MotionPlanner::MotionPlanner(const ExPolygons &islands)
: initialized(false)
{
ExPolygons expp;
for (ExPolygons::const_iterator island = islands.begin(); island != islands.end(); ++island)
island->simplify(SCALED_EPSILON, &expp);
for (ExPolygons::const_iterator island = expp.begin(); island != expp.end(); ++island)
this->islands.push_back(MotionPlannerEnv(*island));
}
inline bool expolygons_contain(ExPolygons &expolys, const Point &pt)
{
for (ExPolygons::iterator p = expolys.begin(); p != expolys.end(); ++p)
if (p->contains(pt))
return true;
return false;
}
// Count a nuber of polygons stored inside the vector of expolygons.
// Useful for allocating space for polygons when converting expolygons to polygons.
inline size_t number_polygons(const ExPolygons &expolys)
{
size_t n_polygons = 0;
for (ExPolygons::const_iterator it = expolys.begin(); it != expolys.end(); ++ it)
n_polygons += it->holes.size() + 1;
return n_polygons;
}
inline void polygons_append(Polygons &dst, const ExPolygons &src)
{
dst.reserve(dst.size() + number_polygons(src));
for (ExPolygons::const_iterator it = src.begin(); it != src.end(); ++ it) {
dst.push_back(it->contour);
dst.insert(dst.end(), it->holes.begin(), it->holes.end());
}
}
inline Polygons to_polygons(const ExPolygons &src)
{
Polygons polygons;
polygons.reserve(number_polygons(src));
for (ExPolygons::const_iterator it = src.begin(); it != src.end(); ++it) {
polygons.push_back(it->contour);
polygons.insert(polygons.end(), it->holes.begin(), it->holes.end());
}
return polygons;
}
void
LayerRegion::merge_slices()
{
// without safety offset, artifacts are generated (GH #2494)
ExPolygons expp = union_ex((Polygons)this->slices, true);
this->slices.surfaces.clear();
this->slices.surfaces.reserve(expp.size());
for (ExPolygons::const_iterator expoly = expp.begin(); expoly != expp.end(); ++expoly)
this->slices.surfaces.push_back(Surface(stInternal, *expoly));
}
inline Lines to_lines(const ExPolygons &src)
{
size_t n_lines = 0;
for (ExPolygons::const_iterator it_expoly = src.begin(); it_expoly != src.end(); ++ it_expoly) {
n_lines += it_expoly->contour.points.size();
for (size_t i = 0; i < it_expoly->holes.size(); ++ i)
n_lines += it_expoly->holes[i].points.size();
}
Lines lines;
lines.reserve(n_lines);
for (ExPolygons::const_iterator it_expoly = src.begin(); it_expoly != src.end(); ++ it_expoly) {
for (size_t i = 0; i <= it_expoly->holes.size(); ++ i) {
const Points &points = ((i == 0) ? it_expoly->contour : it_expoly->holes[i - 1]).points;
for (Points::const_iterator it = points.begin(); it != points.end()-1; ++it)
lines.push_back(Line(*it, *(it + 1)));
lines.push_back(Line(points.back(), points.front()));
}
}
return lines;
}
void
SLAPrint::_infill_layer(size_t i, const Fill* _fill)
{
Layer &layer = this->layers[i];
const float shell_thickness = this->config.get_abs_value("perimeter_extrusion_width", this->config.layer_height.value);
// In order to detect what regions of this layer need to be solid,
// perform an intersection with layers within the requested shell thickness.
Polygons internal = layer.slices;
for (size_t j = 0; j < this->layers.size(); ++j) {
const Layer &other = this->layers[j];
if (abs(other.print_z - layer.print_z) > shell_thickness) continue;
if (j == 0 || j == this->layers.size()-1) {
internal.clear();
break;
} else if (i != j) {
internal = intersection(internal, other.slices);
if (internal.empty()) break;
}
}
// If we have no internal infill, just print the whole layer as a solid slice.
if (internal.empty()) return;
layer.solid = false;
const Polygons infill = offset(layer.slices, -scale_(shell_thickness));
// Generate solid infill
layer.solid_infill << diff_ex(infill, internal, true);
// Generate internal infill
{
std::auto_ptr<Fill> fill(_fill->clone());
fill->layer_id = i;
fill->z = layer.print_z;
ExtrusionPath templ(erInternalInfill);
templ.width = fill->spacing;
const ExPolygons internal_ex = intersection_ex(infill, internal);
for (ExPolygons::const_iterator it = internal_ex.begin(); it != internal_ex.end(); ++it) {
Polylines polylines = fill->fill_surface(Surface(stInternal, *it));
layer.infill.append(polylines, templ);
}
}
// Generate perimeter(s).
layer.perimeters << diff_ex(
layer.slices,
offset(layer.slices, -scale_(shell_thickness))
);
}
ExtrusionEntityCollection
PerimeterGenerator::_fill_gaps(double min, double max, double w,
const Polygons &gaps) const
{
ExtrusionEntityCollection coll;
min *= (1 - INSET_OVERLAP_TOLERANCE);
ExPolygons curr = diff_ex(
offset2(gaps, -min/2, +min/2),
offset2(gaps, -max/2, +max/2),
true
);
Polylines polylines;
for (ExPolygons::const_iterator ex = curr.begin(); ex != curr.end(); ++ex)
ex->medial_axis(max, min/2, &polylines);
if (polylines.empty())
return coll;
#ifdef SLIC3R_DEBUG
if (!curr.empty())
printf(" %zu gaps filled with extrusion width = %f\n", curr.size(), w);
#endif
//my $flow = $layerm->flow(FLOW_ROLE_SOLID_INFILL, 0, $w);
Flow flow(
w, this->layer_height, this->solid_infill_flow.nozzle_diameter
);
double mm3_per_mm = flow.mm3_per_mm();
for (Polylines::const_iterator p = polylines.begin(); p != polylines.end(); ++p) {
ExtrusionPath path(erGapFill);
path.polyline = *p;
path.mm3_per_mm = mm3_per_mm;
path.width = flow.width;
path.height = this->layer_height;
if (p->is_valid() && p->first_point().coincides_with(p->last_point())) {
// since medial_axis() now returns only Polyline objects, detect loops here
ExtrusionLoop loop;
loop.paths.push_back(path);
coll.append(loop);
} else {
coll.append(path);
}
}
return coll;
}
void
SurfaceCollection::simplify(double tolerance)
{
Surfaces ss;
for (Surfaces::const_iterator it_s = this->surfaces.begin(); it_s != this->surfaces.end(); ++it_s) {
ExPolygons expp;
it_s->expolygon.simplify(tolerance, expp);
for (ExPolygons::const_iterator it_e = expp.begin(); it_e != expp.end(); ++it_e) {
Surface s = *it_s;
s.expolygon = *it_e;
ss.push_back(s);
}
}
this->surfaces = ss;
}
Surfaces
offset(const Surface &surface, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ExPolygons expp = offset_ex(surface.expolygon, delta, scale, joinType, miterLimit);
// clone the input surface for each expolygon we got
Surfaces retval;
retval.reserve(expp.size());
for (ExPolygons::iterator it = expp.begin(); it != expp.end(); ++it) {
Surface s = surface; // clone
s.expolygon = *it;
retval.push_back(s);
}
return retval;
}
inline Polylines to_polylines(const ExPolygons &src)
{
Polylines polylines;
polylines.assign(number_polygons(src), Polyline());
size_t idx = 0;
for (ExPolygons::const_iterator it = src.begin(); it != src.end(); ++it) {
Polyline &pl = polylines[idx ++];
pl.points = it->contour.points;
pl.points.push_back(pl.points.front());
for (Polygons::const_iterator ith = it->holes.begin(); ith != it->holes.end(); ++ith) {
Polyline &pl = polylines[idx ++];
pl.points = ith->points;
pl.points.push_back(ith->points.front());
}
}
assert(idx == polylines.size());
return polylines;
}
inline void expolygons_append(ExPolygons &dst, const ExPolygons &src)
{
dst.insert(dst.end(), src.begin(), src.end());
}
void
PerimeterGenerator::process()
{
// other perimeters
this->_mm3_per_mm = this->perimeter_flow.mm3_per_mm();
coord_t pwidth = this->perimeter_flow.scaled_width();
coord_t pspacing = this->perimeter_flow.scaled_spacing();
// external perimeters
this->_ext_mm3_per_mm = this->ext_perimeter_flow.mm3_per_mm();
coord_t ext_pwidth = this->ext_perimeter_flow.scaled_width();
coord_t ext_pspacing = this->ext_perimeter_flow.scaled_spacing();
coord_t ext_pspacing2 = this->ext_perimeter_flow.scaled_spacing(this->perimeter_flow);
// overhang perimeters
this->_mm3_per_mm_overhang = this->overhang_flow.mm3_per_mm();
// solid infill
coord_t ispacing = this->solid_infill_flow.scaled_spacing();
coord_t gap_area_threshold = pwidth * pwidth;
// Calculate the minimum required spacing between two adjacent traces.
// This should be equal to the nominal flow spacing but we experiment
// with some tolerance in order to avoid triggering medial axis when
// some squishing might work. Loops are still spaced by the entire
// flow spacing; this only applies to collapsing parts.
// For ext_min_spacing we use the ext_pspacing calculated for two adjacent
// external loops (which is the correct way) instead of using ext_pspacing2
// which is the spacing between external and internal, which is not correct
// and would make the collapsing (thus the details resolution) dependent on
// internal flow which is unrelated.
coord_t min_spacing = pspacing * (1 - INSET_OVERLAP_TOLERANCE);
coord_t ext_min_spacing = ext_pspacing * (1 - INSET_OVERLAP_TOLERANCE);
// prepare grown lower layer slices for overhang detection
if (this->lower_slices != NULL && this->config->overhangs) {
// We consider overhang any part where the entire nozzle diameter is not supported by the
// lower layer, so we take lower slices and offset them by half the nozzle diameter used
// in the current layer
double nozzle_diameter = this->print_config->nozzle_diameter.get_at(this->config->perimeter_extruder-1);
this->_lower_slices_p = offset(*this->lower_slices, scale_(+nozzle_diameter/2));
}
// we need to process each island separately because we might have different
// extra perimeters for each one
for (Surfaces::const_iterator surface = this->slices->surfaces.begin();
surface != this->slices->surfaces.end(); ++surface) {
// detect how many perimeters must be generated for this island
signed short loop_number = this->config->perimeters + surface->extra_perimeters;
loop_number--; // 0-indexed loops
Polygons gaps;
Polygons last = surface->expolygon.simplify_p(SCALED_RESOLUTION);
if (loop_number >= 0) { // no loops = -1
std::vector<PerimeterGeneratorLoops> contours(loop_number+1); // depth => loops
std::vector<PerimeterGeneratorLoops> holes(loop_number+1); // depth => loops
Polylines thin_walls;
// we loop one time more than needed in order to find gaps after the last perimeter was applied
for (signed short i = 0; i <= loop_number+1; ++i) { // outer loop is 0
Polygons offsets;
if (i == 0) {
// the minimum thickness of a single loop is:
// ext_width/2 + ext_spacing/2 + spacing/2 + width/2
if (this->config->thin_walls) {
offsets = offset2(
last,
-(ext_pwidth/2 + ext_min_spacing/2 - 1),
+(ext_min_spacing/2 - 1)
);
} else {
offsets = offset(last, -ext_pwidth/2);
}
// look for thin walls
if (this->config->thin_walls) {
Polygons diffpp = diff(
last,
offset(offsets, +ext_pwidth/2),
true // medial axis requires non-overlapping geometry
);
// the following offset2 ensures almost nothing in @thin_walls is narrower than $min_width
// (actually, something larger than that still may exist due to mitering or other causes)
coord_t min_width = ext_pwidth / 2;
ExPolygons expp = offset2_ex(diffpp, -min_width/2, +min_width/2);
// the maximum thickness of our thin wall area is equal to the minimum thickness of a single loop
Polylines pp;
for (ExPolygons::const_iterator ex = expp.begin(); ex != expp.end(); ++ex)
ex->medial_axis(ext_pwidth + ext_pspacing2, min_width, &pp);
double threshold = ext_pwidth * 2;
for (Polylines::const_iterator p = pp.begin(); p != pp.end(); ++p) {
if (p->length() > threshold) {
thin_walls.push_back(*p);
}
}
#ifdef DEBUG
printf(" %zu thin walls detected\n", thin_walls.size());
#endif
/*
if (false) {
require "Slic3r/SVG.pm";
Slic3r::SVG::output(
"medial_axis.svg",
no_arrows => 1,
#expolygons => \@expp,
polylines => \@thin_walls,
);
}
*/
}
} else {
coord_t distance = (i == 1) ? ext_pspacing2 : pspacing;
if (this->config->thin_walls) {
offsets = offset2(
last,
-(distance + min_spacing/2 - 1),
+(min_spacing/2 - 1)
);
} else {
offsets = offset(
last,
-distance
);
}
// look for gaps
if (this->config->gap_fill_speed.value > 0 && this->config->fill_density.value > 0) {
// not using safety offset here would "detect" very narrow gaps
// (but still long enough to escape the area threshold) that gap fill
// won't be able to fill but we'd still remove from infill area
ExPolygons diff_expp = diff_ex(
offset(last, -0.5*distance),
offset(offsets, +0.5*distance + 10) // safety offset
);
for (ExPolygons::const_iterator ex = diff_expp.begin(); ex != diff_expp.end(); ++ex) {
if (fabs(ex->area()) >= gap_area_threshold) {
Polygons pp = *ex;
gaps.insert(gaps.end(), pp.begin(), pp.end());
}
}
}
}
if (offsets.empty()) break;
if (i > loop_number) break; // we were only looking for gaps this time
last = offsets;
for (Polygons::const_iterator polygon = offsets.begin(); polygon != offsets.end(); ++polygon) {
PerimeterGeneratorLoop loop(*polygon, i);
loop.is_contour = polygon->is_counter_clockwise();
if (loop.is_contour) {
contours[i].push_back(loop);
} else {
holes[i].push_back(loop);
}
}
}
// nest loops: holes first
for (signed short d = 0; d <= loop_number; ++d) {
PerimeterGeneratorLoops &holes_d = holes[d];
// loop through all holes having depth == d
for (signed short i = 0; i < holes_d.size(); ++i) {
const PerimeterGeneratorLoop &loop = holes_d[i];
// find the hole loop that contains this one, if any
for (signed short t = d+1; t <= loop_number; ++t) {
for (signed short j = 0; j < holes[t].size(); ++j) {
PerimeterGeneratorLoop &candidate_parent = holes[t][j];
if (candidate_parent.polygon.contains(loop.polygon.first_point())) {
candidate_parent.children.push_back(loop);
holes_d.erase(holes_d.begin() + i);
--i;
goto NEXT_LOOP;
}
}
}
// if no hole contains this hole, find the contour loop that contains it
for (signed short t = loop_number; t >= 0; --t) {
for (signed short j = 0; j < contours[t].size(); ++j) {
PerimeterGeneratorLoop &candidate_parent = contours[t][j];
if (candidate_parent.polygon.contains(loop.polygon.first_point())) {
candidate_parent.children.push_back(loop);
holes_d.erase(holes_d.begin() + i);
--i;
goto NEXT_LOOP;
}
}
}
NEXT_LOOP: ;
}
}
// nest contour loops
for (signed short d = loop_number; d >= 1; --d) {
PerimeterGeneratorLoops &contours_d = contours[d];
// loop through all contours having depth == d
for (signed short i = 0; i < contours_d.size(); ++i) {
const PerimeterGeneratorLoop &loop = contours_d[i];
// find the contour loop that contains it
for (signed short t = d-1; t >= 0; --t) {
for (signed short j = 0; j < contours[t].size(); ++j) {
PerimeterGeneratorLoop &candidate_parent = contours[t][j];
if (candidate_parent.polygon.contains(loop.polygon.first_point())) {
candidate_parent.children.push_back(loop);
contours_d.erase(contours_d.begin() + i);
--i;
goto NEXT_CONTOUR;
}
}
}
NEXT_CONTOUR: ;
}
}
// at this point, all loops should be in contours[0]
ExtrusionEntityCollection entities = this->_traverse_loops(contours.front(), thin_walls);
// if brim will be printed, reverse the order of perimeters so that
// we continue inwards after having finished the brim
// TODO: add test for perimeter order
if (this->config->external_perimeters_first
|| (this->layer_id == 0 && this->print_config->brim_width.value > 0))
entities.reverse();
// append perimeters for this slice as a collection
if (!entities.empty())
this->loops->append(entities);
}
// fill gaps
if (!gaps.empty()) {
/*
if (false) {
require "Slic3r/SVG.pm";
Slic3r::SVG::output(
"gaps.svg",
expolygons => union_ex(\@gaps),
);
}
*/
// where $pwidth < thickness < 2*$pspacing, infill with width = 2*$pwidth
// where 0.1*$pwidth < thickness < $pwidth, infill with width = 1*$pwidth
std::vector<PerimeterGeneratorGapSize> gap_sizes;
gap_sizes.push_back(PerimeterGeneratorGapSize(pwidth, 2*pspacing, 2*pwidth));
gap_sizes.push_back(PerimeterGeneratorGapSize(0.1*pwidth, pwidth, 1*pwidth));
for (std::vector<PerimeterGeneratorGapSize>::const_iterator gap_size = gap_sizes.begin();
gap_size != gap_sizes.end(); ++gap_size) {
ExtrusionEntityCollection gap_fill = this->_fill_gaps(gap_size->min,
gap_size->max, unscale(gap_size->width), gaps);
this->gap_fill->append(gap_fill.entities);
// Make sure we don't infill narrow parts that are already gap-filled
// (we only consider this surface's gaps to reduce the diff() complexity).
// Growing actual extrusions ensures that gaps not filled by medial axis
// are not subtracted from fill surfaces (they might be too short gaps
// that medial axis skips but infill might join with other infill regions
// and use zigzag).
coord_t dist = gap_size->width/2;
Polygons filled;
for (ExtrusionEntitiesPtr::const_iterator it = gap_fill.entities.begin();
it != gap_fill.entities.end(); ++it) {
Polygons f;
offset((*it)->as_polyline(), &f, dist);
filled.insert(filled.end(), f.begin(), f.end());
}
last = diff(last, filled);
gaps = diff(gaps, filled); // prevent more gap fill here
}
}
// create one more offset to be used as boundary for fill
// we offset by half the perimeter spacing (to get to the actual infill boundary)
// and then we offset back and forth by half the infill spacing to only consider the
// non-collapsing regions
coord_t inset = 0;
if (loop_number == 0) {
// one loop
inset += ext_pspacing2/2;
} else if (loop_number > 0) {
// two or more loops
inset += pspacing/2;
}
// only apply infill overlap if we actually have one perimeter
if (inset > 0)
inset -= this->config->get_abs_value("infill_overlap", inset + ispacing/2);
{
ExPolygons expp = union_ex(last);
// simplify infill contours according to resolution
Polygons pp;
for (ExPolygons::const_iterator ex = expp.begin(); ex != expp.end(); ++ex)
ex->simplify_p(SCALED_RESOLUTION, &pp);
// collapse too narrow infill areas
coord_t min_perimeter_infill_spacing = ispacing * (1 - INSET_OVERLAP_TOLERANCE);
expp = offset2_ex(
pp,
-inset -min_perimeter_infill_spacing/2,
+min_perimeter_infill_spacing/2
);
// append infill areas to fill_surfaces
for (ExPolygons::const_iterator ex = expp.begin(); ex != expp.end(); ++ex)
this->fill_surfaces->surfaces.push_back(Surface(stInternal, *ex)); // use a bogus surface type
}
}
}
void
SVG::draw(const ExPolygons &expolygons, std::string fill)
{
for (ExPolygons::const_iterator it = expolygons.begin(); it != expolygons.end(); ++it)
this->draw(*it, fill);
}
static inline iterator_type begin(const ExPolygons& polygon_set) {
return polygon_set.begin();
}
void
SVG::draw_outline(const ExPolygons &expolygons, std::string stroke_outer, std::string stroke_holes, coordf_t stroke_width)
{
for (ExPolygons::const_iterator it = expolygons.begin(); it != expolygons.end(); ++ it)
draw_outline(*it, stroke_outer, stroke_holes, stroke_width);
}
void
BridgeDetector::coverage(double angle, Polygons* coverage) const
{
// Clone our expolygon and rotate it so that we work with vertical lines.
ExPolygon expolygon = this->expolygon;
expolygon.rotate(PI/2.0 - angle, Point(0,0));
/* Outset the bridge expolygon by half the amount we used for detecting anchors;
we'll use this one to generate our trapezoids and be sure that their vertices
are inside the anchors and not on their contours leading to false negatives. */
ExPolygons grown;
offset(expolygon, &grown, this->extrusion_width/2.0);
// Compute trapezoids according to a vertical orientation
Polygons trapezoids;
for (ExPolygons::const_iterator it = grown.begin(); it != grown.end(); ++it)
it->get_trapezoids2(&trapezoids, PI/2.0);
// get anchors, convert them to Polygons and rotate them too
Polygons anchors;
for (ExPolygons::const_iterator anchor = this->_anchors.begin(); anchor != this->_anchors.end(); ++anchor) {
Polygons pp = *anchor;
for (Polygons::iterator p = pp.begin(); p != pp.end(); ++p)
p->rotate(PI/2.0 - angle, Point(0,0));
anchors.insert(anchors.end(), pp.begin(), pp.end());
}
Polygons covered;
for (Polygons::const_iterator trapezoid = trapezoids.begin(); trapezoid != trapezoids.end(); ++trapezoid) {
Lines lines = trapezoid->lines();
Lines supported;
intersection(lines, anchors, &supported);
// not nice, we need a more robust non-numeric check
for (size_t i = 0; i < supported.size(); ++i) {
if (supported[i].length() < this->extrusion_width) {
supported.erase(supported.begin() + i);
i--;
}
}
if (supported.size() >= 2) covered.push_back(*trapezoid);
}
// merge trapezoids and rotate them back
Polygons _coverage;
union_(covered, &_coverage);
for (Polygons::iterator p = _coverage.begin(); p != _coverage.end(); ++p)
p->rotate(-(PI/2.0 - angle), Point(0,0));
// intersect trapezoids with actual bridge area to remove extra margins
// and append it to result
intersection(_coverage, this->expolygon, coverage);
/*
if (0) {
my @lines = map @{$_->lines}, @$trapezoids;
$_->rotate(-(PI/2 - $angle), [0,0]) for @lines;
require "Slic3r/SVG.pm";
Slic3r::SVG::output(
"coverage_" . rad2deg($angle) . ".svg",
expolygons => [$self->expolygon],
green_expolygons => $self->_anchors,
red_expolygons => $coverage,
lines => \@lines,
);
}
*/
}
inline void expolygons_rotate(ExPolygons &expolys, double angle)
{
for (ExPolygons::iterator p = expolys.begin(); p != expolys.end(); ++p)
p->rotate(angle);
}
void
SVGExport::writeSVG(const std::string &outputfile)
{
// align to origin taking raft into account
BoundingBoxf3 bb = this->mesh.bounding_box();
if (this->config.raft_layers > 0) {
bb.min.x -= this->config.raft_offset.value;
bb.min.y -= this->config.raft_offset.value;
bb.max.x += this->config.raft_offset.value;
bb.max.y += this->config.raft_offset.value;
}
this->mesh.translate(-bb.min.x, -bb.min.y, -bb.min.z); // align to origin
bb.translate(-bb.min.x, -bb.min.y, -bb.min.z); // align to origin
const Sizef3 size = bb.size();
// if we are generating a raft, first_layer_height will not affect mesh slicing
const float lh = this->config.layer_height.value;
const float first_lh = this->config.first_layer_height.value;
// generate the list of Z coordinates for mesh slicing
// (we slice each layer at half of its thickness)
std::vector<float> slice_z, layer_z;
{
const float first_slice_lh = (this->config.raft_layers > 0) ? lh : first_lh;
slice_z.push_back(first_slice_lh/2);
layer_z.push_back(first_slice_lh);
}
while (layer_z.back() + lh/2 <= this->mesh.stl.stats.max.z) {
slice_z.push_back(layer_z.back() + lh/2);
layer_z.push_back(layer_z.back() + lh);
}
// perform the slicing
std::vector<ExPolygons> layers;
TriangleMeshSlicer(&this->mesh).slice(slice_z, &layers);
// generate a solid raft if requested
if (this->config.raft_layers > 0) {
ExPolygons raft = offset_ex(layers.front(), scale_(this->config.raft_offset));
for (int i = this->config.raft_layers; i >= 1; --i) {
layer_z.insert(layer_z.begin(), first_lh + lh * (i-1));
layers.insert(layers.begin(), raft);
}
// prepend total raft height to all sliced layers
for (int i = this->config.raft_layers; i < layer_z.size(); ++i)
layer_z[i] += first_lh + lh * (this->config.raft_layers-1);
}
// generate support material
std::vector<Points> support_material(layers.size());
if (this->config.support_material) {
// generate a grid of points according to the configured spacing,
// covering the entire object bounding box
Points support_material_points;
for (coordf_t x = bb.min.x; x <= bb.max.x; x += this->config.support_material_spacing) {
for (coordf_t y = bb.min.y; y <= bb.max.y; y += this->config.support_material_spacing) {
support_material_points.push_back(Point(scale_(x), scale_(y)));
}
}
// check overhangs, starting from the upper layer, and detect which points apply
// to each layer
ExPolygons overhangs;
for (int i = layer_z.size()-1; i >= 0; --i) {
overhangs = diff_ex(union_(overhangs, layers[i+1]), layers[i]);
for (Points::const_iterator it = support_material_points.begin(); it != support_material_points.end(); ++it) {
for (ExPolygons::const_iterator e = overhangs.begin(); e != overhangs.end(); ++e) {
if (e->contains(*it)) {
support_material[i].push_back(*it);
break;
}
}
}
}
}
double support_material_radius = this->config.support_material_extrusion_width.get_abs_value(this->config.layer_height)/2;
FILE* f = fopen(outputfile.c_str(), "w");
fprintf(f,
"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"
"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
"<svg width=\"%f\" height=\"%f\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:svg=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:slic3r=\"http://slic3r.org/namespaces/slic3r\" viewport-fill=\"black\">\n"
"<!-- Generated using Slic3r %s http://slic3r.org/ -->\n"
, size.x, size.y, SLIC3R_VERSION);
for (size_t i = 0; i < layer_z.size(); ++i) {
fprintf(f, "\t<g id=\"layer%zu\" slic3r:z=\"%0.4f\">\n", i, layer_z[i]);
for (ExPolygons::const_iterator it = layers[i].begin(); it != layers[i].end(); ++it) {
std::string pd;
Polygons pp = *it;
for (Polygons::const_iterator mp = pp.begin(); mp != pp.end(); ++mp) {
std::ostringstream d;
d << "M ";
for (Points::const_iterator p = mp->points.begin(); p != mp->points.end(); ++p) {
d << unscale(p->x) << " ";
d << unscale(p->y) << " ";
}
d << "z";
pd += d.str() + " ";
}
fprintf(f,"\t\t<path d=\"%s\" style=\"fill: %s; stroke: %s; stroke-width: %s; fill-type: evenodd\" slic3r:area=\"%0.4f\" />\n",
pd.c_str(), "white", "black", "0", unscale(unscale(it->area()))
);
}
for (Points::const_iterator it = support_material[i].begin(); it != support_material[i].end(); ++it) {
fprintf(f,"\t\t<circle cx=\"%f\" cy=\"%f\" r=\"%f\" stroke-width=\"0\" fill=\"white\" slic3r:type=\"support\" />\n",
unscale(it->x), unscale(it->y), support_material_radius
);
}
fprintf(f,"\t</g>\n");
}
fprintf(f,"</svg>\n");
}
void
SLAPrint::slice()
{
TriangleMesh mesh = this->model->mesh();
mesh.repair();
// align to origin taking raft into account
this->bb = mesh.bounding_box();
if (this->config.raft_layers > 0) {
this->bb.min.x -= this->config.raft_offset.value;
this->bb.min.y -= this->config.raft_offset.value;
this->bb.max.x += this->config.raft_offset.value;
this->bb.max.y += this->config.raft_offset.value;
}
mesh.translate(0, 0, -bb.min.z);
this->bb.translate(0, 0, -bb.min.z);
// if we are generating a raft, first_layer_height will not affect mesh slicing
const float lh = this->config.layer_height.value;
const float first_lh = this->config.first_layer_height.value;
// generate the list of Z coordinates for mesh slicing
// (we slice each layer at half of its thickness)
this->layers.clear();
{
const float first_slice_lh = (this->config.raft_layers > 0) ? lh : first_lh;
this->layers.push_back(Layer(first_slice_lh/2, first_slice_lh));
}
while (this->layers.back().print_z + lh/2 <= mesh.stl.stats.max.z) {
this->layers.push_back(Layer(this->layers.back().print_z + lh/2, this->layers.back().print_z + lh));
}
// perform slicing and generate layers
{
std::vector<float> slice_z;
for (size_t i = 0; i < this->layers.size(); ++i)
slice_z.push_back(this->layers[i].slice_z);
std::vector<ExPolygons> slices;
TriangleMeshSlicer(&mesh).slice(slice_z, &slices);
for (size_t i = 0; i < slices.size(); ++i)
this->layers[i].slices.expolygons = slices[i];
}
// generate infill
if (this->config.fill_density < 100) {
std::auto_ptr<Fill> fill(Fill::new_from_type(this->config.fill_pattern.value));
fill->bounding_box.merge(Point::new_scale(bb.min.x, bb.min.y));
fill->bounding_box.merge(Point::new_scale(bb.max.x, bb.max.y));
fill->spacing = this->config.get_abs_value("infill_extrusion_width", this->config.layer_height.value);
fill->angle = Geometry::deg2rad(this->config.fill_angle.value);
fill->density = this->config.fill_density.value/100;
parallelize<size_t>(
0,
this->layers.size()-1,
boost::bind(&SLAPrint::_infill_layer, this, _1, fill.get()),
this->config.threads.value
);
}
// generate support material
this->sm_pillars.clear();
ExPolygons overhangs;
if (this->config.support_material) {
// flatten and merge all the overhangs
{
Polygons pp;
for (std::vector<Layer>::const_iterator it = this->layers.begin()+1; it != this->layers.end(); ++it)
pp += diff(it->slices, (it - 1)->slices);
overhangs = union_ex(pp);
}
// generate points following the shape of each island
Points pillars_pos;
const coordf_t spacing = scale_(this->config.support_material_spacing);
const coordf_t radius = scale_(this->sm_pillars_radius());
for (ExPolygons::const_iterator it = overhangs.begin(); it != overhangs.end(); ++it) {
// leave a radius/2 gap between pillars and contour to prevent lateral adhesion
for (float inset = radius * 1.5;; inset += spacing) {
// inset according to the configured spacing
Polygons curr = offset(*it, -inset);
if (curr.empty()) break;
// generate points along the contours
for (Polygons::const_iterator pg = curr.begin(); pg != curr.end(); ++pg) {
Points pp = pg->equally_spaced_points(spacing);
for (Points::const_iterator p = pp.begin(); p != pp.end(); ++p)
pillars_pos.push_back(*p);
}
}
}
// for each pillar, check which layers it applies to
for (Points::const_iterator p = pillars_pos.begin(); p != pillars_pos.end(); ++p) {
SupportPillar pillar(*p);
bool object_hit = false;
// check layers top-down
for (int i = this->layers.size()-1; i >= 0; --i) {
// check whether point is void in this layer
if (!this->layers[i].slices.contains(*p)) {
// no slice contains the point, so it's in the void
if (pillar.top_layer > 0) {
// we have a pillar, so extend it
pillar.bottom_layer = i + this->config.raft_layers;
} else if (object_hit) {
// we don't have a pillar and we're below the object, so create one
pillar.top_layer = i + this->config.raft_layers;
}
} else {
if (pillar.top_layer > 0) {
// we have a pillar which is not needed anymore, so store it and initialize a new potential pillar
this->sm_pillars.push_back(pillar);
pillar = SupportPillar(*p);
}
object_hit = true;
}
}
if (pillar.top_layer > 0) this->sm_pillars.push_back(pillar);
}
}
// generate a solid raft if requested
// (do this after support material because we take support material shape into account)
if (this->config.raft_layers > 0) {
ExPolygons raft = this->layers.front().slices + overhangs; // take support material into account
raft = offset_ex(raft, scale_(this->config.raft_offset));
for (int i = this->config.raft_layers; i >= 1; --i) {
this->layers.insert(this->layers.begin(), Layer(0, first_lh + lh * (i-1)));
this->layers.front().slices = raft;
}
// prepend total raft height to all sliced layers
for (size_t i = this->config.raft_layers; i < this->layers.size(); ++i)
this->layers[i].print_z += first_lh + lh * (this->config.raft_layers-1);
}
}
void
LayerRegion::process_external_surfaces(const Layer* lower_layer)
{
const Surfaces &surfaces = this->fill_surfaces.surfaces;
const double margin = scale_(EXTERNAL_INFILL_MARGIN);
SurfaceCollection bottom;
for (Surfaces::const_iterator surface = surfaces.begin(); surface != surfaces.end(); ++surface) {
if (!surface->is_bottom()) continue;
ExPolygons grown = offset_ex(surface->expolygon, +margin);
/* detect bridge direction before merging grown surfaces otherwise adjacent bridges
would get merged into a single one while they need different directions
also, supply the original expolygon instead of the grown one, because in case
of very thin (but still working) anchors, the grown expolygon would go beyond them */
double angle = -1;
if (lower_layer != NULL) {
BridgeDetector bd(
surface->expolygon,
lower_layer->slices,
this->flow(frInfill, this->layer()->height, true).scaled_width()
);
#ifdef SLIC3R_DEBUG
printf("Processing bridge at layer %zu:\n", this->layer()->id());
#endif
if (bd.detect_angle()) {
angle = bd.angle;
if (this->layer()->object()->config.support_material) {
Polygons coverage = bd.coverage();
this->bridged.insert(this->bridged.end(), coverage.begin(), coverage.end());
this->unsupported_bridge_edges.append(bd.unsupported_edges());
}
}
}
for (ExPolygons::const_iterator it = grown.begin(); it != grown.end(); ++it) {
Surface s = *surface;
s.expolygon = *it;
s.bridge_angle = angle;
bottom.surfaces.push_back(s);
}
}
SurfaceCollection top;
for (Surfaces::const_iterator surface = surfaces.begin(); surface != surfaces.end(); ++surface) {
if (surface->surface_type != stTop) continue;
// give priority to bottom surfaces
ExPolygons grown = diff_ex(
offset(surface->expolygon, +margin),
(Polygons)bottom
);
for (ExPolygons::const_iterator it = grown.begin(); it != grown.end(); ++it) {
Surface s = *surface;
s.expolygon = *it;
top.surfaces.push_back(s);
}
}
/* if we're slicing with no infill, we can't extend external surfaces
over non-existent infill */
SurfaceCollection fill_boundaries;
if (this->region()->config.fill_density.value > 0) {
fill_boundaries = SurfaceCollection(surfaces);
} else {
for (Surfaces::const_iterator it = surfaces.begin(); it != surfaces.end(); ++it) {
if (it->surface_type != stInternal)
fill_boundaries.surfaces.push_back(*it);
}
}
// intersect the grown surfaces with the actual fill boundaries
SurfaceCollection new_surfaces;
{
// merge top and bottom in a single collection
SurfaceCollection tb = top;
tb.append(bottom);
// group surfaces
std::vector<SurfacesConstPtr> groups;
tb.group(&groups);
for (std::vector<SurfacesConstPtr>::const_iterator g = groups.begin(); g != groups.end(); ++g) {
Polygons subject;
for (SurfacesConstPtr::const_iterator s = g->begin(); s != g->end(); ++s)
append_to(subject, (Polygons)**s);
ExPolygons expp = intersection_ex(
subject,
(Polygons)fill_boundaries,
true // to ensure adjacent expolygons are unified
);
for (ExPolygons::const_iterator ex = expp.begin(); ex != expp.end(); ++ex) {
Surface s = *g->front();
s.expolygon = *ex;
new_surfaces.surfaces.push_back(s);
}
}
}
/* subtract the new top surfaces from the other non-top surfaces and re-add them */
{
SurfaceCollection other;
for (Surfaces::const_iterator s = surfaces.begin(); s != surfaces.end(); ++s) {
if (s->surface_type != stTop && !s->is_bottom())
other.surfaces.push_back(*s);
}
// group surfaces
std::vector<SurfacesConstPtr> groups;
other.group(&groups);
for (std::vector<SurfacesConstPtr>::const_iterator g = groups.begin(); g != groups.end(); ++g) {
Polygons subject;
for (SurfacesConstPtr::const_iterator s = g->begin(); s != g->end(); ++s)
append_to(subject, (Polygons)**s);
ExPolygons expp = diff_ex(
subject,
(Polygons)new_surfaces
);
for (ExPolygons::const_iterator ex = expp.begin(); ex != expp.end(); ++ex) {
Surface s = *g->front();
s.expolygon = *ex;
new_surfaces.surfaces.push_back(s);
}
}
}
this->fill_surfaces = new_surfaces;
}
void
SLAPrint::write_svg(const std::string &outputfile) const
{
const Sizef3 size = this->bb.size();
const double support_material_radius = sm_pillars_radius();
FILE* f = fopen(outputfile.c_str(), "w");
fprintf(f,
"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"
"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
"<svg width=\"%f\" height=\"%f\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:svg=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:slic3r=\"http://slic3r.org/namespaces/slic3r\" viewport-fill=\"black\">\n"
"<!-- Generated using Slic3r %s http://slic3r.org/ -->\n"
, size.x, size.y, SLIC3R_VERSION);
for (size_t i = 0; i < this->layers.size(); ++i) {
const Layer &layer = this->layers[i];
fprintf(f,
"\t<g id=\"layer%zu\" slic3r:z=\"%0.4f\" slic3r:slice-z=\"%0.4f\" slic3r:layer-height=\"%0.4f\">\n",
i,
layer.print_z,
layer.slice_z,
layer.print_z - ((i == 0) ? 0. : this->layers[i-1].print_z)
);
if (layer.solid) {
const ExPolygons &slices = layer.slices.expolygons;
for (ExPolygons::const_iterator it = slices.begin(); it != slices.end(); ++it) {
std::string pd = this->_SVG_path_d(*it);
fprintf(f,"\t\t<path d=\"%s\" style=\"fill: %s; stroke: %s; stroke-width: %s; fill-type: evenodd\" slic3r:area=\"%0.4f\" />\n",
pd.c_str(), "white", "black", "0", unscale(unscale(it->area()))
);
}
} else {
// Perimeters.
for (ExPolygons::const_iterator it = layer.perimeters.expolygons.begin();
it != layer.perimeters.expolygons.end(); ++it) {
std::string pd = this->_SVG_path_d(*it);
fprintf(f,"\t\t<path d=\"%s\" style=\"fill: %s; stroke: %s; stroke-width: %s; fill-type: evenodd\" slic3r:type=\"perimeter\" />\n",
pd.c_str(), "white", "black", "0"
);
}
// Solid infill.
for (ExPolygons::const_iterator it = layer.solid_infill.expolygons.begin();
it != layer.solid_infill.expolygons.end(); ++it) {
std::string pd = this->_SVG_path_d(*it);
fprintf(f,"\t\t<path d=\"%s\" style=\"fill: %s; stroke: %s; stroke-width: %s; fill-type: evenodd\" slic3r:type=\"infill\" />\n",
pd.c_str(), "white", "black", "0"
);
}
// Internal infill.
for (ExtrusionEntitiesPtr::const_iterator it = layer.infill.entities.begin();
it != layer.infill.entities.end(); ++it) {
const ExPolygons infill = union_ex((*it)->grow());
for (ExPolygons::const_iterator e = infill.begin(); e != infill.end(); ++e) {
std::string pd = this->_SVG_path_d(*e);
fprintf(f,"\t\t<path d=\"%s\" style=\"fill: %s; stroke: %s; stroke-width: %s; fill-type: evenodd\" slic3r:type=\"infill\" />\n",
pd.c_str(), "white", "black", "0"
);
}
}
}
// don't print support material in raft layers
if (i >= (size_t)this->config.raft_layers) {
// look for support material pillars belonging to this layer
for (std::vector<SupportPillar>::const_iterator it = this->sm_pillars.begin(); it != this->sm_pillars.end(); ++it) {
if (!(it->top_layer >= i && it->bottom_layer <= i)) continue;
// generate a conic tip
float radius = fminf(
support_material_radius,
(it->top_layer - i + 1) * this->config.layer_height.value
);
fprintf(f,"\t\t<circle cx=\"%f\" cy=\"%f\" r=\"%f\" stroke-width=\"0\" fill=\"white\" slic3r:type=\"support\" />\n",
unscale(it->x) - this->bb.min.x,
size.y - (unscale(it->y) - this->bb.min.y),
radius
);
}
}
fprintf(f,"\t</g>\n");
}
fprintf(f,"</svg>\n");
}