1154 lines
51 KiB
Perl
1154 lines
51 KiB
Perl
package Slic3r::Print::Object;
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use strict;
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use warnings;
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use List::Util qw(min max sum first);
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use Slic3r::Flow ':roles';
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use Slic3r::Geometry qw(X Y Z PI scale unscale chained_path);
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use Slic3r::Geometry::Clipper qw(diff diff_ex intersection intersection_ex union union_ex
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offset offset_ex offset2 offset2_ex intersection_ppl CLIPPER_OFFSET_SCALE JT_MITER);
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use Slic3r::Print::State ':steps';
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use Slic3r::Surface ':types';
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# TODO: lazy
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sub fill_maker {
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my $self = shift;
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return Slic3r::Fill->new(bounding_box => $self->bounding_box);
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}
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sub region_volumes {
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my $self = shift;
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return [ map $self->get_region_volumes($_), 0..($self->region_count - 1) ];
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}
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sub layers {
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my $self = shift;
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return [ map $self->get_layer($_), 0..($self->layer_count - 1) ];
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}
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sub support_layers {
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my $self = shift;
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return [ map $self->get_support_layer($_), 0..($self->support_layer_count - 1) ];
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}
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# this should be idempotent
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sub slice {
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my $self = shift;
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return if $self->step_done(STEP_SLICE);
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$self->set_step_started(STEP_SLICE);
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$self->print->status_cb->(10, "Processing triangulated mesh");
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# init layers
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{
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$self->clear_layers;
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# make layers taking custom heights into account
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my $id = 0;
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my $print_z = 0;
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my $first_object_layer_height = -1;
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my $first_object_layer_distance = -1;
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# add raft layers
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if ($self->config->raft_layers > 0) {
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$id += $self->config->raft_layers;
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# raise first object layer Z by the thickness of the raft itself
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# plus the extra distance required by the support material logic
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my $first_layer_height = $self->config->get_value('first_layer_height');
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$print_z += $first_layer_height;
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# use a large height
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my $support_material_layer_height;
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{
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my @nozzle_diameters = (
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map $self->print->config->get_at('nozzle_diameter', $_),
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$self->config->support_material_extruder-1,
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$self->config->support_material_interface_extruder-1,
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);
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$support_material_layer_height = 0.75 * min(@nozzle_diameters);
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}
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$print_z += $support_material_layer_height * ($self->config->raft_layers - 1);
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# compute the average of all nozzles used for printing the object
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my $nozzle_diameter;
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{
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my @nozzle_diameters = (
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map $self->print->config->get_at('nozzle_diameter', $_), @{$self->print->object_extruders}
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);
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$nozzle_diameter = sum(@nozzle_diameters)/@nozzle_diameters;
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}
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$first_object_layer_distance = $self->_support_material->contact_distance($self->config->layer_height, $nozzle_diameter);
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# force first layer print_z according to the contact distance
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# (the loop below will raise print_z by such height)
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$first_object_layer_height = $first_object_layer_distance - $self->config->support_material_contact_distance;
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}
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# loop until we have at least one layer and the max slice_z reaches the object height
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my $slice_z = 0;
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my $height = 0;
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my $max_z = unscale($self->size->z);
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while (($slice_z - $height) <= $max_z) {
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# assign the default height to the layer according to the general settings
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$height = ($id == 0)
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? $self->config->get_value('first_layer_height')
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: $self->config->layer_height;
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# look for an applicable custom range
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if (my $range = first { $_->[0] <= $slice_z && $_->[1] > $slice_z } @{$self->layer_height_ranges}) {
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$height = $range->[2];
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# if user set custom height to zero we should just skip the range and resume slicing over it
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if ($height == 0) {
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$slice_z += $range->[1] - $range->[0];
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next;
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}
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}
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if ($first_object_layer_height != -1 && !@{$self->layers}) {
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$height = $first_object_layer_height;
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$print_z += ($first_object_layer_distance - $height);
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}
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$print_z += $height;
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$slice_z += $height/2;
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### Slic3r::debugf "Layer %d: height = %s; slice_z = %s; print_z = %s\n", $id, $height, $slice_z, $print_z;
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$self->add_layer($id, $height, $print_z, $slice_z);
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if ($self->layer_count >= 2) {
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my $lc = $self->layer_count;
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$self->get_layer($lc - 2)->set_upper_layer($self->get_layer($lc - 1));
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$self->get_layer($lc - 1)->set_lower_layer($self->get_layer($lc - 2));
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}
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$id++;
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$slice_z += $height/2; # add the other half layer
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}
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}
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# make sure all layers contain layer region objects for all regions
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my $regions_count = $self->print->region_count;
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foreach my $layer (@{ $self->layers }) {
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$layer->region($_) for 0 .. ($regions_count-1);
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}
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# get array of Z coordinates for slicing
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my @z = map $_->slice_z, @{$self->layers};
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# slice all non-modifier volumes
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for my $region_id (0..($self->region_count - 1)) {
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my $expolygons_by_layer = $self->_slice_region($region_id, \@z, 0);
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for my $layer_id (0..$#$expolygons_by_layer) {
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my $layerm = $self->get_layer($layer_id)->regions->[$region_id];
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$layerm->slices->clear;
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foreach my $expolygon (@{ $expolygons_by_layer->[$layer_id] }) {
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$layerm->slices->append(Slic3r::Surface->new(
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expolygon => $expolygon,
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surface_type => S_TYPE_INTERNAL,
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));
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}
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}
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}
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# then slice all modifier volumes
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if ($self->region_count > 1) {
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for my $region_id (0..$self->region_count) {
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my $expolygons_by_layer = $self->_slice_region($region_id, \@z, 1);
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# loop through the other regions and 'steal' the slices belonging to this one
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for my $other_region_id (0..$self->region_count) {
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next if $other_region_id == $region_id;
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for my $layer_id (0..$#$expolygons_by_layer) {
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my $layerm = $self->get_layer($layer_id)->regions->[$region_id];
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my $other_layerm = $self->get_layer($layer_id)->regions->[$other_region_id];
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next if !defined $other_layerm;
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my $other_slices = [ map $_->p, @{$other_layerm->slices} ]; # Polygons
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my $my_parts = intersection_ex(
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$other_slices,
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[ map @$_, @{ $expolygons_by_layer->[$layer_id] } ],
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);
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next if !@$my_parts;
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# append new parts to our region
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foreach my $expolygon (@$my_parts) {
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$layerm->slices->append(Slic3r::Surface->new(
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expolygon => $expolygon,
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surface_type => S_TYPE_INTERNAL,
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));
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}
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# remove such parts from original region
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$other_layerm->slices->clear;
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$other_layerm->slices->append(Slic3r::Surface->new(
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expolygon => $_,
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surface_type => S_TYPE_INTERNAL,
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)) for @{ diff_ex($other_slices, [ map @$_, @$my_parts ]) };
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}
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}
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}
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}
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# remove last layer(s) if empty
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$self->delete_layer($self->layer_count - 1)
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while $self->layer_count && (!map @{$_->slices}, @{$self->get_layer($self->layer_count - 1)->regions});
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foreach my $layer (@{ $self->layers }) {
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# apply size compensation
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if ($self->config->xy_size_compensation != 0) {
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my $delta = scale($self->config->xy_size_compensation);
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if (@{$layer->regions} == 1) {
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# single region
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my $layerm = $layer->regions->[0];
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my $slices = [ map $_->p, @{$layerm->slices} ];
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$layerm->slices->clear;
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$layerm->slices->append(Slic3r::Surface->new(
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expolygon => $_,
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surface_type => S_TYPE_INTERNAL,
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)) for @{offset_ex($slices, $delta)};
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} else {
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if ($delta < 0) {
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# multiple regions, shrinking
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# we apply the offset to the combined shape, then intersect it
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# with the original slices for each region
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my $slices = union([ map $_->p, map @{$_->slices}, @{$layer->regions} ]);
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$slices = offset($slices, $delta);
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foreach my $layerm (@{$layer->regions}) {
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my $this_slices = intersection_ex(
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$slices,
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[ map $_->p, @{$layerm->slices} ],
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);
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$layerm->slices->clear;
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$layerm->slices->append(Slic3r::Surface->new(
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expolygon => $_,
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surface_type => S_TYPE_INTERNAL,
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)) for @$this_slices;
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}
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} else {
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# multiple regions, growing
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# this is an ambiguous case, since it's not clear how to grow regions where they are going to overlap
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# so we give priority to the first one and so on
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for my $i (0..$#{$layer->regions}) {
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my $layerm = $layer->regions->[$i];
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my $slices = offset_ex([ map $_->p, @{$layerm->slices} ], $delta);
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if ($i > 0) {
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$slices = diff_ex(
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[ map @$_, @$slices ],
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[ map $_->p, map @{$_->slices}, map $layer->regions->[$_], 0..($i-1) ], # slices of already processed regions
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);
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}
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$layerm->slices->clear;
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$layerm->slices->append(Slic3r::Surface->new(
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expolygon => $_,
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surface_type => S_TYPE_INTERNAL,
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)) for @$slices;
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}
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}
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}
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}
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# merge all regions' slices to get islands
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$layer->make_slices;
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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->layer_count - 1)) {
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my $layer = $self->get_layer($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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foreach my $region_id (0 .. ($layer->region_count - 1)) {
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my $layerm = $layer->region($region_id);
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my (@upper_surfaces, @lower_surfaces);
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for (my $j = $i+1; $j < $self->layer_count; $j++) {
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if (!$self->get_layer($j)->slicing_errors) {
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@upper_surfaces = @{$self->get_layer($j)->region($region_id)->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->get_layer($j)->slicing_errors) {
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@lower_surfaces = @{$self->get_layer($j)->region($region_id)->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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$layerm->slices->clear;
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$layerm->slices->append($_)
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for 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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# update layer slices after repairing the single regions
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$layer->make_slices;
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}
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# remove empty layers from bottom
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while (@{$self->layers} && !@{$self->get_layer(0)->slices}) {
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shift @{$self->layers};
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for (my $i = 0; $i <= $#{$self->layers}; $i++) {
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$self->get_layer($i)->set_id( $self->get_layer($i)->id-1 );
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}
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}
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# simplify slices if required
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if ($self->print->config->resolution) {
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$self->_simplify_slices(scale($self->print->config->resolution));
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}
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die "No layers were detected. You might want to repair your STL file(s) or check their size and retry.\n"
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if !@{$self->layers};
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$self->set_typed_slices(0);
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$self->set_step_done(STEP_SLICE);
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}
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sub _slice_region {
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my ($self, $region_id, $z, $modifier) = @_;
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return [] if !@{$self->get_region_volumes($region_id)};
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# compose mesh
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my $mesh;
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foreach my $volume_id (@{ $self->get_region_volumes($region_id) }) {
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my $volume = $self->model_object->volumes->[$volume_id];
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next if $volume->modifier && !$modifier;
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next if !$volume->modifier && $modifier;
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if (defined $mesh) {
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$mesh->merge($volume->mesh);
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} else {
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$mesh = $volume->mesh->clone;
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}
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}
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return if !defined $mesh;
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# transform mesh
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# we ignore the per-instance transformations currently and only
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# consider the first one
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$self->model_object->instances->[0]->transform_mesh($mesh, 1);
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# align mesh to Z = 0 (it should be already aligned actually) and apply XY shift
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$mesh->translate((map unscale(-$_), @{$self->_copies_shift}), -$self->model_object->bounding_box->z_min);
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# perform actual slicing
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return $mesh->slice($z);
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}
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sub make_perimeters {
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my $self = shift;
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# prerequisites
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$self->slice;
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return if $self->step_done(STEP_PERIMETERS);
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$self->set_step_started(STEP_PERIMETERS);
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$self->print->status_cb->(20, "Generating perimeters");
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# merge slices if they were split into types
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if ($self->typed_slices) {
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$_->merge_slices for @{$self->layers};
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$self->set_typed_slices(0);
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$self->invalidate_step(STEP_PREPARE_INFILL);
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}
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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 at least one perimeter is overlapping
|
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# but we don't generate any extra perimeter if fill density is zero, as they would be floating
|
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# inside the object - infill_only_where_needed should be the method of choice for printing
|
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# hollow objects
|
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for my $region_id (0 .. ($self->print->region_count-1)) {
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my $region = $self->print->regions->[$region_id];
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my $region_perimeters = $region->config->perimeters;
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next if !$region->config->extra_perimeters;
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next if $region_perimeters == 0;
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next if $region->config->fill_density == 0;
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for my $i (0 .. ($self->layer_count - 2)) {
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my $layerm = $self->get_layer($i)->get_region($region_id);
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my $upper_layerm = $self->get_layer($i+1)->get_region($region_id);
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my $perimeter_spacing = $layerm->flow(FLOW_ROLE_PERIMETER)->scaled_spacing;
|
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my $ext_perimeter_flow = $layerm->flow(FLOW_ROLE_EXTERNAL_PERIMETER);
|
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my $ext_perimeter_width = $ext_perimeter_flow->scaled_width;
|
||
my $ext_perimeter_spacing = $ext_perimeter_flow->scaled_spacing;
|
||
|
||
foreach my $slice (@{$layerm->slices}) {
|
||
while (1) {
|
||
# compute the total thickness of perimeters
|
||
my $perimeters_thickness = $ext_perimeter_width/2 + $ext_perimeter_spacing/2
|
||
+ ($region_perimeters-1 + $slice->extra_perimeters) * $perimeter_spacing;
|
||
|
||
# define a critical area where we don't want the upper slice to fall into
|
||
# (it should either lay over our perimeters or outside this area)
|
||
my $critical_area_depth = $perimeter_spacing*1.5;
|
||
my $critical_area = diff(
|
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offset($slice->expolygon->arrayref, -$perimeters_thickness),
|
||
offset($slice->expolygon->arrayref, -($perimeters_thickness + $critical_area_depth)),
|
||
);
|
||
|
||
# check whether a portion of the upper slices falls inside the critical area
|
||
my $intersection = intersection_ppl(
|
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[ map $_->p, @{$upper_layerm->slices} ],
|
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$critical_area,
|
||
);
|
||
|
||
# only add an additional loop if at least 30% of the slice loop would benefit from it
|
||
my $total_loop_length = sum(map $_->length, map $_->p, @{$upper_layerm->slices}) // 0;
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my $total_intersection_length = sum(map $_->length, @$intersection) // 0;
|
||
last unless $total_intersection_length > $total_loop_length*0.3;
|
||
|
||
if (0) {
|
||
require "Slic3r/SVG.pm";
|
||
Slic3r::SVG::output(
|
||
"extra.svg",
|
||
no_arrows => 1,
|
||
expolygons => union_ex($critical_area),
|
||
polylines => [ map $_->split_at_first_point, map $_->p, @{$upper_layerm->slices} ],
|
||
);
|
||
}
|
||
|
||
$slice->extra_perimeters($slice->extra_perimeters + 1);
|
||
}
|
||
Slic3r::debugf " adding %d more perimeter(s) at layer %d\n",
|
||
$slice->extra_perimeters, $layerm->id
|
||
if $slice->extra_perimeters > 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
Slic3r::parallelize(
|
||
threads => $self->print->config->threads,
|
||
items => sub { 0 .. ($self->layer_count - 1) },
|
||
thread_cb => sub {
|
||
my $q = shift;
|
||
while (defined (my $i = $q->dequeue)) {
|
||
$self->get_layer($i)->make_perimeters;
|
||
}
|
||
},
|
||
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);
|
||
|
||
$self->set_step_done(STEP_PERIMETERS);
|
||
}
|
||
|
||
sub prepare_infill {
|
||
my ($self) = @_;
|
||
|
||
# prerequisites
|
||
$self->make_perimeters;
|
||
|
||
return if $self->step_done(STEP_PREPARE_INFILL);
|
||
$self->set_step_started(STEP_PREPARE_INFILL);
|
||
$self->print->status_cb->(30, "Preparing infill");
|
||
|
||
# this will assign a type (top/bottom/internal) to $layerm->slices
|
||
# and transform $layerm->fill_surfaces from expolygon
|
||
# to typed top/bottom/internal surfaces;
|
||
$self->detect_surfaces_type;
|
||
$self->set_typed_slices(1);
|
||
|
||
# decide what surfaces are to be filled
|
||
$_->prepare_fill_surfaces for map @{$_->regions}, @{$self->layers};
|
||
|
||
# this will detect bridges and reverse bridges
|
||
# and rearrange top/bottom/internal surfaces
|
||
$self->process_external_surfaces;
|
||
|
||
# detect which fill surfaces are near external layers
|
||
# they will be split in internal and internal-solid surfaces
|
||
$self->discover_horizontal_shells;
|
||
$self->clip_fill_surfaces;
|
||
|
||
# the following step needs to be done before combination because it may need
|
||
# to remove only half of the combined infill
|
||
$self->bridge_over_infill;
|
||
|
||
# combine fill surfaces to honor the "infill every N layers" option
|
||
$self->combine_infill;
|
||
|
||
$self->set_step_done(STEP_PREPARE_INFILL);
|
||
}
|
||
|
||
sub infill {
|
||
my ($self) = @_;
|
||
|
||
# prerequisites
|
||
$self->prepare_infill;
|
||
|
||
return if $self->step_done(STEP_INFILL);
|
||
$self->set_step_started(STEP_INFILL);
|
||
$self->print->status_cb->(70, "Infilling layers");
|
||
|
||
Slic3r::parallelize(
|
||
threads => $self->print->config->threads,
|
||
items => sub {
|
||
my @items = (); # [layer_id, region_id]
|
||
for my $region_id (0 .. ($self->print->region_count-1)) {
|
||
push @items, map [$_, $region_id], 0..($self->layer_count - 1);
|
||
}
|
||
@items;
|
||
},
|
||
thread_cb => sub {
|
||
my $q = shift;
|
||
while (defined (my $obj_layer = $q->dequeue)) {
|
||
my ($i, $region_id) = @$obj_layer;
|
||
my $layerm = $self->get_layer($i)->regions->[$region_id];
|
||
$layerm->fills->clear;
|
||
$layerm->fills->append($_) for $self->fill_maker->make_fill($layerm);
|
||
}
|
||
},
|
||
no_threads_cb => sub {
|
||
foreach my $layerm (map @{$_->regions}, @{$self->layers}) {
|
||
$layerm->fills->clear;
|
||
$layerm->fills->append($_) for $self->fill_maker->make_fill($layerm);
|
||
}
|
||
},
|
||
);
|
||
|
||
### we could free memory now, but this would make this step not idempotent
|
||
### $_->fill_surfaces->clear for map @{$_->regions}, @{$object->layers};
|
||
|
||
$self->set_step_done(STEP_INFILL);
|
||
}
|
||
|
||
sub generate_support_material {
|
||
my $self = shift;
|
||
|
||
# prerequisites
|
||
$self->slice;
|
||
|
||
return if $self->step_done(STEP_SUPPORTMATERIAL);
|
||
$self->set_step_started(STEP_SUPPORTMATERIAL);
|
||
|
||
$self->clear_support_layers;
|
||
|
||
if ((!$self->config->support_material && $self->config->raft_layers == 0) || scalar(@{$self->layers}) < 2) {
|
||
$self->set_step_done(STEP_SUPPORTMATERIAL);
|
||
return;
|
||
}
|
||
$self->print->status_cb->(85, "Generating support material");
|
||
|
||
$self->_support_material->generate($self);
|
||
|
||
$self->set_step_done(STEP_SUPPORTMATERIAL);
|
||
}
|
||
|
||
sub _support_material {
|
||
my ($self) = @_;
|
||
|
||
my $first_layer_flow = Slic3r::Flow->new_from_width(
|
||
width => ($self->print->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 ]
|
||
// $self->print->config->nozzle_diameter->[0],
|
||
layer_height => $self->config->get_abs_value('first_layer_height'),
|
||
bridge_flow_ratio => 0,
|
||
);
|
||
|
||
return 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),
|
||
);
|
||
}
|
||
|
||
sub detect_surfaces_type {
|
||
my $self = shift;
|
||
Slic3r::debugf "Detecting solid surfaces...\n";
|
||
|
||
for my $region_id (0 .. ($self->print->region_count-1)) {
|
||
for my $i (0 .. ($self->layer_count - 1)) {
|
||
my $layerm = $self->get_layer($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 ],
|
||
1,
|
||
);
|
||
|
||
# collapse very narrow parts (using the safety offset in the diff is not enough)
|
||
my $offset = $layerm->flow(FLOW_ROLE_EXTERNAL_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)
|
||
# unless internal shells are requested
|
||
my $upper_layer = $i < $self->layer_count - 1 ? $self->get_layer($i+1) : undef;
|
||
my $lower_layer = $i > 0 ? $self->get_layer($i-1) : undef;
|
||
|
||
# find top surfaces (difference between current surfaces
|
||
# of current layer and upper one)
|
||
my @top = ();
|
||
if ($upper_layer) {
|
||
my $upper_slices = $self->config->interface_shells
|
||
? [ map $_->expolygon, @{$upper_layer->regions->[$region_id]->slices} ]
|
||
: $upper_layer->slices;
|
||
|
||
@top = $difference->(
|
||
[ map $_->expolygon, @{$layerm->slices} ],
|
||
$upper_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};
|
||
$_->surface_type(S_TYPE_TOP) for @top;
|
||
}
|
||
|
||
# find bottom surfaces (difference between current surfaces
|
||
# of current layer and lower one)
|
||
my @bottom = ();
|
||
if ($lower_layer) {
|
||
# any surface lying on the void is a true bottom bridge
|
||
push @bottom, $difference->(
|
||
[ map $_->expolygon, @{$layerm->slices} ],
|
||
$lower_layer->slices,
|
||
S_TYPE_BOTTOMBRIDGE,
|
||
);
|
||
|
||
# if we have soluble support material, don't bridge
|
||
if ($self->config->support_material && $self->config->support_material_contact_distance == 0) {
|
||
$_->surface_type(S_TYPE_BOTTOM) for @bottom;
|
||
}
|
||
|
||
# if user requested internal shells, we need to identify surfaces
|
||
# lying on other slices not belonging to this region
|
||
if ($self->config->interface_shells) {
|
||
# non-bridging bottom surfaces: any part of this layer lying
|
||
# on something else, excluding those lying on our own region
|
||
my $supported = intersection_ex(
|
||
[ map @{$_->expolygon}, @{$layerm->slices} ],
|
||
[ map @$_, @{$lower_layer->slices} ],
|
||
);
|
||
push @bottom, $difference->(
|
||
$supported,
|
||
[ map $_->expolygon, @{$lower_layer->regions->[$region_id]->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};
|
||
|
||
# if we have raft layers, consider bottom layer as a bridge
|
||
# just like any other bottom surface lying on the void
|
||
if ($self->config->raft_layers > 0 && $self->config->support_material_contact_distance > 0) {
|
||
$_->surface_type(S_TYPE_BOTTOMBRIDGE) for @bottom;
|
||
} else {
|
||
$_->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)
|
||
my @internal = $difference->(
|
||
[ map $_->expolygon, @{$layerm->slices} ],
|
||
[ map $_->expolygon, @top, @bottom ],
|
||
S_TYPE_INTERNAL,
|
||
);
|
||
|
||
# save surfaces to layer
|
||
$layerm->slices->clear;
|
||
$layerm->slices->append($_) for (@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];
|
||
|
||
# Note: this method should be idempotent, but fill_surfaces gets modified
|
||
# in place. However we're now only using its boundaries (which are invariant)
|
||
# so we're safe. This guarantees idempotence of prepare_infill() also in case
|
||
# that combine_infill() turns some fill_surface into VOID surfaces.
|
||
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,
|
||
);
|
||
$layerm->fill_surfaces->append($_)
|
||
for map Slic3r::Surface->new(expolygon => $_, surface_type => $surface->surface_type),
|
||
@$intersection;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
# Idempotence of this method is guaranteed by the fact that we don't remove things from
|
||
# fill_surfaces but we only turn them into VOID surfaces, thus preserving the boundaries.
|
||
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.
|
||
|
||
# proceed top-down skipping bottom layer
|
||
my $upper_internal = [];
|
||
for my $layer_id (reverse 1..($self->layer_count - 1)) {
|
||
my $layer = $self->get_layer($layer_id);
|
||
my $lower_layer = $self->get_layer($layer_id-1);
|
||
|
||
# detect things that we need to support
|
||
my $overhangs = []; # Polygons
|
||
|
||
# we need to support any solid surface
|
||
push @$overhangs, map $_->p,
|
||
grep $_->is_solid, map @{$_->fill_surfaces}, @{$layer->regions};
|
||
|
||
# we also need to support perimeters when there's at least one full
|
||
# unsupported loop
|
||
{
|
||
# get perimeters area as the difference between slices and fill_surfaces
|
||
my $perimeters = diff(
|
||
[ map @$_, @{$layer->slices} ],
|
||
[ map $_->p, map @{$_->fill_surfaces}, @{$layer->regions} ],
|
||
);
|
||
|
||
# only consider the area that is not supported by lower perimeters
|
||
$perimeters = intersection(
|
||
$perimeters,
|
||
[ map $_->p, map @{$_->fill_surfaces}, @{$lower_layer->regions} ],
|
||
1,
|
||
);
|
||
|
||
# only consider perimeter areas that are at least one extrusion width thick
|
||
my $pw = min(map $_->flow(FLOW_ROLE_PERIMETER)->scaled_width, @{$layer->regions});
|
||
$perimeters = offset2($perimeters, -$pw, +$pw);
|
||
|
||
# append such thick perimeters to the areas that need support
|
||
push @$overhangs, @$perimeters;
|
||
}
|
||
|
||
# find new internal infill
|
||
$upper_internal = my $new_internal = intersection(
|
||
[
|
||
@$overhangs,
|
||
@$upper_internal,
|
||
],
|
||
[
|
||
# our current internal fill boundaries
|
||
map $_->p,
|
||
grep $_->surface_type == S_TYPE_INTERNAL || $_->surface_type == S_TYPE_INTERNALVOID,
|
||
map @{$_->fill_surfaces}, @{$lower_layer->regions}
|
||
],
|
||
);
|
||
|
||
# apply new internal infill to regions
|
||
foreach my $layerm (@{$lower_layer->regions}) {
|
||
my (@internal, @other) = ();
|
||
foreach my $surface (map $_->clone, @{$layerm->fill_surfaces}) {
|
||
if ($surface->surface_type == S_TYPE_INTERNAL || $surface->surface_type == S_TYPE_INTERNALVOID) {
|
||
push @internal, $surface;
|
||
} else {
|
||
push @other, $surface;
|
||
}
|
||
}
|
||
|
||
my @new = map Slic3r::Surface->new(
|
||
expolygon => $_,
|
||
surface_type => S_TYPE_INTERNAL,
|
||
),
|
||
@{intersection_ex(
|
||
[ map $_->p, @internal ],
|
||
$new_internal,
|
||
1,
|
||
)};
|
||
|
||
push @other, map Slic3r::Surface->new(
|
||
expolygon => $_,
|
||
surface_type => S_TYPE_INTERNALVOID,
|
||
),
|
||
@{diff_ex(
|
||
[ map $_->p, @internal ],
|
||
$new_internal,
|
||
1,
|
||
)};
|
||
|
||
# If there are voids it means that our internal infill is not adjacent to
|
||
# perimeters. In this case it would be nice to add a loop around infill to
|
||
# make it more robust and nicer. TODO.
|
||
|
||
$layerm->fill_surfaces->clear;
|
||
$layerm->fill_surfaces->append($_) for (@new, @other);
|
||
}
|
||
}
|
||
}
|
||
|
||
sub process_external_surfaces {
|
||
my ($self) = @_;
|
||
|
||
for my $region_id (0 .. ($self->print->region_count-1)) {
|
||
$self->get_layer(0)->regions->[$region_id]->process_external_surfaces(undef);
|
||
for my $i (1 .. ($self->layer_count - 1)) {
|
||
$self->get_layer($i)->regions->[$region_id]->process_external_surfaces($self->get_layer($i-1));
|
||
}
|
||
}
|
||
}
|
||
|
||
sub discover_horizontal_shells {
|
||
my $self = shift;
|
||
|
||
Slic3r::debugf "==> DISCOVERING HORIZONTAL SHELLS\n";
|
||
|
||
for my $region_id (0 .. ($self->print->region_count-1)) {
|
||
for (my $i = 0; $i < $self->layer_count; $i++) {
|
||
my $layerm = $self->get_layer($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, S_TYPE_BOTTOMBRIDGE) {
|
||
# 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_layerm = $self->get_layer($n)->regions->[$region_id];
|
||
my $neighbor_fill_surfaces = $neighbor_layerm->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;
|
||
|
||
if ($layerm->config->fill_density == 0) {
|
||
# if we're printing a hollow object we discard any solid shell thinner
|
||
# than a perimeter width, since it's probably just crossing a sloping wall
|
||
# and it's not wanted in a hollow print even if it would make sense when
|
||
# obeying the solid shell count option strictly (DWIM!)
|
||
my $margin = $neighbor_layerm->flow(FLOW_ROLE_EXTERNAL_PERIMETER)->scaled_width;
|
||
my $too_narrow = diff(
|
||
$new_internal_solid,
|
||
offset2($new_internal_solid, -$margin, +$margin, CLIPPER_OFFSET_SCALE, JT_MITER, 5),
|
||
1,
|
||
);
|
||
$new_internal_solid = $solid = diff(
|
||
$new_internal_solid,
|
||
$too_narrow,
|
||
) if @$too_narrow;
|
||
}
|
||
|
||
# make sure the new internal solid is wide enough, as it might get collapsed
|
||
# when spacing is added in Fill.pm
|
||
{
|
||
my $margin = 3 * $layerm->flow(FLOW_ROLE_SOLID_INFILL)->scaled_width; # require at least this size
|
||
# 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 $too_narrow = diff(
|
||
$new_internal_solid,
|
||
offset2($new_internal_solid, -$margin, +$margin, CLIPPER_OFFSET_SCALE, JT_MITER, 5),
|
||
1,
|
||
);
|
||
|
||
if (@$too_narrow) {
|
||
# grow the collapsing parts and add the extra area to the neighbor layer
|
||
# as well as to our original surfaces so that we support this
|
||
# additional area in the next shell too
|
||
|
||
# make sure our grown surfaces don't exceed the fill area
|
||
my @grown = @{intersection(
|
||
offset($too_narrow, +$margin),
|
||
[ map $_->p, @neighbor_fill_surfaces ],
|
||
)};
|
||
$new_internal_solid = $solid = [ @grown, @$new_internal_solid ];
|
||
}
|
||
}
|
||
|
||
# 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;
|
||
$neighbor_fill_surfaces->append($_)
|
||
for map Slic3r::Surface->new(expolygon => $_, surface_type => S_TYPE_INTERNAL),
|
||
@$internal;
|
||
|
||
# assign new internal-solid surfaces to layer
|
||
$neighbor_fill_surfaces->append($_)
|
||
for 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) || $_->is_bottom } @neighbor_fill_surfaces)->group}) {
|
||
my $solid_surfaces = diff_ex(
|
||
[ map $_->p, @$s ],
|
||
[ map @$_, @$internal_solid, @$internal ],
|
||
1,
|
||
);
|
||
$neighbor_fill_surfaces->append($_)
|
||
for map $s->[0]->clone(expolygon => $_), @$solid_surfaces;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
# combine fill surfaces across layers
|
||
# Idempotence of this method is guaranteed by the fact that we don't remove things from
|
||
# fill_surfaces but we only turn them into VOID surfaces, thus preserving the boundaries.
|
||
sub combine_infill {
|
||
my $self = shift;
|
||
|
||
# define the type used for voids
|
||
my %voidtype = (
|
||
&S_TYPE_INTERNAL() => S_TYPE_INTERNALVOID,
|
||
);
|
||
|
||
# work on each region separately
|
||
for my $region_id (0 .. ($self->print->region_count-1)) {
|
||
my $region = $self->print->get_region($region_id);
|
||
my $every = $region->config->infill_every_layers;
|
||
next unless $every > 1 && $region->config->fill_density > 0;
|
||
|
||
# limit the number of combined layers to the maximum height allowed by this regions' nozzle
|
||
my $nozzle_diameter = min(
|
||
$self->print->config->get_at('nozzle_diameter', $region->config->infill_extruder-1),
|
||
$self->print->config->get_at('nozzle_diameter', $region->config->solid_infill_extruder-1),
|
||
);
|
||
|
||
# define the combinations
|
||
my %combine = (); # layer_idx => number of additional combined lower layers
|
||
{
|
||
my $current_height = my $layers = 0;
|
||
for my $layer_idx (0 .. ($self->layer_count-1)) {
|
||
my $layer = $self->get_layer($layer_idx);
|
||
next if $layer->id == 0; # skip first print layer (which may not be first layer in array because of raft)
|
||
my $height = $layer->height;
|
||
|
||
# check whether the combination of this layer with the lower layers' buffer
|
||
# would exceed max layer height or max combined layer count
|
||
if ($current_height + $height >= $nozzle_diameter || $layers >= $every) {
|
||
# append combination to lower layer
|
||
$combine{$layer_idx-1} = $layers;
|
||
$current_height = $layers = 0;
|
||
}
|
||
|
||
$current_height += $height;
|
||
$layers++;
|
||
}
|
||
|
||
# append lower layers (if any) to uppermost layer
|
||
$combine{$self->layer_count-1} = $layers;
|
||
}
|
||
|
||
# loop through layers to which we have assigned layers to combine
|
||
for my $layer_idx (sort keys %combine) {
|
||
next unless $combine{$layer_idx} > 1;
|
||
|
||
# get all the LayerRegion objects to be combined
|
||
my @layerms = map $self->get_layer($_)->get_region($region_id),
|
||
($layer_idx - ($combine{$layer_idx}-1) .. $layer_idx);
|
||
|
||
# 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'),
|
||
$layer_idx-($every-1), $layer_idx;
|
||
|
||
# $intersection now contains the regions that can be combined across the full amount of layers
|
||
# so let's remove those areas from all layers
|
||
|
||
my @intersection_with_clearance = map @{$_->offset(
|
||
$layerms[-1]->flow(FLOW_ROLE_SOLID_INFILL)->scaled_width / 2
|
||
+ $layerms[-1]->flow(FLOW_ROLE_PERIMETER)->scaled_width / 2
|
||
# Because fill areas for rectilinear and honeycomb are grown
|
||
# later to overlap perimeters, we need to counteract that too.
|
||
+ (($type == S_TYPE_INTERNALSOLID || $region->config->fill_pattern =~ /(rectilinear|honeycomb)/)
|
||
? $layerms[-1]->flow(FLOW_ROLE_SOLID_INFILL)->scaled_width
|
||
: 0)
|
||
)}, @$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 == $self->get_layer($layer_idx)->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 @new_this_type,
|
||
map Slic3r::Surface->new(expolygon => $_, surface_type => $voidtype{$type}),
|
||
@{intersection_ex(
|
||
[ map @{$_->expolygon}, @this_type ],
|
||
[ @intersection_with_clearance ],
|
||
)};
|
||
}
|
||
|
||
$layerm->fill_surfaces->clear;
|
||
$layerm->fill_surfaces->append($_) for (@new_this_type, @other_types);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
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 || $self->config->extrusion_width,
|
||
role => $role,
|
||
nozzle_diameter => $self->print->config->nozzle_diameter->[$extruder-1] // $self->print->config->nozzle_diameter->[0],
|
||
layer_height => $self->config->layer_height,
|
||
bridge_flow_ratio => 0,
|
||
);
|
||
}
|
||
|
||
1;
|