qw(diff_ex intersection_ex union_ex);
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use Slic3r::Surface ':types';
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has 'input_file' => (is => 'rw', required => 0);
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has 'mesh' => (is => 'rw', required => 0);
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has 'x_length' => (is => 'rw', required => 1);
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has 'y_length' => (is => 'rw', required => 1);
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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 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 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 slice {
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my $self = shift;
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my %params = @_;
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# process facets
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{
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my $apply_lines = sub {
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my $lines = shift;
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foreach my $layer_id (keys %$lines) {
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my $layer = $self->layer($layer_id);
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$layer->add_line($_) for @{ $lines->{$layer_id} };
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}
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};
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Slic3r::parallelize(
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disable => ($#{$self->mesh->facets} < 500), # don't parallelize when too few facets
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items => [ 0..$#{$self->mesh->facets} ],
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thread_cb => sub {
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my $q = shift;
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my $result_lines = {};
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while (defined (my $facet_id = $q->dequeue)) {
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my $lines = $self->mesh->slice_facet($self, $facet_id);
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foreach my $layer_id (keys %$lines) {
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$result_lines->{$layer_id} ||= [];
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push @{ $result_lines->{$layer_id} }, @{ $lines->{$layer_id} };
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}
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}
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return $result_lines;
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},
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collect_cb => sub {
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$apply_lines->($_[0]);
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},
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no_threads_cb => sub {
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for (0..$#{$self->mesh->facets}) {
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my $lines = $self->mesh->slice_facet($self, $_);
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$apply_lines->($lines);
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}
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},
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);
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}
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die "Invalid input file\n" if !@{$self->layers};
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# free memory
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$self->mesh(undef) unless $params{keep_meshes};
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# remove last layer if empty
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# (we might have created it because of the $max_layer = ... + 1 code below)
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pop @{$self->layers} if !@{$self->layers->[-1]->surfaces} && !@{$self->layers->[-1]->lines};
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foreach my $layer (@{ $self->layers }) {
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Slic3r::debugf "Making surfaces for layer %d (slice z = %f):\n",
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$layer->id, unscale $layer->slice_z if $Slic3r::debug;
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# layer currently has many lines representing intersections of
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# model facets with the layer plane. there may also be lines
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# that we need to ignore (for example, when two non-horizontal
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# facets share a common edge on our plane, we get a single line;
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# however that line has no meaning for our layer as it's enclosed
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# inside a closed polyline)
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# build surfaces from sparse lines
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$layer->make_surfaces(Slic3r::TriangleMesh::make_loops($layer));
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# free memory
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$layer->lines(undef);
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}
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# detect slicing errors
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my $warning_thrown = 0;
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for my $i (0 .. $#{$self->layers}) {
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my $layer = $self->layers->[$i];
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next unless $layer->slicing_errors;
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if (!$warning_thrown) {
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warn "The model has overlapping or self-intersecting facets. I tried to repair it, "
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. "however you might want to check the results or repair the input file and retry.\n";
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$warning_thrown = 1;
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}
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# try to repair the layer surfaces by merging all contours and all holes from
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# neighbor layers
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Slic3r::debugf "Attempting to repair layer %d\n", $i;
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my (@upper_surfaces, @lower_surfaces);
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for (my $j = $i+1; $j <= $#{$self->layers}; $j++) {
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if (!$self->layers->[$j]->slicing_errors) {
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@upper_surfaces = @{$self->layers->[$j]->slices};
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last;
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}
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}
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for (my $j = $i-1; $j >= 0; $j--) {
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if (!$self->layers->[$j]->slicing_errors) {
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@lower_surfaces = @{$self->layers->[$j]->slices};
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last;
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}
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}
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my $union = union_ex([
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map $_->expolygon->contour, @upper_surfaces, @lower_surfaces,
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]);
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my $diff = diff_ex(
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[ map @$_, @$union ],
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[ map $_->expolygon->holes, @upper_surfaces, @lower_surfaces, ],
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);
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@{$layer->slices} = map Slic3r::Surface->new
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(expolygon => $_, surface_type => S_TYPE_INTERNAL),
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@$diff;
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}
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# remove empty layers from bottom
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while (@{$self->layers} && !@{$self->layers->[0]->slices} && !@{$self->layers->[0]->thin_walls}) {
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shift @{$self->layers};
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for (my $i = 0; $i <= $#{$self->layers}; $i++) {
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$self->layers->[$i]->id($i);
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}
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}
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warn "No layers were detected. You might want to repair your STL file and retry.\n"
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if !@{$self->layers};
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}
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sub cleanup {
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my $self = shift;
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@{$self->layers} = ();
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}
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sub make_perimeters {
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my $self = shift;
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# compare each layer to the one below, and mark those slices needing
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# one additional inner perimeter, like the top of domed objects-
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# this algorithm makes sure that almost one perimeter is overlapping
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for my $layer_id (0 .. $self->layer_count-2) {
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my $layer = $self->layers->[$layer_id];
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my $upper_layer = $self->layers->[$layer_id+1];
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my $overlap = $layer->perimeters_flow->spacing; # one perimeter
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# compute polygons representing the thickness of the first external perimeter of
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# the upper layer slices
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my $upper = diff_ex(
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[ map @$_, map $_->expolygon->offset_ex(+ 0.5 * scale $layer->perimeters_flow->spacing), @{$upper_layer->slices} ],
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[ map @$_, map $_->expolygon->offset_ex(- scale($overlap) + (0.5 * scale $layer->perimeters_flow->spacing)), @{$upper_layer->slices} ],
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);
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next if !@$upper;
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# we need to limit our detection to the areas which would actually benefit from
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# more perimeters. so, let's compute the area we want to ignore
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my $ignore = [];
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{
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my $diff = diff_ex(
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[ map @$_, map $_->expolygon->offset_ex(- ($Slic3r::perimeters-0.5) * scale $layer->perimeters_flow->spacing), @{$layer->slices} ],
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[ map @{$_->expolygon}, @{$upper_layer->slices} ],
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);
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$ignore = [ map @$_, map $_->offset_ex(scale $layer->perimeters_flow->spacing), @$diff ];
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}
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foreach my $slice (@{$layer->slices}) {
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my $hypothetical_perimeter_num = $Slic3r::perimeters + 1;
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CYCLE: while (1) {
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# compute polygons representing the thickness of the hypotetical new internal perimeter
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# of our slice
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my $hypothetical_perimeter;
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{
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my $outer = [ map @$_, $slice->expolygon->offset_ex(- ($hypothetical_perimeter_num-1.5) * scale $layer->perimeters_flow->spacing) ];
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last CYCLE if !@$outer;
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my $inner = [ map @$_, $slice->expolygon->offset_ex(- ($hypothetical_perimeter_num-0.5) * scale $layer->perimeters_flow->spacing) ];
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last CYCLE if !@$inner;
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$hypothetical_perimeter = diff_ex($outer, $inner);
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}
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last CYCLE if !@$hypothetical_perimeter;
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my $intersection = intersection_ex([ map @$_, @$upper ], [ map @$_, @$hypothetical_perimeter ]);
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$intersection = diff_ex([ map @$_, @$intersection ], $ignore) if @$ignore;
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last CYCLE if !@{ $intersection };
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Slic3r::debugf " adding one more perimeter at layer %d\n", $layer_id;
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$slice->additional_inner_perimeters(($slice->additional_inner_perimeters || 0) + 1);
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$hypothetical_perimeter_num++;
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}
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}
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}
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$_->make_perimeters for @{$self->layers};
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}
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sub detect_surfaces_type {
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my $self = shift;
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Slic3r::debugf "Detecting solid surfaces...\n";
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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, $layer) = @_;
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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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1,
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);
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return grep $_->contour->is_printable($layer->flow->width),
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map Slic3r::Surface->new(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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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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@top = $surface_difference->($layer->slices, $upper_layer->slices, S_TYPE_TOP, $layer);
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} else {
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# if no upper layer, all surfaces of this one are solid
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@top = @{$layer->slices};
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$_->surface_type(S_TYPE_TOP) for @top;
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}
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# find bottom surfaces (difference between current surfaces
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# of current layer and lower one)
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if ($lower_layer) {
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@bottom = $surface_difference->($layer->slices, $lower_layer->slices, S_TYPE_BOTTOM, $layer);
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} else {
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# if no lower layer, all surfaces of this one are solid
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@bottom = @{$layer->slices};
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$_->surface_type(S_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, S_TYPE_TOP, $layer);
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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->slices, [@top, @bottom], S_TYPE_INTERNAL, $layer);
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# save surfaces to layer
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@{$layer->slices} = (@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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# clip surfaces to the fill boundaries
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foreach my $layer (@{$self->layers}) {
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@{$layer->surfaces} = ();
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foreach my $surface (@{$layer->slices}) {
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my $intersection = intersection_ex(
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[ $surface->p ],
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[ map @$_, @{$layer->fill_boundaries} ],
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);
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push @{$layer->surfaces}, map Slic3r::Surface->new
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(expolygon => $_, surface_type => $surface->surface_type),
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@$intersection;
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}
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# free memory
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@{$layer->fill_boundaries} = ();
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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 $area_threshold = scale($Slic3r::flow->spacing) ** 2;
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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 (S_TYPE_TOP, S_TYPE_BOTTOM) {
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# find surfaces of current type for current layer
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# and offset them to take perimeters into account
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my @surfaces = map $_->offset($Slic3r::perimeters * scale $layer->perimeters_flow->width),
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grep $_->surface_type == $type, @{$layer->fill_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 == S_TYPE_TOP ? 'top' : 'bottom');
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for (my $n = $type == S_TYPE_TOP ? $i-1 : $i+1;
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abs($n - $i) <= $Slic3r::solid_layers-1;
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$type == S_TYPE_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", $n;
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my @neighbor_surfaces = @{$self->layers->[$n]->surfaces};
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my @neighbor_fill_surfaces = @{$self->layers->[$n]->fill_surfaces};
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# find intersection between neighbor 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 == S_TYPE_INTERNAL || $_->surface_type == S_TYPE_INTERNALSOLID } @neighbor_surfaces ],
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undef, 1,
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);
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next if !@$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 $_->surface_type == S_TYPE_INTERNALSOLID, @neighbor_fill_surfaces ),
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( map @$_, @$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 $_->surface_type == S_TYPE_INTERNAL, @neighbor_fill_surfaces ],
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[ map @$_, @$internal_solid ],
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1,
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);
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Slic3r::debugf " %d internal-solid and %d internal surfaces found\n",
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scalar(@$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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my $neighbor_fill_surfaces = $self->layers->[$n]->fill_surfaces;
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@$neighbor_fill_surfaces = ();
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push @$neighbor_fill_surfaces, Slic3r::Surface->new
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(expolygon => $_, surface_type => S_TYPE_INTERNAL)
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for @$internal;
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# assign new internal-solid surfaces to layer
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push @$neighbor_fill_surfaces, Slic3r::Surface->new
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(expolygon => $_, surface_type => S_TYPE_INTERNALSOLID)
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for @$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 == S_TYPE_TOP || $_->surface_type == S_TYPE_BOTTOM } @neighbor_fill_surfaces)) {
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my $solid_surfaces = diff_ex(
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[ map $_->p, @$s ],
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[ map @$_, @$internal_solid, @$internal ],
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1,
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);
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push @$neighbor_fill_surfaces, Slic3r::Surface->new
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(expolygon => $_, 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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@{$layer->fill_surfaces} = grep $_->expolygon->area > $area_threshold, @{$layer->fill_surfaces};
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}
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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 && $Slic3r::fill_density > 0;
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my $area_threshold = scale($Slic3r::flow->spacing) ** 2;
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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 $_->surface_type == S_TYPE_INTERNAL, @{$layer->fill_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 && $_->surface_type == S_TYPE_INTERNAL,
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@{$lower_layer->fill_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 $_->surface_type == S_TYPE_INTERNAL, @{$layer->fill_surfaces} ],
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undef, 1,
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);
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# purge intersections, skip tiny regions
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@$intersection = grep $_->area > $area_threshold, @$intersection;
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next if !@$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 $_->surface_type != S_TYPE_INTERNAL, @{$layer->fill_surfaces};
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push @new_surfaces, map Slic3r::Surface->new
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(expolygon => $_, surface_type => S_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->new
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(expolygon => $_, surface_type => S_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 == S_TYPE_INTERNAL && $_->depth_layers == $depth,
|
|
@{$layer->fill_surfaces},
|
|
],
|
|
[ map @$_, @$intersection ],
|
|
1,
|
|
)};
|
|
}
|
|
@{$layer->fill_surfaces} = @new_surfaces;
|
|
}
|
|
|
|
# now we remove the intersections from lower layer
|
|
{
|
|
my @new_surfaces = ();
|
|
push @new_surfaces, grep $_->surface_type != S_TYPE_INTERNAL, @{$lower_layer->fill_surfaces};
|
|
foreach my $depth (1..$Slic3r::infill_every_layers) {
|
|
push @new_surfaces, map Slic3r::Surface->new
|
|
(expolygon => $_, surface_type => S_TYPE_INTERNAL, depth_layers => $depth),
|
|
|
|
# difference between internal layers with depth == $depth
|
|
# and the intersection found
|
|
@{diff_ex(
|
|
[
|
|
map $_->p, grep $_->surface_type == S_TYPE_INTERNAL && $_->depth_layers == $depth,
|
|
@{$lower_layer->fill_surfaces},
|
|
],
|
|
[ map @$_, @$intersection ],
|
|
1,
|
|
)};
|
|
}
|
|
@{$lower_layer->fill_surfaces} = @new_surfaces;
|
|
}
|
|
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
sub generate_support_material {
|
|
my $self = shift;
|
|
my %params = @_;
|
|
|
|
my $distance_from_object = 3; # mm
|
|
|
|
# determine unsupported surfaces
|
|
my %layers = ();
|
|
my @unsupported_expolygons = ();
|
|
{
|
|
my (@a, @b) = ();
|
|
for my $i (reverse 0 .. $#{$self->layers}) {
|
|
my $layer = $self->layers->[$i];
|
|
my @c = ();
|
|
if (@b) {
|
|
@c = @{diff_ex(
|
|
[ map @$_, @b ],
|
|
[ map @$_, map $_->expolygon->offset_ex(scale $distance_from_object), @{$layer->slices} ],
|
|
)};
|
|
$layers{$i} = [@c];
|
|
}
|
|
@b = @{union_ex([ map @$_, @c, @a ])};
|
|
|
|
# get unsupported surfaces for current layer as all bottom slices
|
|
# minus the bridges offsetted to cover their perimeters.
|
|
# actually, we are marking as bridges more than we should be, so
|
|
# better build support material for bridges too rather than ignoring
|
|
# those parts. a visibility check algorithm is needed.
|
|
# @a = @{diff_ex(
|
|
# [ map $_->p, grep $_->surface_type == S_TYPE_BOTTOM, @{$layer->slices} ],
|
|
# [ map @$_, map $_->expolygon->offset_ex(scale $layer->flow->spacing * $Slic3r::perimeters),
|
|
# grep $_->surface_type == S_TYPE_BOTTOM && defined $_->bridge_angle,
|
|
# @{$layer->fill_surfaces} ],
|
|
# )};
|
|
@a = map $_->expolygon->clone, grep $_->surface_type == S_TYPE_BOTTOM, @{$layer->slices};
|
|
|
|
$_->simplify(scale $layer->flow->spacing * 3) for @a;
|
|
push @unsupported_expolygons, @a;
|
|
}
|
|
}
|
|
return if !@unsupported_expolygons;
|
|
|
|
# generate paths for the pattern that we're going to use
|
|
my $support_patterns = [];
|
|
{
|
|
my @support_material_areas = map $_->offset_ex(scale 5),
|
|
@{union_ex([ map @$_, @unsupported_expolygons ])};
|
|
|
|
my $fill = Slic3r::Fill->new(print => $params{print});
|
|
foreach my $layer (map $self->layers->[$_], 0,1,2) { # ugly hack
|
|
$fill->filler('honeycomb')->layer($layer);
|
|
my @patterns = ();
|
|
foreach my $expolygon (@support_material_areas) {
|
|
my @paths = $fill->filler('honeycomb')->fill_surface(
|
|
Slic3r::Surface->new(
|
|
expolygon => $expolygon,
|
|
#bridge_angle => $Slic3r::fill_angle + 45 + $angle,
|
|
),
|
|
density => 0.20,
|
|
flow_spacing => $Slic3r::flow->spacing,
|
|
);
|
|
my $params = shift @paths;
|
|
|
|
push @patterns,
|
|
map Slic3r::ExtrusionPath->new(
|
|
polyline => Slic3r::Polyline->new(@$_),
|
|
role => EXTR_ROLE_SUPPORTMATERIAL,
|
|
depth_layers => 1,
|
|
flow_spacing => $params->{flow_spacing},
|
|
), @paths;
|
|
}
|
|
$_->deserialize for @patterns;
|
|
push @$support_patterns, [@patterns];
|
|
}
|
|
}
|
|
|
|
if (0) {
|
|
require "Slic3r/SVG.pm";
|
|
Slic3r::SVG::output(undef, "support.svg",
|
|
polylines => [ map $_->polyline, map @$_, @$support_patterns ],
|
|
);
|
|
}
|
|
|
|
# apply the pattern to layers
|
|
{
|
|
my $clip_pattern = sub {
|
|
my ($layer_id, $expolygons) = @_;
|
|
my @paths = ();
|
|
foreach my $expolygon (@$expolygons) {
|
|
push @paths, map { $_->deserialize; $_->clip_with_expolygon($expolygon) }
|
|
map $_->clip_with_polygon($expolygon->bounding_box_polygon),
|
|
@{$support_patterns->[ $layer_id % @$support_patterns ]};
|
|
};
|
|
return @paths;
|
|
};
|
|
my %layer_paths = ();
|
|
Slic3r::parallelize(
|
|
items => [ keys %layers ],
|
|
thread_cb => sub {
|
|
my $q = shift;
|
|
my $paths = {};
|
|
while (defined (my $layer_id = $q->dequeue)) {
|
|
$paths->{$layer_id} = [ $clip_pattern->($layer_id, $layers{$layer_id}) ];
|
|
}
|
|
return $paths;
|
|
},
|
|
collect_cb => sub {
|
|
my $paths = shift;
|
|
$layer_paths{$_} = $paths->{$_} for keys %$paths;
|
|
},
|
|
no_threads_cb => sub {
|
|
$layer_paths{$_} = [ $clip_pattern->($_, $layers{$_}) ] for keys %layers;
|
|
},
|
|
);
|
|
|
|
foreach my $layer_id (keys %layer_paths) {
|
|
my $layer = $self->layers->[$layer_id];
|
|
$layer->support_fills(Slic3r::ExtrusionPath::Collection->new);
|
|
push @{$layer->support_fills->paths}, @{$layer_paths{$layer_id}};
|
|
}
|
|
}
|
|
}
|
|
|
|
1;
|