3DPrinting/PrusaSlicer-NonPlainar
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Use the same bridging logic for "reverse bridges" (top surfaces)

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Alessandro Ranellucci 2011-11-17 10:34:40 +01:00
parent 6ec7069f8e
commit 580f42c1de
2 changed files with 48 additions and 40 deletions
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83
lib/Slic3r/Layer.pm
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@ -4,7 +4,7 @@ use Moo;
use Math::Clipper ':all'; use Math::Clipper ':all';
use Slic3r::Geometry qw(polygon_lines points_coincide angle3points polyline_lines nearest_point use Slic3r::Geometry qw(polygon_lines points_coincide angle3points polyline_lines nearest_point
line_length collinear X Y A B PI); line_length collinear X Y A B PI);
use Slic3r::Geometry::Clipper qw(safety_offset union_ex PFT_EVENODD); use Slic3r::Geometry::Clipper qw(union_ex diff_ex intersection_ex PFT_EVENODD);
use XXX; use XXX;
# a sequential number of layer, starting at 0 # a sequential number of layer, starting at 0
@ -347,28 +347,29 @@ sub remove_small_perimeters {
# make bridges printable # make bridges printable
sub process_bridges { sub process_bridges {
my $self = shift; my $self = shift;
return if $self->id == 0;
# a bottom surface on a layer > 0 is either a bridge or a overhang # a bottom surface on a layer > 0 is either a bridge or a overhang
# or a combination of both # or a combination of both; any top surface is a candidate for
# reverse bridge processing
my @solid_surfaces = grep {
($_->surface_type eq 'bottom' && $self->id > 0) || $_->surface_type eq 'top'
} @{$self->surfaces} or return;
my @bottom_surfaces = grep $_->surface_type eq 'bottom', @{$self->surfaces} or return;
my @supporting_surfaces = grep $_->surface_type =~ /internal/, @{$self->surfaces}; my @supporting_surfaces = grep $_->surface_type =~ /internal/, @{$self->surfaces};
SURFACE: foreach my $surface (@bottom_surfaces) { SURFACE: foreach my $surface (@solid_surfaces) {
# since we can't print concave bridges, we transform the surface # ignore holes in bridges;
# in a convex polygon; this will print thin membranes eventually
my $surface_p = $surface->contour->p;
# offset the surface a bit to avoid approximation issues when doing the # offset the surface a bit to avoid approximation issues when doing the
# intersection below (this is to make sure we overlap with supporting # intersection below (this is to make sure we overlap with supporting
# surfaces, otherwise a little gap will result from intersection) # surfaces, otherwise a little gap will result from intersection)
$surface_p = safety_offset([$surface_p])->[0]; my $contour = $surface->expolygon->contour->safety_offset;
my $description = $surface->surface_type eq 'bottom' ? 'bridge/overhang' : 'reverse bridge';
#use Slic3r::SVG; #use Slic3r::SVG;
#Slic3r::SVG::output(undef, "bridge.svg", #Slic3r::SVG::output(undef, "bridge.svg",
# green_polygons => [ map $_->p, @supporting_surfaces ], # green_polygons => [ map $_->p, @supporting_surfaces ],
# red_polygons => [ $surface_p ], # red_polygons => [ $contour ],
#); #);
# find all supported edges (as polylines, thus keeping notion of # find all supported edges (as polylines, thus keeping notion of
@ -376,7 +377,7 @@ sub process_bridges {
my @supported_polylines = (); my @supported_polylines = ();
{ {
my @current_polyline = (); my @current_polyline = ();
EDGE: foreach my $edge (Slic3r::Geometry::polygon_lines($surface_p)) { EDGE: foreach my $edge ($contour->lines) {
for my $supporting_surface (@supporting_surfaces) { for my $supporting_surface (@supporting_surfaces) {
local $Slic3r::Geometry::epsilon = 1E+7; local $Slic3r::Geometry::epsilon = 1E+7;
if (Slic3r::Geometry::polygon_has_subsegment($supporting_surface->contour->p, $edge)) { if (Slic3r::Geometry::polygon_has_subsegment($supporting_surface->contour->p, $edge)) {
@ -394,12 +395,12 @@ sub process_bridges {
# defensive programming, this shouldn't happen # defensive programming, this shouldn't happen
if (@supported_polylines == 0) { if (@supported_polylines == 0) {
Slic3r::debugf "Found bridge/overhang with no supports on layer %d; ignoring\n", $self->id; Slic3r::debugf "Found $description with no supports on layer %d; ignoring\n", $self->id;
next SURFACE; next SURFACE;
} }
if (@supported_polylines == 1) { if (@supported_polylines == 1) {
Slic3r::debugf "Found bridge/overhang with only one support on layer %d; ignoring\n", $self->id; Slic3r::debugf "Found $description with only one support on layer %d; ignoring\n", $self->id;
next SURFACE; next SURFACE;
} }
@ -437,17 +438,15 @@ sub process_bridges {
# now, extend our bridge by taking a portion of supporting surfaces # now, extend our bridge by taking a portion of supporting surfaces
{ {
# offset the bridge by the specified amount of mm # offset the bridge by the specified amount of mm
my $bridge_offset = ${ offset([$surface_p], $Slic3r::bridge_overlap / $Slic3r::resolution, $Slic3r::resolution * 100, JT_MITER, 2) }[0]; my $bridge_offset = ${ offset([$contour], $Slic3r::bridge_overlap / $Slic3r::resolution, $Slic3r::resolution * 100, JT_MITER, 2) }[0];
# calculate the new bridge # calculate the new bridge
my $clipper = Math::Clipper->new; my $intersection = intersection_ex(
$clipper->add_subject_polygon($surface_p); [ $contour, map $_->p, @supporting_neighbor_surfaces ],
$clipper->add_subject_polygons([ map $_->p, @supporting_neighbor_surfaces ]); [ $bridge_offset ],
$clipper->add_clip_polygon($bridge_offset); );
my $intersection = $clipper->execute(CT_INTERSECTION, PFT_NONZERO, PFT_NONZERO); push @{$self->bridges}, map Slic3r::Surface::Bridge->cast_from_expolygon($_,
surface_type => $surface->surface_type,
push @{$self->bridges}, map Slic3r::Surface::Bridge->cast_from_polygon($_,
surface_type => 'bottom',
bridge_angle => $bridge_angle, bridge_angle => $bridge_angle,
), @$intersection; ), @$intersection;
} }
@ -463,18 +462,26 @@ sub detect_perimeter_surfaces {
if (!@{$self->bridges}) { if (!@{$self->bridges}) {
push @{$self->perimeter_surfaces}, @{$self->surfaces}; push @{$self->perimeter_surfaces}, @{$self->surfaces};
} else { } else {
my $clipper = Math::Clipper->new; my $union = union_ex([
$clipper->add_subject_polygons([ map $_->p, grep $_->surface_type =~ /internal/, @{$self->surfaces} ]); (map $_->p, grep $_->surface_type =~ /internal/, @{$self->surfaces}),
$clipper->add_clip_polygons([ map $_->p, @{$self->bridges} ]); (map $_->p, @{$self->bridges}),
my $union = $clipper->ex_execute(CT_UNION, PFT_NONZERO, PFT_NONZERO); ]);
# schedule perimeters for internal surfaces merged with bridges
push @{$self->perimeter_surfaces}, push @{$self->perimeter_surfaces},
map Slic3r::Surface->cast_from_expolygon($_, surface_type => 'internal'), map Slic3r::Surface->cast_from_expolygon($_, surface_type => 'internal'),
@$union; @$union;
push @{$self->perimeter_surfaces}, # schedule perimeters for the remaining surfaces
grep $_->surface_type !~ /internal/ && ($_->surface_type ne 'bottom' || $self->id == 0), foreach my $type (qw(top bottom)) {
@{$self->surfaces}; my $diff = diff_ex(
[ map $_->p, grep $_->surface_type eq $type, @{$self->surfaces} ],
[ map @$_, @$union ],
);
push @{$self->perimeter_surfaces},
map Slic3r::Surface->cast_from_expolygon($_, surface_type => $type),
@$diff;
}
} }
} }
@ -482,29 +489,25 @@ sub detect_perimeter_surfaces {
sub split_bridges_fills { sub split_bridges_fills {
my $self = shift; my $self = shift;
my $clipper = Math::Clipper->new;
foreach my $surfaces (@{$self->fill_surfaces}) { foreach my $surfaces (@{$self->fill_surfaces}) {
my @surfaces = @$surfaces; my @surfaces = @$surfaces;
@$surfaces = (); @$surfaces = ();
# intersect fill_surfaces with bridges to get actual bridges # intersect fill_surfaces with bridges to get actual bridges
foreach my $bridge (@{$self->bridges}) { foreach my $bridge (@{$self->bridges}) {
$clipper->clear; my $intersection = intersection_ex(
$clipper->add_subject_polygons([ map $_->p, @surfaces ]); [ map $_->p, @surfaces ],
$clipper->add_clip_polygon($bridge->contour->p); [ $bridge->contour->p ],
my $intersection = $clipper->ex_execute(CT_INTERSECTION, PFT_NONZERO, PFT_NONZERO); );
push @$surfaces, map Slic3r::Surface::Bridge->cast_from_expolygon($_, push @$surfaces, map Slic3r::Surface::Bridge->cast_from_expolygon($_,
surface_type => 'bottom', surface_type => $bridge->surface_type,
bridge_angle => $bridge->bridge_angle, bridge_angle => $bridge->bridge_angle,
), @$intersection; ), @$intersection;
} }
# difference between fill_surfaces and bridges are the other surfaces # difference between fill_surfaces and bridges are the other surfaces
foreach my $surface (@surfaces) { foreach my $surface (@surfaces) {
$clipper->clear; my $difference = diff_ex([ $surface->p ], [ map $_->contour->p, @{$self->bridges} ]);
$clipper->add_subject_polygons([ $surface->p ]);
$clipper->add_clip_polygons([ map $_->contour->p, @{$self->bridges} ]);
my $difference = $clipper->ex_execute(CT_DIFFERENCE, PFT_NONZERO, PFT_NONZERO);
push @$surfaces, map Slic3r::Surface->cast_from_expolygon($_, push @$surfaces, map Slic3r::Surface->cast_from_expolygon($_,
surface_type => $surface->surface_type), @$difference; surface_type => $surface->surface_type), @$difference;
} }

5
lib/Slic3r/Polygon.pm
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@ -70,4 +70,9 @@ sub area {
return Slic3r::Geometry::Clipper::area($self); return Slic3r::Geometry::Clipper::area($self);
} }
sub safety_offset {
my $self = shift;
return (ref $self)->new(Slic3r::Geometry::Clipper::safety_offset([$self])->[0]);
}
1; 1;