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|
package Slic3r::Print::Object;
use Moo;
use List::Util qw(min max sum first);
use Slic3r::Flow ':roles';
use Slic3r::Geometry qw(X Y Z PI scale unscale deg2rad rad2deg scaled_epsilon chained_path);
use Slic3r::Geometry::Clipper qw(diff diff_ex intersection intersection_ex union union_ex
offset offset_ex offset2 offset2_ex CLIPPER_OFFSET_SCALE JT_MITER);
use Slic3r::Print::State ':steps';
use Slic3r::Surface ':types';
has 'print' => (is => 'ro', weak_ref => 1, required => 1);
has 'model_object' => (is => 'ro', required => 1);
has 'region_volumes' => (is => 'rw', default => sub { [] }); # by region_id
has 'copies' => (is => 'ro'); # Slic3r::Point objects in scaled G-code coordinates
has 'config' => (is => 'ro', default => sub { Slic3r::Config::PrintObject->new });
has 'layer_height_ranges' => (is => 'rw', default => sub { [] }); # [ z_min, z_max, layer_height ]
has 'size' => (is => 'rw'); # XYZ in scaled coordinates
has '_copies_shift' => (is => 'rw'); # scaled coordinates to add to copies (to compensate for the alignment operated when creating the object but still preserving a coherent API for external callers)
has '_shifted_copies' => (is => 'rw'); # Slic3r::Point objects in scaled G-code coordinates in our coordinates
has 'layers' => (is => 'rw', default => sub { [] });
has 'support_layers' => (is => 'rw', default => sub { [] });
has 'fill_maker' => (is => 'lazy');
has '_state' => (is => 'ro', default => sub { Slic3r::Print::State->new });
sub BUILD {
my $self = shift;
# translate meshes so that we work with smaller coordinates
{
# compute the bounding box of the supplied meshes
my @meshes = map $self->model_object->volumes->[$_]->mesh,
map @$_,
grep defined $_,
@{$self->region_volumes};
my $bb = Slic3r::Geometry::BoundingBox->merge(map $_->bounding_box, @meshes);
# Translate meshes so that our toolpath generation algorithms work with smaller
# XY coordinates; this translation is an optimization and not strictly required.
# However, this also aligns object to Z = 0, which on the contrary is required
# since we don't assume input is already aligned.
# We store the XY translation so that we can place copies correctly in the output G-code
# (copies are expressed in G-code coordinates and this translation is not publicly exposed).
$self->_copies_shift(Slic3r::Point->new_scale($bb->x_min, $bb->y_min));
$self->_trigger_copies;
# Scale the object size and store it
my $scaled_bb = $bb->clone;
$scaled_bb->scale(1 / &Slic3r::SCALING_FACTOR);
$self->size($scaled_bb->size);
}
}
sub _build_fill_maker {
my $self = shift;
return Slic3r::Fill->new(bounding_box => $self->bounding_box);
}
sub _trigger_copies {
my $self = shift;
return if !defined $self->_copies_shift;
# order copies with a nearest neighbor search and translate them by _copies_shift
$self->_shifted_copies([
map {
my $c = $_->clone;
$c->translate(@{ $self->_copies_shift });
$c;
} @{$self->copies}[@{chained_path($self->copies)}]
]);
$self->print->_state->invalidate(STEP_SKIRT);
$self->print->_state->invalidate(STEP_BRIM);
}
# in unscaled coordinates
sub add_copy {
my ($self, $x, $y) = @_;
push @{$self->copies}, Slic3r::Point->new_scale($x, $y);
$self->_trigger_copies;
}
sub delete_last_copy {
my ($self) = @_;
pop @{$self->copies};
$self->_trigger_copies;
}
sub delete_all_copies {
my ($self) = @_;
@{$self->copies} = ();
$self->_trigger_copies;
}
sub layer_count {
my $self = shift;
return scalar @{ $self->layers };
}
sub bounding_box {
my $self = shift;
# since the object is aligned to origin, bounding box coincides with size
return Slic3r::Geometry::BoundingBox->new_from_points([ map Slic3r::Point->new(@$_[X,Y]), [0,0], $self->size ]);
}
# this should be idempotent
sub slice {
my $self = shift;
my %params = @_;
# init layers
{
@{$self->layers} = ();
# make layers taking custom heights into account
my $print_z = my $slice_z = my $height = my $id = 0;
# add raft layers
if ($self->config->raft_layers > 0) {
$print_z += $self->config->get_value('first_layer_height');
$print_z += $self->config->layer_height * ($self->config->raft_layers - 1);
$id += $self->config->raft_layers;
}
# loop until we have at least one layer and the max slice_z reaches the object height
my $max_z = unscale $self->size->[Z];
while (!@{$self->layers} || ($slice_z - $height) <= $max_z) {
# assign the default height to the layer according to the general settings
$height = ($id == 0)
? $self->config->get_value('first_layer_height')
: $self->config->layer_height;
# look for an applicable custom range
if (my $range = first { $_->[0] <= $slice_z && $_->[1] > $slice_z } @{$self->layer_height_ranges}) {
$height = $range->[2];
# if user set custom height to zero we should just skip the range and resume slicing over it
if ($height == 0) {
$slice_z += $range->[1] - $range->[0];
next;
}
}
$print_z += $height;
$slice_z += $height/2;
### Slic3r::debugf "Layer %d: height = %s; slice_z = %s; print_z = %s\n", $id, $height, $slice_z, $print_z;
push @{$self->layers}, Slic3r::Layer->new(
object => $self,
id => $id,
height => $height,
print_z => $print_z,
slice_z => $slice_z,
);
if (@{$self->layers} >= 2) {
$self->layers->[-2]->upper_layer($self->layers->[-1]);
}
$id++;
$slice_z += $height/2; # add the other half layer
}
}
# make sure all layers contain layer region objects for all regions
my $regions_count = $self->print->regions_count;
foreach my $layer (@{ $self->layers }) {
$layer->region($_) for 0 .. ($regions_count-1);
}
# process facets
for my $region_id (0..$#{$self->region_volumes}) {
next if !defined $self->region_volumes->[$region_id];
# compose mesh
my $mesh;
foreach my $volume_id (@{$self->region_volumes->[$region_id]}) {
if (defined $mesh) {
$mesh->merge($self->model_object->volumes->[$volume_id]->mesh);
} else {
$mesh = $self->model_object->volumes->[$volume_id]->mesh->clone;
}
}
# transform mesh
# we ignore the per-instance transformations currently and only
# consider the first one
$self->model_object->instances->[0]->transform_mesh($mesh, 1);
# align mesh to Z = 0 and apply XY shift
$mesh->translate((map unscale(-$_), @{$self->_copies_shift}), -$self->model_object->bounding_box->z_min);
{
my $loops = $mesh->slice([ map $_->slice_z, @{$self->layers} ]);
for my $layer_id (0..$#$loops) {
my $layerm = $self->layers->[$layer_id]->regions->[$region_id];
$layerm->make_surfaces($loops->[$layer_id]);
}
# TODO: read slicing_errors
}
}
# remove last layer(s) if empty
pop @{$self->layers} while @{$self->layers} && (!map @{$_->slices}, @{$self->layers->[-1]->regions});
foreach my $layer (@{ $self->layers }) {
# merge all regions' slices to get islands
$layer->make_slices;
}
# detect slicing errors
my $warning_thrown = 0;
for my $i (0 .. $#{$self->layers}) {
my $layer = $self->layers->[$i];
next unless $layer->slicing_errors;
if (!$warning_thrown) {
warn "The model has overlapping or self-intersecting facets. I tried to repair it, "
. "however you might want to check the results or repair the input file and retry.\n";
$warning_thrown = 1;
}
# try to repair the layer surfaces by merging all contours and all holes from
# neighbor layers
Slic3r::debugf "Attempting to repair layer %d\n", $i;
foreach my $region_id (0 .. $#{$layer->regions}) {
my $layerm = $layer->region($region_id);
my (@upper_surfaces, @lower_surfaces);
for (my $j = $i+1; $j <= $#{$self->layers}; $j++) {
if (!$self->layers->[$j]->slicing_errors) {
@upper_surfaces = @{$self->layers->[$j]->region($region_id)->slices};
last;
}
}
for (my $j = $i-1; $j >= 0; $j--) {
if (!$self->layers->[$j]->slicing_errors) {
@lower_surfaces = @{$self->layers->[$j]->region($region_id)->slices};
last;
}
}
my $union = union_ex([
map $_->expolygon->contour, @upper_surfaces, @lower_surfaces,
]);
my $diff = diff_ex(
[ map @$_, @$union ],
[ map @{$_->expolygon->holes}, @upper_surfaces, @lower_surfaces, ],
);
$layerm->slices->clear;
$layerm->slices->append(
map Slic3r::Surface->new
(expolygon => $_, surface_type => S_TYPE_INTERNAL),
@$diff
);
}
# update layer slices after repairing the single regions
$layer->make_slices;
}
# remove empty layers from bottom
my $first_object_layer_id = $self->config->raft_layers;
while (@{$self->layers} && !@{$self->layers->[$first_object_layer_id]->slices}) {
splice @{$self->layers}, $first_object_layer_id, 1;
for (my $i = $first_object_layer_id; $i <= $#{$self->layers}; $i++) {
$self->layers->[$i]->id($i);
}
}
# simplify slices if required
if ($self->print->config->resolution) {
$self->_simplify_slices(scale($self->print->config->resolution));
}
}
sub make_perimeters {
my $self = shift;
# compare each layer to the one below, and mark those slices needing
# one additional inner perimeter, like the top of domed objects-
# this algorithm makes sure that at least one perimeter is overlapping
# but we don't generate any extra perimeter if fill density is zero, as they would be floating
# inside the object - infill_only_where_needed should be the method of choice for printing
# hollow objects
for my $region_id (0 .. ($self->print->regions_count-1)) {
my $region = $self->print->regions->[$region_id];
my $region_perimeters = $region->config->perimeters;
if ($region->config->extra_perimeters && $region_perimeters > 0 && $region->config->fill_density > 0) {
for my $layer_id (0 .. $self->layer_count-2) {
my $layerm = $self->layers->[$layer_id]->regions->[$region_id];
my $upper_layerm = $self->layers->[$layer_id+1]->regions->[$region_id];
my $perimeter_spacing = $layerm->flow(FLOW_ROLE_PERIMETER)->scaled_spacing;
my $overlap = $perimeter_spacing; # one perimeter
my $diff = diff(
offset([ map @{$_->expolygon}, @{$layerm->slices} ], -($region_perimeters * $perimeter_spacing)),
offset([ map @{$_->expolygon}, @{$upper_layerm->slices} ], -$overlap),
);
next if !@$diff;
# if we need more perimeters, $diff should contain a narrow region that we can collapse
# we use a higher miterLimit here to handle areas with acute angles
# in those cases, the default miterLimit would cut the corner and we'd
# get a triangle that would trigger a non-needed extra perimeter
$diff = diff(
$diff,
offset2($diff, -$perimeter_spacing, +$perimeter_spacing, CLIPPER_OFFSET_SCALE, JT_MITER, 5),
1,
);
next if !@$diff;
# diff contains the collapsed area
foreach my $slice (@{$layerm->slices}) {
my $extra_perimeters = 0;
CYCLE: while (1) {
# compute polygons representing the thickness of the hypotetical new internal perimeter
# of our slice
$extra_perimeters++;
my $hypothetical_perimeter = diff(
offset($slice->expolygon->arrayref, -($perimeter_spacing * ($region_perimeters + $extra_perimeters-1))),
offset($slice->expolygon->arrayref, -($perimeter_spacing * ($region_perimeters + $extra_perimeters))),
);
last CYCLE if !@$hypothetical_perimeter; # no extra perimeter is possible
# only add the perimeter if there's an intersection with the collapsed area
last CYCLE if !@{ intersection($diff, $hypothetical_perimeter) };
Slic3r::debugf " adding one more perimeter at layer %d\n", $layer_id;
$slice->extra_perimeters($extra_perimeters);
}
}
}
}
}
Slic3r::parallelize(
threads => $self->print->config->threads,
items => sub { 0 .. ($self->layer_count-1) },
thread_cb => sub {
my $q = shift;
while (defined (my $layer_id = $q->dequeue)) {
$self->layers->[$layer_id]->make_perimeters;
}
},
collect_cb => sub {},
no_threads_cb => sub {
$_->make_perimeters for @{$self->layers};
},
);
# simplify slices (both layer and region slices),
# we only need the max resolution for perimeters
### This makes this method not-idempotent, so we keep it disabled for now.
###$self->_simplify_slices(&Slic3r::SCALED_RESOLUTION);
}
sub detect_surfaces_type {
my $self = shift;
Slic3r::debugf "Detecting solid surfaces...\n";
for my $region_id (0 .. ($self->print->regions_count-1)) {
for my $i (0 .. ($self->layer_count-1)) {
my $layerm = $self->layers->[$i]->regions->[$region_id];
# prepare a reusable subroutine to make surface differences
my $difference = sub {
my ($subject, $clip, $result_type) = @_;
my $diff = diff(
[ map @$_, @$subject ],
[ map @$_, @$clip ],
);
# collapse very narrow parts (using the safety offset in the diff is not enough)
my $offset = $layerm->flow(FLOW_ROLE_PERIMETER)->scaled_width / 10;
return map Slic3r::Surface->new(expolygon => $_, surface_type => $result_type),
@{ offset2_ex($diff, -$offset, +$offset) };
};
# comparison happens against the *full* slices (considering all regions)
my $upper_layer = $self->layers->[$i+1];
my $lower_layer = $i > 0 ? $self->layers->[$i-1] : undef;
my (@bottom, @top, @internal) = ();
# find top surfaces (difference between current surfaces
# of current layer and upper one)
if ($upper_layer) {
@top = $difference->(
[ map $_->expolygon, @{$layerm->slices} ],
$upper_layer->slices,
S_TYPE_TOP,
);
} else {
# if no upper layer, all surfaces of this one are solid
# we clone surfaces because we're going to clear the slices collection
@top = map $_->clone, @{$layerm->slices};
$_->surface_type(S_TYPE_TOP) for @top;
}
# find bottom surfaces (difference between current surfaces
# of current layer and lower one)
if ($lower_layer) {
# lower layer's slices are already Surface objects
@bottom = $difference->(
[ map $_->expolygon, @{$layerm->slices} ],
$lower_layer->slices,
S_TYPE_BOTTOM,
);
} else {
# if no lower layer, all surfaces of this one are solid
# we clone surfaces because we're going to clear the slices collection
@bottom = map $_->clone, @{$layerm->slices};
$_->surface_type(S_TYPE_BOTTOM) for @bottom;
}
# now, if the object contained a thin membrane, we could have overlapping bottom
# and top surfaces; let's do an intersection to discover them and consider them
# as bottom surfaces (to allow for bridge detection)
if (@top && @bottom) {
my $overlapping = intersection_ex([ map $_->p, @top ], [ map $_->p, @bottom ]);
Slic3r::debugf " layer %d contains %d membrane(s)\n", $layerm->id, scalar(@$overlapping)
if $Slic3r::debug;
@top = $difference->([map $_->expolygon, @top], $overlapping, S_TYPE_TOP);
}
# find internal surfaces (difference between top/bottom surfaces and others)
@internal = $difference->(
[ map $_->expolygon, @{$layerm->slices} ],
[ map $_->expolygon, @top, @bottom ],
S_TYPE_INTERNAL,
);
# save surfaces to layer
$layerm->slices->clear;
$layerm->slices->append(@bottom, @top, @internal);
Slic3r::debugf " layer %d has %d bottom, %d top and %d internal surfaces\n",
$layerm->id, scalar(@bottom), scalar(@top), scalar(@internal) if $Slic3r::debug;
}
# clip surfaces to the fill boundaries
foreach my $layer (@{$self->layers}) {
my $layerm = $layer->regions->[$region_id];
my $fill_boundaries = [ map $_->clone->p, @{$layerm->fill_surfaces} ];
$layerm->fill_surfaces->clear;
foreach my $surface (@{$layerm->slices}) {
my $intersection = intersection_ex(
[ $surface->p ],
$fill_boundaries,
);
$layerm->fill_surfaces->append(map Slic3r::Surface->new
(expolygon => $_, surface_type => $surface->surface_type),
@$intersection);
}
}
}
}
sub clip_fill_surfaces {
my $self = shift;
return unless $self->config->infill_only_where_needed;
# We only want infill under ceilings; this is almost like an
# internal support material.
my $additional_margin = scale 3;
my $overhangs = []; # arrayref of polygons
for my $layer_id (reverse 0..$#{$self->layers}) {
my $layer = $self->layers->[$layer_id];
my @layer_internal = ();
my @new_internal = ();
# clip this layer's internal surfaces to @overhangs
foreach my $layerm (@{$layer->regions}) {
# we assume that this step is run before bridge_over_infill() and combine_infill()
# so these are the only internal types we might have
my (@internal, @other) = ();
foreach my $surface (map $_->clone, @{$layerm->fill_surfaces}) {
$surface->surface_type == S_TYPE_INTERNAL
? push @internal, $surface
: push @other, $surface;
}
# keep all the original internal surfaces to detect overhangs in this layer
push @layer_internal, @internal;
push @new_internal, my @new = map Slic3r::Surface->new(
expolygon => $_,
surface_type => S_TYPE_INTERNAL,
),
@{intersection_ex(
$overhangs,
[ map $_->p, @internal ],
)};
$layerm->fill_surfaces->clear;
$layerm->fill_surfaces->append(@new, @other);
}
# get this layer's overhangs defined as the full slice minus the internal infill
# (thus we also consider perimeters)
if ($layer_id > 0) {
my $solid = diff(
[ map @$_, @{$layer->slices} ],
\@layer_internal,
);
$overhangs = offset($solid, +$additional_margin);
push @$overhangs, @new_internal; # propagate upper overhangs
}
}
}
sub bridge_over_infill {
my $self = shift;
for my $region_id (0..$#{$self->print->regions}) {
my $fill_density = $self->print->regions->[$region_id]->config->fill_density;
next if $fill_density == 1 || $fill_density == 0;
for my $layer_id (1..$#{$self->layers}) {
my $layer = $self->layers->[$layer_id];
my $layerm = $layer->regions->[$region_id];
my $lower_layer = $self->layers->[$layer_id-1];
# compute the areas needing bridge math
my @internal_solid = @{$layerm->fill_surfaces->filter_by_type(S_TYPE_INTERNALSOLID)};
my @lower_internal = map @{$_->fill_surfaces->filter_by_type(S_TYPE_INTERNAL)}, @{$lower_layer->regions};
my $to_bridge = intersection_ex(
[ map $_->p, @internal_solid ],
[ map $_->p, @lower_internal ],
);
next unless @$to_bridge;
Slic3r::debugf "Bridging %d internal areas at layer %d\n", scalar(@$to_bridge), $layer_id;
# build the new collection of fill_surfaces
{
my @new_surfaces = map $_->clone, grep $_->surface_type != S_TYPE_INTERNALSOLID, @{$layerm->fill_surfaces};
push @new_surfaces, map Slic3r::Surface->new(
expolygon => $_,
surface_type => S_TYPE_INTERNALBRIDGE,
), @$to_bridge;
push @new_surfaces, map Slic3r::Surface->new(
expolygon => $_,
surface_type => S_TYPE_INTERNALSOLID,
), @{diff_ex(
[ map $_->p, @internal_solid ],
[ map @$_, @$to_bridge ],
1,
)};
$layerm->fill_surfaces->clear;
$layerm->fill_surfaces->append(@new_surfaces);
}
# exclude infill from the layers below if needed
# see discussion at https://github.com/alexrj/Slic3r/issues/240
# Update: do not exclude any infill. Sparse infill is able to absorb the excess material.
if (0) {
my $excess = $layerm->extruders->{infill}->bridge_flow->width - $layerm->height;
for (my $i = $layer_id-1; $excess >= $self->layers->[$i]->height; $i--) {
Slic3r::debugf " skipping infill below those areas at layer %d\n", $i;
foreach my $lower_layerm (@{$self->layers->[$i]->regions}) {
my @new_surfaces = ();
# subtract the area from all types of surfaces
foreach my $group (@{$lower_layerm->fill_surfaces->group}) {
push @new_surfaces, map $group->[0]->clone(expolygon => $_),
@{diff_ex(
[ map $_->p, @$group ],
[ map @$_, @$to_bridge ],
)};
push @new_surfaces, map Slic3r::Surface->new(
expolygon => $_,
surface_type => S_TYPE_INTERNALVOID,
), @{intersection_ex(
[ map $_->p, @$group ],
[ map @$_, @$to_bridge ],
)};
}
$lower_layerm->fill_surfaces->clear;
$lower_layerm->fill_surfaces->append(@new_surfaces);
}
$excess -= $self->layers->[$i]->height;
}
}
}
}
}
sub process_external_surfaces {
my ($self) = @_;
for my $region_id (0 .. ($self->print->regions_count-1)) {
$self->layers->[0]->regions->[$region_id]->process_external_surfaces(undef);
for my $layer_id (1 .. ($self->layer_count-1)) {
$self->layers->[$layer_id]->regions->[$region_id]->process_external_surfaces($self->layers->[$layer_id-1]);
}
}
}
sub discover_horizontal_shells {
my $self = shift;
Slic3r::debugf "==> DISCOVERING HORIZONTAL SHELLS\n";
for my $region_id (0 .. ($self->print->regions_count-1)) {
for (my $i = 0; $i < $self->layer_count; $i++) {
my $layerm = $self->layers->[$i]->regions->[$region_id];
if ($layerm->config->solid_infill_every_layers && $layerm->config->fill_density > 0
&& ($i % $layerm->config->solid_infill_every_layers) == 0) {
$_->surface_type(S_TYPE_INTERNALSOLID) for @{$layerm->fill_surfaces->filter_by_type(S_TYPE_INTERNAL)};
}
EXTERNAL: foreach my $type (S_TYPE_TOP, S_TYPE_BOTTOM) {
# find slices of current type for current layer
# use slices instead of fill_surfaces because they also include the perimeter area
# which needs to be propagated in shells; we need to grow slices like we did for
# fill_surfaces though. Using both ungrown slices and grown fill_surfaces will
# not work in some situations, as there won't be any grown region in the perimeter
# area (this was seen in a model where the top layer had one extra perimeter, thus
# its fill_surfaces were thinner than the lower layer's infill), however it's the best
# solution so far. Growing the external slices by EXTERNAL_INFILL_MARGIN will put
# too much solid infill inside nearly-vertical slopes.
my $solid = [
(map $_->p, @{$layerm->slices->filter_by_type($type)}),
(map $_->p, @{$layerm->fill_surfaces->filter_by_type($type)}),
];
next if !@$solid;
Slic3r::debugf "Layer %d has %s surfaces\n", $i, ($type == S_TYPE_TOP) ? 'top' : 'bottom';
my $solid_layers = ($type == S_TYPE_TOP)
? $layerm->config->top_solid_layers
: $layerm->config->bottom_solid_layers;
NEIGHBOR: for (my $n = ($type == S_TYPE_TOP) ? $i-1 : $i+1;
abs($n - $i) <= $solid_layers-1;
($type == S_TYPE_TOP) ? $n-- : $n++) {
next if $n < 0 || $n >= $self->layer_count;
Slic3r::debugf " looking for neighbors on layer %d...\n", $n;
my $neighbor_fill_surfaces = $self->layers->[$n]->regions->[$region_id]->fill_surfaces;
my @neighbor_fill_surfaces = map $_->clone, @$neighbor_fill_surfaces; # clone because we will use these surfaces even after clearing the collection
# find intersection between neighbor and current layer's surfaces
# intersections have contours and holes
# we update $solid so that we limit the next neighbor layer to the areas that were
# found on this one - in other words, solid shells on one layer (for a given external surface)
# are always a subset of the shells found on the previous shell layer
# this approach allows for DWIM in hollow sloping vases, where we want bottom
# shells to be generated in the base but not in the walls (where there are many
# narrow bottom surfaces): reassigning $solid will consider the 'shadow' of the
# upper perimeter as an obstacle and shell will not be propagated to more upper layers
my $new_internal_solid = $solid = intersection(
$solid,
[ map $_->p, grep { ($_->surface_type == S_TYPE_INTERNAL) || ($_->surface_type == S_TYPE_INTERNALSOLID) } @neighbor_fill_surfaces ],
1,
);
next EXTERNAL if !@$new_internal_solid;
# make sure the new internal solid is wide enough, as it might get collapsed when
# spacing is added in Fill.pm
{
# we use a higher miterLimit here to handle areas with acute angles
# in those cases, the default miterLimit would cut the corner and we'd
# get a triangle in $too_narrow; if we grow it below then the shell
# would have a different shape from the external surface and we'd still
# have the same angle, so the next shell would be grown even more and so on.
my $margin = 3 * $layerm->flow(FLOW_ROLE_SOLID_INFILL)->scaled_width; # require at least this size
my $too_narrow = diff(
$new_internal_solid,
offset2($new_internal_solid, -$margin, +$margin, CLIPPER_OFFSET_SCALE, JT_MITER, 5),
1,
);
# if some parts are going to collapse, use a different strategy according to fill density
if (@$too_narrow) {
if ($layerm->config->fill_density > 0) {
# if we have internal infill, grow the collapsing parts and add the extra area to
# the neighbor layer as well as to our original surfaces so that we support this
# additional area in the next shell too
# make sure our grown surfaces don't exceed the fill area
my @grown = @{intersection(
offset($too_narrow, +$margin),
[ map $_->p, @neighbor_fill_surfaces ],
)};
$new_internal_solid = $solid = [ @grown, @$new_internal_solid ];
} else {
# if we're printing a hollow object, we discard such small parts
$new_internal_solid = $solid = diff(
$new_internal_solid,
$too_narrow,
);
}
}
}
# internal-solid are the union of the existing internal-solid surfaces
# and new ones
my $internal_solid = union_ex([
( map $_->p, grep $_->surface_type == S_TYPE_INTERNALSOLID, @neighbor_fill_surfaces ),
@$new_internal_solid,
]);
# subtract intersections from layer surfaces to get resulting internal surfaces
my $internal = diff_ex(
[ map $_->p, grep $_->surface_type == S_TYPE_INTERNAL, @neighbor_fill_surfaces ],
[ map @$_, @$internal_solid ],
1,
);
Slic3r::debugf " %d internal-solid and %d internal surfaces found\n",
scalar(@$internal_solid), scalar(@$internal);
# assign resulting internal surfaces to layer
$neighbor_fill_surfaces->clear;
$neighbor_fill_surfaces->append(map Slic3r::Surface->new
(expolygon => $_, surface_type => S_TYPE_INTERNAL), @$internal);
# assign new internal-solid surfaces to layer
$neighbor_fill_surfaces->append(map Slic3r::Surface->new
(expolygon => $_, surface_type => S_TYPE_INTERNALSOLID), @$internal_solid);
# assign top and bottom surfaces to layer
foreach my $s (@{Slic3r::Surface::Collection->new(grep { ($_->surface_type == S_TYPE_TOP) || ($_->surface_type == S_TYPE_BOTTOM) } @neighbor_fill_surfaces)->group}) {
my $solid_surfaces = diff_ex(
[ map $_->p, @$s ],
[ map @$_, @$internal_solid, @$internal ],
1,
);
$neighbor_fill_surfaces->append(map $s->[0]->clone(expolygon => $_), @$solid_surfaces);
}
}
}
}
}
}
# combine fill surfaces across layers
sub combine_infill {
my $self = shift;
return unless defined first { $_->config->infill_every_layers > 1 && $_->config->fill_density > 0 } @{$self->print->regions};
my $layer_count = $self->layer_count;
my @layer_heights = map $self->layers->[$_]->height, 0 .. $layer_count-1;
for my $region_id (0 .. ($self->print->regions_count-1)) {
my $region = $self->print->regions->[$region_id];
my $every = $region->config->infill_every_layers;
# limit the number of combined layers to the maximum height allowed by this regions' nozzle
my $nozzle_diameter = $self->print->config->nozzle_diameter->[ $region->config->infill_extruder-1 ];
# define the combinations
my @combine = (); # layer_id => thickness in layers
{
my $current_height = my $layers = 0;
for my $layer_id (1 .. $#layer_heights) {
my $height = $self->layers->[$layer_id]->height;
if ($current_height + $height >= $nozzle_diameter || $layers >= $every) {
$combine[$layer_id-1] = $layers;
$current_height = $layers = 0;
}
$current_height += $height;
$layers++;
}
}
# skip bottom layer
for my $layer_id (1 .. $#combine) {
next unless ($combine[$layer_id] // 1) > 1;
my @layerms = map $self->layers->[$_]->regions->[$region_id],
($layer_id - ($combine[$layer_id]-1) .. $layer_id);
# only combine internal infill
for my $type (S_TYPE_INTERNAL) {
# we need to perform a multi-layer intersection, so let's split it in pairs
# initialize the intersection with the candidates of the lowest layer
my $intersection = [ map $_->expolygon, @{$layerms[0]->fill_surfaces->filter_by_type($type)} ];
# start looping from the second layer and intersect the current intersection with it
for my $layerm (@layerms[1 .. $#layerms]) {
$intersection = intersection_ex(
[ map @$_, @$intersection ],
[ map @{$_->expolygon}, @{$layerm->fill_surfaces->filter_by_type($type)} ],
);
}
my $area_threshold = $layerms[0]->infill_area_threshold;
@$intersection = grep $_->area > $area_threshold, @$intersection;
next if !@$intersection;
Slic3r::debugf " combining %d %s regions from layers %d-%d\n",
scalar(@$intersection),
($type == S_TYPE_INTERNAL ? 'internal' : 'internal-solid'),
$layer_id-($every-1), $layer_id;
# $intersection now contains the regions that can be combined across the full amount of layers
# so let's remove those areas from all layers
my @intersection_with_clearance = map @{$_->offset(
$layerms[-1]->solid_infill_flow->scaled_width / 2
+ $layerms[-1]->perimeter_flow->scaled_width / 2
# Because fill areas for rectilinear and honeycomb are grown
# later to overlap perimeters, we need to counteract that too.
+ (($type == S_TYPE_INTERNALSOLID || $region->config->fill_pattern =~ /(rectilinear|honeycomb)/)
? $layerms[-1]->solid_infill_flow->scaled_width * &Slic3r::INFILL_OVERLAP_OVER_SPACING
: 0)
)}, @$intersection;
foreach my $layerm (@layerms) {
my @this_type = @{$layerm->fill_surfaces->filter_by_type($type)};
my @other_types = map $_->clone, grep $_->surface_type != $type, @{$layerm->fill_surfaces};
my @new_this_type = map Slic3r::Surface->new(expolygon => $_, surface_type => $type),
@{diff_ex(
[ map $_->p, @this_type ],
[ @intersection_with_clearance ],
)};
# apply surfaces back with adjusted depth to the uppermost layer
if ($layerm->id == $layer_id) {
push @new_this_type,
map Slic3r::Surface->new(
expolygon => $_,
surface_type => $type,
thickness => sum(map $_->height, @layerms),
thickness_layers => scalar(@layerms),
),
@$intersection;
} else {
# save void surfaces
push @this_type,
map Slic3r::Surface->new(expolygon => $_, surface_type => S_TYPE_INTERNALVOID),
@{intersection_ex(
[ map @{$_->expolygon}, @this_type ],
[ @intersection_with_clearance ],
)};
}
$layerm->fill_surfaces->clear;
$layerm->fill_surfaces->append(@new_this_type, @other_types);
}
}
}
}
}
sub generate_support_material {
my $self = shift;
return unless ($self->config->support_material || $self->config->raft_layers > 0)
&& $self->layer_count >= 2;
my $first_layer_flow = Slic3r::Flow->new_from_width(
width => ($self->config->first_layer_extrusion_width || $self->config->support_material_extrusion_width),
role => FLOW_ROLE_SUPPORT_MATERIAL,
nozzle_diameter => $self->print->config->nozzle_diameter->[ $self->config->support_material_extruder-1 ],
layer_height => $self->config->get_abs_value('first_layer_height'),
bridge_flow_ratio => 0,
);
my $s = Slic3r::Print::SupportMaterial->new(
print_config => $self->print->config,
object_config => $self->config,
first_layer_flow => $first_layer_flow,
flow => $self->support_material_flow,
interface_flow => $self->support_material_flow(FLOW_ROLE_SUPPORT_MATERIAL_INTERFACE),
);
$s->generate($self);
}
sub _simplify_slices {
my ($self, $distance) = @_;
foreach my $layer (@{$self->layers}) {
$layer->slices->simplify($distance);
$_->slices->simplify($distance) for @{$layer->regions};
}
}
sub support_material_flow {
my ($self, $role) = @_;
$role //= FLOW_ROLE_SUPPORT_MATERIAL;
my $extruder = ($role == FLOW_ROLE_SUPPORT_MATERIAL)
? $self->config->support_material_extruder
: $self->config->support_material_interface_extruder;
# we use a bogus layer_height because we use the same flow for all
# support material layers
return Slic3r::Flow->new_from_width(
width => $self->config->support_material_extrusion_width,
role => $role,
nozzle_diameter => $self->print->config->nozzle_diameter->[$extruder-1],
layer_height => $self->config->layer_height,
bridge_flow_ratio => 0,
);
}
1;
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