Merge branch 'master' of https://github.com/prusa3d/Slic3r

sandboxes/slabasebed/slabasebed.cpp

@@ -1,10 +1,10 @@
 #include <iostream>
 #include <string>
 
-#include <libslic3r.h>
-#include "TriangleMesh.hpp"
-#include "SLABasePool.hpp"
-#include "benchmark.h"
+#include <libslic3r/libslic3r.h>
+#include <libslic3r/TriangleMesh.hpp>
+#include <libslic3r/SLA/SLABasePool.hpp>
+#include <libnest2d/tools/benchmark.h>
 
 const std::string USAGE_STR = {
     "Usage: slabasebed stlfilename.stl"
@@ -28,7 +28,7 @@ int main(const int argc, const char *argv[]) {
     ExPolygons ground_slice;
     TriangleMesh basepool;
 
-    sla::ground_layer(model, ground_slice, 0.1f);
+    sla::base_plate(model, ground_slice, 0.1f);
 
     bench.start();
     sla::create_base_pool(ground_slice, basepool);

src/libslic3r/EdgeGrid.cpp

@@ -9,7 +9,9 @@
 #endif /* SLIC3R_GUI */
 
 #include "libslic3r.h"
+#include "ClipperUtils.hpp"
 #include "EdgeGrid.hpp"
+#include "SVG.hpp"
 
 #if 0
 // Enable debugging and assert in this file.
@@ -756,8 +758,8 @@ void EdgeGrid::Grid::calculate_sdf()
 	float search_radius = float(m_resolution<<1);
 	m_signed_distance_field.assign(nrows * ncols, search_radius);
 	// For each cell:
-	for (size_t r = 0; r < m_rows; ++ r) {
-		for (size_t c = 0; c < m_cols; ++ c) {
+	for (int r = 0; r < (int)m_rows; ++ r) {
+		for (int c = 0; c < (int)m_cols; ++ c) {
 			const Cell &cell = m_cells[r * m_cols + c];
 			// For each segment in the cell:
 			for (size_t i = cell.begin; i != cell.end; ++ i) {
@@ -842,6 +844,8 @@ void EdgeGrid::Grid::calculate_sdf()
 #if 0
 	static int iRun = 0;
 	++ iRun;
+    if (wxImage::FindHandler(wxBITMAP_TYPE_PNG) == nullptr)
+        wxImage::AddHandler(new wxPNGHandler);
 //#ifdef SLIC3R_GUI
 	{ 
 		wxImage img(ncols, nrows);
@@ -1356,9 +1360,101 @@ Polygons EdgeGrid::Grid::contours_simplified(coord_t offset, bool fill_holes) co
 	return out;
 }
 
+inline int segments_could_intersect(
+	const Slic3r::Point &ip1, const Slic3r::Point &ip2, 
+	const Slic3r::Point &jp1, const Slic3r::Point &jp2)
+{
+	Vec2i64 iv   = (ip2 - ip1).cast<int64_t>();
+	Vec2i64 vij1 = (jp1 - ip1).cast<int64_t>();
+	Vec2i64 vij2 = (jp2 - ip1).cast<int64_t>();
+	int64_t tij1 = cross2(iv, vij1);
+	int64_t tij2 = cross2(iv, vij2);
+	int     sij1 = (tij1 > 0) ? 1 : ((tij1 < 0) ? -1 : 0); // signum
+	int     sij2 = (tij2 > 0) ? 1 : ((tij2 < 0) ? -1 : 0);
+	return sij1 * sij2;
+}
+
+inline bool segments_intersect(
+	const Slic3r::Point &ip1, const Slic3r::Point &ip2, 
+	const Slic3r::Point &jp1, const Slic3r::Point &jp2)
+{
+	return segments_could_intersect(ip1, ip2, jp1, jp2) <= 0 && 
+		   segments_could_intersect(jp1, jp2, ip1, ip2) <= 0;
+}
+
+std::vector<std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge>> EdgeGrid::Grid::intersecting_edges() const
+{
+	std::vector<std::pair<ContourEdge, ContourEdge>> out;
+	// For each cell:
+	for (int r = 0; r < (int)m_rows; ++ r) {
+		for (int c = 0; c < (int)m_cols; ++ c) {
+			const Cell &cell = m_cells[r * m_cols + c];
+			// For each pair of segments in the cell:
+			for (size_t i = cell.begin; i != cell.end; ++ i) {
+				const Slic3r::Points &ipts = *m_contours[m_cell_data[i].first];
+				size_t ipt = m_cell_data[i].second;
+				// End points of the line segment and their vector.
+				const Slic3r::Point &ip1 = ipts[ipt];
+				const Slic3r::Point &ip2 = ipts[(ipt + 1 == ipts.size()) ? 0 : ipt + 1];
+				for (size_t j = i + 1; j != cell.end; ++ j) {
+					const Slic3r::Points &jpts = *m_contours[m_cell_data[j].first];
+					size_t 				  jpt  = m_cell_data[j].second;
+					// End points of the line segment and their vector.
+					const Slic3r::Point  &jp1  = jpts[jpt];
+					const Slic3r::Point  &jp2  = jpts[(jpt + 1 == jpts.size()) ? 0 : jpt + 1];
+					if (&ipts == &jpts && (&ip1 == &jp2 || &jp1 == &ip2))
+						// Segments of the same contour share a common vertex.
+						continue;
+					if (segments_intersect(ip1, ip2, jp1, jp2)) {
+						// The two segments intersect. Add them to the output.
+						int jfirst = (&jpts < &ipts) || (&jpts == &ipts && jpt < ipt);
+						out.emplace_back(jfirst ? 
+							std::make_pair(std::make_pair(&ipts, ipt), std::make_pair(&jpts, jpt)) : 
+							std::make_pair(std::make_pair(&ipts, ipt), std::make_pair(&jpts, jpt)));
+					}
+				}
+			}
+		}
+	}
+	Slic3r::sort_remove_duplicates(out);
+	return out;
+}
+
+bool EdgeGrid::Grid::has_intersecting_edges() const
+{
+	// For each cell:
+	for (int r = 0; r < (int)m_rows; ++ r) {
+		for (int c = 0; c < (int)m_cols; ++ c) {
+			const Cell &cell = m_cells[r * m_cols + c];
+			// For each pair of segments in the cell:
+			for (size_t i = cell.begin; i != cell.end; ++ i) {
+				const Slic3r::Points &ipts = *m_contours[m_cell_data[i].first];
+				size_t ipt = m_cell_data[i].second;
+				// End points of the line segment and their vector.
+				const Slic3r::Point &ip1 = ipts[ipt];
+				const Slic3r::Point &ip2 = ipts[(ipt + 1 == ipts.size()) ? 0 : ipt + 1];
+				for (size_t j = i + 1; j != cell.end; ++ j) {
+					const Slic3r::Points &jpts = *m_contours[m_cell_data[j].first];
+					size_t 				  jpt  = m_cell_data[j].second;
+					// End points of the line segment and their vector.
+					const Slic3r::Point  &jp1  = jpts[jpt];
+					const Slic3r::Point  &jp2  = jpts[(jpt + 1 == jpts.size()) ? 0 : jpt + 1];
+					if (! (&ipts == &jpts && (&ip1 == &jp2 || &jp1 == &ip2)) && 
+						segments_intersect(ip1, ip2, jp1, jp2))
+						return true;
+				}
+			}
+		}
+	}
+	return false;
+}
+
 #if 0
 void EdgeGrid::save_png(const EdgeGrid::Grid &grid, const BoundingBox &bbox, coord_t resolution, const char *path)
 {
+    if (wxImage::FindHandler(wxBITMAP_TYPE_PNG) == nullptr)
+        wxImage::AddHandler(new wxPNGHandler);
+
 	unsigned int w = (bbox.max(0) - bbox.min(0) + resolution - 1) / resolution;
 	unsigned int h = (bbox.max(1) - bbox.min(1) + resolution - 1) / resolution;
 	wxImage img(w, h);
@@ -1450,4 +1546,59 @@ void EdgeGrid::save_png(const EdgeGrid::Grid &grid, const BoundingBox &bbox, coo
 }
 #endif /* SLIC3R_GUI */
 
+// Find all pairs of intersectiong edges from the set of polygons.
+std::vector<std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge>> intersecting_edges(const Polygons &polygons)
+{
+	double len = 0;
+	size_t cnt = 0;
+	BoundingBox bbox;
+	for (const Polygon &poly : polygons) {
+		if (poly.points.size() < 2)
+			continue;
+		for (size_t i = 0; i < poly.points.size(); ++ i) {
+			bbox.merge(poly.points[i]);
+			size_t j = (i == 0) ? (poly.points.size() - 1) : i - 1;
+			len += (poly.points[j] - poly.points[i]).cast<double>().norm();
+			++ cnt;
+		}
+	}
+	len /= double(cnt);
+	bbox.offset(20);
+	EdgeGrid::Grid grid;
+	grid.set_bbox(bbox);
+	grid.create(polygons, len);
+	return grid.intersecting_edges();
+}
+
+// Find all pairs of intersectiong edges from the set of polygons, highlight them in an SVG.
+void export_intersections_to_svg(const std::string &filename, const Polygons &polygons)
+{
+	std::vector<std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge>> intersections = intersecting_edges(polygons);
+    BoundingBox bbox = get_extents(polygons);
+    SVG svg(filename.c_str(), bbox);
+    svg.draw(union_ex(polygons), "gray", 0.25f);
+    svg.draw_outline(polygons, "black");
+    std::set<const Points*> intersecting_contours;
+    for (const std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge> &ie : intersections) {
+    	intersecting_contours.insert(ie.first.first);
+    	intersecting_contours.insert(ie.second.first);
+    }
+    // Highlight the contours with intersections.
+    coord_t line_width = coord_t(scale_(0.01));
+    for (const Points *ic : intersecting_contours) {
+	    svg.draw_outline(Polygon(*ic), "green");
+	    svg.draw_outline(Polygon(*ic), "black", line_width);
+    }
+	// Paint the intersections.
+    for (const std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge> &intersecting_edges : intersections) {
+    	auto edge = [](const EdgeGrid::Grid::ContourEdge &e) {
+    		return Line(e.first->at(e.second),
+    					e.first->at((e.second + 1 == e.first->size()) ? 0 : e.second + 1));
+    	};
+        svg.draw(edge(intersecting_edges.first), "red", line_width);
+        svg.draw(edge(intersecting_edges.second), "red", line_width);
+    }
+    svg.Close();
+}
+
 } // namespace Slic3r

src/libslic3r/Fill/FillGyroid.cpp

@@ -133,7 +133,7 @@ void FillGyroid::_fill_surface_single(
     // no rotation is supported for this infill pattern (yet)
     BoundingBox bb = expolygon.contour.bounding_box();
     // Density adjusted to have a good %of weight.
-    double      density_adjusted = std::max(0., params.density * 2.);
+    double      density_adjusted = std::max(0., params.density * 2.44);
     // Distance between the gyroid waves in scaled coordinates.
     coord_t     distance = coord_t(scale_(this->spacing) / density_adjusted);
 

src/libslic3r/GCode/WipeTowerPrusaMM.cpp

@@ -545,7 +545,8 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::prime(
 	m_print_brim = true;
 
     // Ask our writer about how much material was consumed:
-    m_used_filament_length[m_current_tool] += writer.get_and_reset_used_filament_length();
+    if (m_current_tool < m_used_filament_length.size())
+    	m_used_filament_length[m_current_tool] += writer.get_and_reset_used_filament_length();
 
 	ToolChangeResult result;
     result.priming      = true;
@@ -698,7 +699,8 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::toolchange_Brim(bool sideOnly, flo
     m_print_brim = false;  // Mark the brim as extruded
 
     // Ask our writer about how much material was consumed:
-    m_used_filament_length[m_current_tool] += writer.get_and_reset_used_filament_length();
+    if (m_current_tool < m_used_filament_length.size())
+    	m_used_filament_length[m_current_tool] += writer.get_and_reset_used_filament_length();
 
 	ToolChangeResult result;
     result.priming      = false;
@@ -868,7 +870,8 @@ void WipeTowerPrusaMM::toolchange_Change(
 	material_type 		new_material)
 {
     // Ask the writer about how much of the old filament we consumed:
-    m_used_filament_length[m_current_tool] += writer.get_and_reset_used_filament_length();
+    if (m_current_tool < m_used_filament_length.size())
+    	m_used_filament_length[m_current_tool] += writer.get_and_reset_used_filament_length();
 
 	// Speed override for the material. Go slow for flex and soluble materials.
 	int speed_override;

src/libslic3r/Model.cpp

@@ -521,10 +521,14 @@ void Model::adjust_min_z()
 unsigned int Model::get_auto_extruder_id(unsigned int max_extruders)
 {
     unsigned int id = s_auto_extruder_id;
-
-    if (++s_auto_extruder_id > max_extruders)
+    if (id > max_extruders) {
+        // The current counter is invalid, likely due to switching the printer profiles
+        // to a profile with a lower number of extruders.
         reset_auto_extruder_id();
-
+        id = s_auto_extruder_id;
+    } else if (++ s_auto_extruder_id > max_extruders) {
+        reset_auto_extruder_id();
+    }
     return id;
 }
 

src/libslic3r/MultiPoint.hpp

@@ -107,6 +107,23 @@ extern BoundingBox get_extents(const MultiPoint &mp);
 extern BoundingBox get_extents_rotated(const std::vector<Point> &points, double angle);
 extern BoundingBox get_extents_rotated(const MultiPoint &mp, double angle);
 
+inline double length(const Points &pts) {
+    double total = 0;
+    if (! pts.empty()) {
+        auto it = pts.begin();
+        for (auto it_prev = it ++; it != pts.end(); ++ it, ++ it_prev)
+            total += (*it - *it_prev).cast<double>().norm();
+    }
+    return total;
+}
+
+inline double area(const Points &polygon) {
+    double area = 0.;
+    for (size_t i = 0, j = polygon.size() - 1; i < polygon.size(); j = i ++)
+		area += double(polygon[i](0) + polygon[j](0)) * double(polygon[i](1) - polygon[j](1));
+    return area;
+}
+
 } // namespace Slic3r
 
 #endif

src/libslic3r/Point.hpp

@@ -187,6 +187,24 @@ public:
             m_map.emplace(std::make_pair(Vec2crd(pt->x()>>m_grid_log2, pt->y()>>m_grid_log2), std::move(value)));
     }
 
+    // Erase a data point equal to value. (ValueType has to declare the operator==).
+    // Returns true if the data point equal to value was found and removed.
+    bool erase(const ValueType &value) {
+        const Point *pt = m_point_accessor(value);
+        if (pt != nullptr) {
+            // Range of fragment starts around grid_corner, close to pt.
+            auto range = m_map.equal_range(Point((*pt)(0)>>m_grid_log2, (*pt)(1)>>m_grid_log2));
+            // Remove the first item.
+            for (auto it = range.first; it != range.second; ++ it) {
+                if (it->second == value) {
+                    m_map.erase(it);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
     // Return a pair of <ValueType*, distance_squared>
     std::pair<const ValueType*, double> find(const Vec2crd &pt) {
         // Iterate over 4 closest grid cells around pt,
@@ -214,7 +232,7 @@ public:
                 }
             }
         }
-        return (value_min != nullptr && dist_min < coordf_t(m_search_radius * m_search_radius)) ? 
+        return (value_min != nullptr && dist_min < coordf_t(m_search_radius) * coordf_t(m_search_radius)) ? 
             std::make_pair(value_min, dist_min) : 
             std::make_pair(nullptr, std::numeric_limits<double>::max());
     }

src/libslic3r/Polyline.hpp

@@ -81,8 +81,8 @@ extern BoundingBox get_extents(const Polylines &polylines);
 
 inline double total_length(const Polylines &polylines) {
     double total = 0;
-    for (Polylines::const_iterator it = polylines.begin(); it != polylines.end(); ++it)
-        total += it->length();
+    for (const Polyline &pl : polylines)
+        total += pl.length();
     return total;
 }
 

src/libslic3r/Print.cpp

@@ -281,16 +281,17 @@ bool Print::is_step_done(PrintObjectStep step) const
 std::vector<unsigned int> Print::object_extruders() const
 {
     std::vector<unsigned int> extruders;
+    extruders.reserve(m_regions.size() * 3);
     
-    for (PrintRegion* region : m_regions) {
+    for (const PrintRegion *region : m_regions) {
         // these checks reflect the same logic used in the GUI for enabling/disabling
         // extruder selection fields
         if (region->config().perimeters.value > 0 || m_config.brim_width.value > 0)
-            extruders.push_back(region->config().perimeter_extruder - 1);
+            extruders.emplace_back(region->config().perimeter_extruder - 1);
         if (region->config().fill_density.value > 0)
-            extruders.push_back(region->config().infill_extruder - 1);
+            extruders.emplace_back(region->config().infill_extruder - 1);
         if (region->config().top_solid_layers.value > 0 || region->config().bottom_solid_layers.value > 0)
-            extruders.push_back(region->config().solid_infill_extruder - 1);
+            extruders.emplace_back(region->config().solid_infill_extruder - 1);
     }
     
     sort_remove_duplicates(extruders);
@@ -480,14 +481,6 @@ bool Print::apply_config(DynamicPrintConfig config)
         PrintObjectConfig new_config = this->default_object_config();
         // we override the new config with object-specific options
         normalize_and_apply_config(new_config, object->model_object()->config);
-        // Force a refresh of a variable layer height profile at the PrintObject if it is not valid.
-        if (! object->layer_height_profile_valid) {
-            // The layer_height_profile is not valid for some reason (updated by the user or invalidated due to some option change).
-            // Invalidate the slicing step, which in turn invalidates everything.
-            object->invalidate_step(posSlice);
-            // Trigger recalculation.
-            invalidated = true;
-        }
         // check whether the new config is different from the current one
         t_config_option_keys diff = object->config().diff(new_config);
         object->config_apply_only(new_config, diff, true);
@@ -567,8 +560,7 @@ exit_for_rearrange_regions:
 
     // Always make sure that the layer_height_profiles are set, as they should not be modified from the worker threads.
     for (PrintObject *object : m_objects)
-        if (! object->layer_height_profile_valid)
-            object->update_layer_height_profile();
+        object->update_layer_height_profile();
     
     return invalidated;
 }
@@ -1141,6 +1133,8 @@ Print::ApplyStatus Print::apply(const Model &model, const DynamicPrintConfig &co
     // Always make sure that the layer_height_profiles are set, as they should not be modified from the worker threads.
     for (PrintObject *object : m_objects)
         if (! object->layer_height_profile_valid)
+            // No need to call the next line as the step should already be invalidated above.
+            // update_apply_status(object->invalidate_step(posSlice));
             object->update_layer_height_profile();
 
     //FIXME there may be a race condition with the G-code export running at the background thread.
@@ -1165,6 +1159,7 @@ bool Print::has_skirt() const
         || this->has_infinite_skirt();
 }
 
+// Precondition: Print::validate() requires the Print::apply() to be called its invocation.
 std::string Print::validate() const
 {
     if (m_objects.empty())
@@ -1253,12 +1248,10 @@ std::string Print::validate() const
                 return L("The Wipe Tower is only supported for multiple objects if they are printed with the same support_material_contact_distance");
             if (! equal_layering(slicing_params, slicing_params0))
                 return L("The Wipe Tower is only supported for multiple objects if they are sliced equally.");
-            bool was_layer_height_profile_valid = object->layer_height_profile_valid;
-            object->update_layer_height_profile();
-            object->layer_height_profile_valid = was_layer_height_profile_valid;
 
             if ( m_config.variable_layer_height ) { // comparing layer height profiles
                 bool failed = false;
+                // layer_height_profile should be set by Print::apply().
                 if (tallest_object->layer_height_profile.size() >= object->layer_height_profile.size() ) {
                     int i = 0;
                     while ( i < object->layer_height_profile.size() && i < tallest_object->layer_height_profile.size()) {

src/libslic3r/Print.hpp

@@ -78,7 +78,6 @@ private: // Prevents erroneous use by other classes.
 public:
     // vector of (vectors of volume ids), indexed by region_id
     std::vector<std::vector<int>> region_volumes;
-    t_layer_height_ranges   layer_height_ranges;
 
     // Profile of increasing z to a layer height, to be linearly interpolated when calculating the layers.
     // The pairs of <z, layer_height> are packed into a 1D array to simplify handling by the Perl XS.
@@ -298,7 +297,10 @@ public:
 
     // methods for handling state
     bool                is_step_done(PrintStep step) const { return Inherited::is_step_done(step); }
+    // Returns true if an object step is done on all objects and there's at least one object.    
     bool                is_step_done(PrintObjectStep step) const;
+    // Returns true if the last step was finished with success.
+    bool                finished() const override { return this->is_step_done(psGCodeExport); }
 
     bool                has_infinite_skirt() const;
     bool                has_skirt() const;

src/libslic3r/PrintBase.hpp

@@ -285,6 +285,8 @@ public:
 	void                       cancel_internal() { m_cancel_status = CANCELED_INTERNAL; }
     // Cancel the running computation. Stop execution of all the background threads.
 	void                       restart() { m_cancel_status = NOT_CANCELED; }
+    // Returns true if the last step was finished with success.
+    virtual bool               finished() const = 0;
 
     const PlaceholderParser&   placeholder_parser() const { return m_placeholder_parser; }
     PlaceholderParser&         placeholder_parser() { return m_placeholder_parser; }

src/libslic3r/PrintObject.cpp

@@ -65,7 +65,6 @@ PrintObject::PrintObject(Print* print, ModelObject* model_object, bool add_insta
         this->set_copies(copies);
     }
 
-    this->layer_height_ranges = model_object->layer_height_ranges;
     this->layer_height_profile = model_object->layer_height_profile;
 }
 
@@ -1109,7 +1108,7 @@ void PrintObject::discover_vertical_shells()
 #if 1
                     // Intentionally inflate a bit more than how much the region has been shrunk, 
                     // so there will be some overlap between this solid infill and the other infill regions (mainly the sparse infill).
-                    shell = offset2(shell, - 0.5f * min_perimeter_infill_spacing, 0.8f * min_perimeter_infill_spacing, ClipperLib::jtSquare);
+                    shell = offset(offset_ex(union_ex(shell), - 0.5f * min_perimeter_infill_spacing), 0.8f * min_perimeter_infill_spacing, ClipperLib::jtSquare);
                     if (shell.empty())
                         continue;
 #else
@@ -1330,7 +1329,7 @@ bool PrintObject::update_layer_height_profile(std::vector<coordf_t> &layer_heigh
     bool updated = false;
 
     // If the layer height profile is not set, try to use the one stored at the ModelObject.
-    if (layer_height_profile.empty() && layer_height_profile.data() != this->model_object()->layer_height_profile.data()) {
+    if (layer_height_profile.empty()) {
         layer_height_profile = this->model_object()->layer_height_profile;
         updated = true;
     }
@@ -1347,10 +1346,9 @@ bool PrintObject::update_layer_height_profile(std::vector<coordf_t> &layer_heigh
     if (layer_height_profile.empty()) {
         if (0)
 //        if (this->layer_height_profile.empty())
-            layer_height_profile = layer_height_profile_adaptive(slicing_params, this->layer_height_ranges,
-                this->model_object()->volumes);
+			layer_height_profile = layer_height_profile_adaptive(slicing_params, this->model_object()->layer_height_ranges, this->model_object()->volumes);
         else
-            layer_height_profile = layer_height_profile_from_ranges(slicing_params, this->layer_height_ranges);
+			layer_height_profile = layer_height_profile_from_ranges(slicing_params, this->model_object()->layer_height_ranges);
         updated = true;
     }
     return updated;

src/libslic3r/Rasterizer/bicubic.h

@@ -0,0 +1,186 @@
+#ifndef BICUBIC_HPP
+#define BICUBIC_HPP
+
+#include <algorithm>
+#include <vector>
+#include <cmath>
+
+#include <Eigen/Dense>
+
+namespace Slic3r {
+
+namespace BicubicInternal {
+	// Linear kernel, to be able to test cubic methods with hat kernels.
+	template<typename T>
+	struct LinearKernel
+	{
+		typedef T	FloatType;
+
+		static T a00() { return T(0.); }
+		static T a01() { return T(0.); }
+		static T a02() { return T(0.); }
+		static T a03() { return T(0.); }
+		static T a10() { return T(1.); }
+		static T a11() { return T(-1.); }
+		static T a12() { return T(0.); }
+		static T a13() { return T(0.); }
+		static T a20() { return T(0.); }
+		static T a21() { return T(1.); }
+		static T a22() { return T(0.); }
+		static T a23() { return T(0.); }
+		static T a30() { return T(0.); }
+		static T a31() { return T(0.); }
+		static T a32() { return T(0.); }
+		static T a33() { return T(0.); }
+	};
+
+	// Interpolation kernel aka Catmul-Rom aka Keyes kernel.
+	template<typename T>
+	struct CubicCatmulRomKernel
+	{
+		typedef T	FloatType;
+
+		static T a00() { return     0;     }
+		static T a01() { return (T)-0.5;   }
+		static T a02() { return (T) 1.;    }
+		static T a03() { return (T)-0.5;   }
+		static T a10() { return (T) 1.;    }
+		static T a11() { return     0;     }
+		static T a12() { return (T)-5./2.; }
+		static T a13() { return (T) 3./2.; }
+		static T a20() { return     0;     }
+		static T a21() { return (T) 0.5;   }
+		static T a22() { return (T) 2.;    }
+		static T a23() { return (T)-3./2.; }
+		static T a30() { return     0;     }
+		static T a31() { return     0;     }
+		static T a32() { return (T)-0.5;   }
+		static T a33() { return (T) 0.5;   }
+	};
+
+	// B-spline kernel
+	template<typename T>
+	struct CubicBSplineKernel
+	{
+		typedef T	FloatType;
+
+		static T a00() { return (T)  1./6.; }
+		static T a01() { return (T) -3./6.; }
+		static T a02() { return (T)  3./6.; }
+		static T a03() { return (T) -1./6.; }
+		static T a10() { return (T)  4./6.; }
+		static T a11() { return      0;     }
+		static T a12() { return (T) -6./6.; }
+		static T a13() { return (T)  3./6.; }
+		static T a20() { return (T)  1./6.; }
+		static T a21() { return (T)  3./6.; }
+		static T a22() { return (T)  3./6.; }
+		static T a23() { return (T)- 3./6.; }
+		static T a30() { return      0;     }
+		static T a31() { return      0;     }
+		static T a32() { return      0;     }
+		static T a33() { return (T)  1./6.; }
+	};
+
+	template<class T>
+	inline T clamp(T a, T lower, T upper)
+	{
+		return (a < lower) ? lower : 
+	   		   (a > upper) ? upper : a;
+	}
+}
+
+template<typename KERNEL>
+struct CubicKernel
+{
+	typedef typename KERNEL					KernelInternal;
+	typedef typename KERNEL::FloatType		FloatType;
+
+	static FloatType kernel(FloatType x)
+	{
+		x = fabs(x);
+		if (x >= (FloatType)2.)
+			return 0.0f;
+		if (x <= (FloatType)1.) {
+			FloatType x2 = x * x;
+			FloatType x3 = x2 * x;
+			return KERNEL::a10() + KERNEL::a11() * x + KERNEL::a12() * x2 + KERNEL::a13() * x3;
+		}
+		assert(x > (FloatType)1. && x < (FloatType)2.);
+		x -= (FloatType)1.;
+		FloatType x2 = x * x;
+		FloatType x3 = x2 * x;
+		return KERNEL::a00() + KERNEL::a01() * x + KERNEL::a02() * x2 + KERNEL::a03() * x3;
+	}
+
+	static FloatType interpolate(FloatType f0, FloatType f1, FloatType f2, FloatType f3, FloatType x)
+	{
+		const FloatType  x2 = x*x;
+		const FloatType  x3 = x*x*x;
+		return f0*(KERNEL::a00() + KERNEL::a01() * x + KERNEL::a02() * x2 + KERNEL::a03() * x3) +
+			   f1*(KERNEL::a10() + KERNEL::a11() * x + KERNEL::a12() * x2 + KERNEL::a13() * x3) +
+			   f2*(KERNEL::a20() + KERNEL::a21() * x + KERNEL::a22() * x2 + KERNEL::a23() * x3) + 
+			   f3*(KERNEL::a30() + KERNEL::a31() * x + KERNEL::a32() * x2 + KERNEL::a33() * x3);
+	}
+};
+
+// Linear splines
+typedef CubicKernel<BicubicInternal::LinearKernel<float>>					LinearKernelf;
+typedef CubicKernel<BicubicInternal::LinearKernel<double>>					LinearKerneld;
+// Catmul-Rom splines
+typedef CubicKernel<BicubicInternal::CubicCatmulRomKernel<float>>			CubicCatmulRomKernelf;
+typedef CubicKernel<BicubicInternal::CubicCatmulRomKernel<double>>			CubicCatmulRomKerneld;
+typedef CubicKernel<BicubicInternal::CubicCatmulRomKernel<float>>			CubicInterpolationKernelf;
+typedef CubicKernel<BicubicInternal::CubicCatmulRomKernel<double>>			CubicInterpolationKerneld;
+// Cubic B-splines
+typedef CubicKernel<BicubicInternal::CubicBSplineKernel<float>>				CubicBSplineKernelf;
+typedef CubicKernel<BicubicInternal::CubicBSplineKernel<double>>			CubicBSplineKerneld;
+
+template<typename KERNEL, typename Derived>
+static float cubic_interpolate(const Eigen::ArrayBase<Derived> &F, const typename KERNEL::FloatType pt, const typename KERNEL::FloatType dx)
+{
+	typedef typename KERNEL::FloatType T;
+	const int w  = int(F.size());
+	const int ix = (int)floor(pt);
+	const T   s  = pt - (T)ix;
+
+	if (ix > 1 && ix + 2 < w) {
+		// Inside the fully interpolated region.
+		return KERNEL::interpolate(F[ix - 1], F[ix], F[ix + 1], F[ix + 2], s);
+	}
+	// Transition region. Extend with a constant function.
+	auto f = [&F, w](x) { return F[BicubicInternal::clamp(x, 0, w - 1)]; }
+	return KERNEL::interpolate(f(ix - 1), f(ix), f(ix + 1), f(ix + 2), s);
+}
+
+template<typename KERNEL, typename Derived>
+static float bicubic_interpolate(const Eigen::MatrixBase<Derived> &F, const Eigen::Matrix<typename KERNEL::FloatType, 2, 1, Eigen::DontAlign> &pt, const typename KERNEL::FloatType dx)
+{
+	typedef typename KERNEL::FloatType T;
+	const int w  = F.cols();
+	const int h  = F.rows();
+	const int ix = (int)floor(pt[0]);
+	const int iy = (int)floor(pt[1]);
+	const T   s  = pt[0] - (T)ix;
+	const T   t  = pt[1] - (T)iy;
+
+	if (ix > 1 && ix + 2 < w && iy > 1 && iy + 2 < h) {
+		// Inside the fully interpolated region.
+		return KERNEL::interpolate(
+			KERNEL::interpolate(F(ix-1,iy-1),F(ix  ,iy-1),F(ix+1,iy-1),F(ix+2,iy-1),s),
+			KERNEL::interpolate(F(ix-1,iy  ),F(ix  ,iy  ),F(ix+1,iy  ),F(ix+2,iy  ),s),
+			KERNEL::interpolate(F(ix-1,iy+1),F(ix  ,iy+1),F(ix+1,iy+1),F(ix+2,iy+1),s),
+			KERNEL::interpolate(F(ix-1,iy+2),F(ix  ,iy+2),F(ix+1,iy+2),F(ix+2,iy+2),s),t);
+	}
+	// Transition region. Extend with a constant function.
+	auto f = [&f, w, h](int x, int y) { return F(BicubicInternal::clamp(x,0,w-1),BicubicInternal::clamp(y,0,h-1)); }
+	return KERNEL::interpolate(
+		KERNEL::interpolate(f(ix-1,iy-1),f(ix  ,iy-1),f(ix+1,iy-1),f(ix+2,iy-1),s),
+		KERNEL::interpolate(f(ix-1,iy  ),f(ix  ,iy  ),f(ix+1,iy  ),f(ix+2,iy  ),s),
+		KERNEL::interpolate(f(ix-1,iy+1),f(ix  ,iy+1),f(ix+1,iy+1),f(ix+2,iy+1),s),
+		KERNEL::interpolate(f(ix-1,iy+2),f(ix  ,iy+2),f(ix+1,iy+2),f(ix+2,iy+2),s),t);
+}
+
+} // namespace Slic3r
+
+#endif /* BICUBIC_HPP */

src/libslic3r/SLA/SLABasePool.cpp

@@ -31,7 +31,9 @@ Contour3D convert(const Polygons& triangles, coord_t z, bool dir) {
 }
 
 Contour3D walls(const ExPolygon& floor_plate, const ExPolygon& ceiling,
-                       double floor_z_mm, double ceiling_z_mm) {
+                double floor_z_mm, double ceiling_z_mm,
+                ThrowOnCancel thr)
+{
     using std::transform; using std::back_inserter;
 
     ExPolygon poly;
@@ -61,8 +63,10 @@ Contour3D walls(const ExPolygon& floor_plate, const ExPolygon& ceiling,
     };
 
     std::for_each(tri.begin(), tri.end(),
-                  [&rp, &rpi, &poly, &idx, is_upper, fz, cz](const Polygon& pp)
+                  [&rp, &rpi, thr, &idx, is_upper, fz, cz](const Polygon& pp)
     {
+        thr(); // may throw if cancellation was requested
+
         for(auto& p : pp.points)
             if(is_upper(p))
                 rp.emplace_back(unscale(x(p), y(p), mm(cz)));
@@ -213,11 +217,12 @@ inline Contour3D roofs(const ExPolygon& poly, coord_t z_distance) {
 
 template<class ExP, class D>
 Contour3D round_edges(const ExPolygon& base_plate,
-                            double radius_mm,
-                            double degrees,
-                            double ceilheight_mm,
-                            bool dir,
-                            ExP&& last_offset = ExP(), D&& last_height = D())
+                      double radius_mm,
+                      double degrees,
+                      double ceilheight_mm,
+                      bool dir,
+                      ThrowOnCancel throw_on_cancel,
+                      ExP&& last_offset = ExP(), D&& last_height = D())
 {
     auto ob = base_plate;
     auto ob_prev = ob;
@@ -231,6 +236,8 @@ Contour3D round_edges(const ExPolygon& base_plate,
 
     if(degrees >= 90) {
         for(int i = 1; i <= steps; ++i) {
+            throw_on_cancel();
+
             ob = base_plate;
 
             double r2 = radius_mm * radius_mm;
@@ -242,7 +249,7 @@ Contour3D round_edges(const ExPolygon& base_plate,
             wh = ceilheight_mm - radius_mm + stepy;
 
             Contour3D pwalls;
-            pwalls = walls(ob, ob_prev, wh, wh_prev);
+            pwalls = walls(ob, ob_prev, wh, wh_prev, throw_on_cancel);
 
             curvedwalls.merge(pwalls);
             ob_prev = ob;
@@ -254,6 +261,7 @@ Contour3D round_edges(const ExPolygon& base_plate,
     int tos = int(tox / stepx);
 
     for(int i = 1; i <= tos; ++i) {
+        throw_on_cancel();
         ob = base_plate;
 
         double r2 = radius_mm * radius_mm;
@@ -264,7 +272,7 @@ Contour3D round_edges(const ExPolygon& base_plate,
         wh = ceilheight_mm - radius_mm - stepy;
 
         Contour3D pwalls;
-        pwalls = walls(ob_prev, ob, wh_prev, wh);
+        pwalls = walls(ob_prev, ob, wh_prev, wh, throw_on_cancel);
 
         curvedwalls.merge(pwalls);
         ob_prev = ob;
@@ -348,7 +356,8 @@ inline Point centroid(const ExPolygon& poly) {
 /// with explicit bridges. Bridges are generated from each shape's centroid
 /// to the center of the "scene" which is the centroid calculated from the shape
 /// centroids (a star is created...)
-ExPolygons concave_hull(const ExPolygons& polys, double max_dist_mm = 50)
+ExPolygons concave_hull(const ExPolygons& polys, double max_dist_mm = 50,
+                        ThrowOnCancel throw_on_cancel = [](){})
 {
     namespace bgi = boost::geometry::index;
     using SpatElement = std::pair<BoundingBox, unsigned>;
@@ -383,9 +392,10 @@ ExPolygons concave_hull(const ExPolygons& polys, double max_dist_mm = 50)
     idx = 0;
     std::transform(centroids.begin(), centroids.end(),
                    std::back_inserter(punion),
-                   [&punion, &boxindex, cc, max_dist_mm, &idx](const Point& c)
+                   [&punion, &boxindex, cc, max_dist_mm, &idx, throw_on_cancel]
+                   (const Point& c)
     {
-
+        throw_on_cancel();
         double dx = x(c) - x(cc), dy = y(c) - y(cc);
         double l = std::sqrt(dx * dx + dy * dy);
         double nx = dx / l, ny = dy / l;
@@ -419,7 +429,7 @@ ExPolygons concave_hull(const ExPolygons& polys, double max_dist_mm = 50)
 }
 
 void base_plate(const TriangleMesh &mesh, ExPolygons &output, float h,
-                float layerh)
+                float layerh, ThrowOnCancel thrfn)
 {
     TriangleMesh m = mesh;
     TriangleMeshSlicer slicer(&m);
@@ -431,7 +441,7 @@ void base_plate(const TriangleMesh &mesh, ExPolygons &output, float h,
         heights.emplace_back(hi);
 
     std::vector<ExPolygons> out; out.reserve(size_t(std::ceil(h/layerh)));
-    slicer.slice(heights, &out, [](){});
+    slicer.slice(heights, &out, thrfn);
 
     size_t count = 0; for(auto& o : out) count += o.size();
     ExPolygons tmp; tmp.reserve(count);
@@ -447,7 +457,7 @@ void create_base_pool(const ExPolygons &ground_layer, TriangleMesh& out,
     double mdist = 2*(1.8*cfg.min_wall_thickness_mm + 4*cfg.edge_radius_mm) +
                    cfg.max_merge_distance_mm;
 
-    auto concavehs = concave_hull(ground_layer, mdist);
+    auto concavehs = concave_hull(ground_layer, mdist, cfg.throw_on_cancel);
     for(ExPolygon& concaveh : concavehs) {
         if(concaveh.contour.points.empty()) return;
         concaveh.holes.clear();
@@ -505,6 +515,7 @@ void create_base_pool(const ExPolygons &ground_layer, TriangleMesh& out,
                                        phi,  // 170 degrees
                                        0,    // z position of the input plane
                                        true,
+                                       cfg.throw_on_cancel,
                                        ob, wh);
 
         pool.merge(curvedwalls);
@@ -512,7 +523,8 @@ void create_base_pool(const ExPolygons &ground_layer, TriangleMesh& out,
         ExPolygon ob_contr = ob;
         ob_contr.holes.clear();
 
-        auto pwalls = walls(ob_contr, inner_base, wh, -cfg.min_wall_height_mm);
+        auto pwalls = walls(ob_contr, inner_base, wh, -cfg.min_wall_height_mm,
+                            cfg.throw_on_cancel);
         pool.merge(pwalls);
 
         Polygons top_triangles, bottom_triangles;
@@ -528,6 +540,7 @@ void create_base_pool(const ExPolygons &ground_layer, TriangleMesh& out,
                                   90,   // 90 degrees
                                   0,    // z position of the input plane
                                   false,
+                                  cfg.throw_on_cancel,
                                   ob, wh);
         pool.merge(curvedwalls);
 

src/libslic3r/SLA/SLABasePool.hpp

@@ -2,6 +2,7 @@
 #define SLABASEPOOL_HPP
 
 #include <vector>
+#include <functional>
 
 namespace Slic3r {
 
@@ -11,12 +12,14 @@ class TriangleMesh;
 namespace sla {
 
 using ExPolygons = std::vector<ExPolygon>;
+using ThrowOnCancel = std::function<void(void)>;
 
 /// Calculate the polygon representing the silhouette from the specified height
-void base_plate(const TriangleMesh& mesh,
-                ExPolygons& output,
-                float zlevel = 0.1f,
-                float layerheight = 0.05f);
+void base_plate(const TriangleMesh& mesh,       // input mesh
+                ExPolygons& output,             // Output will be merged with
+                float zlevel = 0.1f,            // Plate creation level
+                float layerheight = 0.05f,      // The sampling height
+                ThrowOnCancel thrfn = [](){});  // Will be called frequently
 
 struct PoolConfig {
     double min_wall_thickness_mm = 2;
@@ -24,6 +27,8 @@ struct PoolConfig {
     double max_merge_distance_mm = 50;
     double edge_radius_mm = 1;
 
+    ThrowOnCancel throw_on_cancel = [](){};
+
     inline PoolConfig() {}
     inline PoolConfig(double wt, double wh, double md, double er):
         min_wall_thickness_mm(wt),
@@ -35,8 +40,7 @@ struct PoolConfig {
 /// Calculate the pool for the mesh for SLA printing
 void create_base_pool(const ExPolygons& base_plate,
                       TriangleMesh& output_mesh,
-                      const PoolConfig& = PoolConfig()
-                      );
+                      const PoolConfig& = PoolConfig());
 
 /// TODO: Currently the base plate of the pool will have half the height of the
 /// whole pool. So the carved out space has also half the height. This is not

src/libslic3r/SLA/SLABoilerPlate.hpp

@@ -58,7 +58,7 @@ struct Contour3D {
         points.insert(points.end(), ctr.points.begin(), ctr.points.end());
         indices.insert(indices.end(), ctr.indices.begin(), ctr.indices.end());
 
-        for(auto n = s; n < indices.size(); n++) {
+        for(size_t n = s; n < indices.size(); n++) {
             auto& idx = indices[n]; x(idx) += s3; y(idx) += s3; z(idx) += s3;
         }
     }

src/libslic3r/SLA/SLASupportTree.cpp

@@ -515,8 +515,13 @@ struct Pad {
         zlevel(ground_level + sla::get_pad_elevation(pcfg))
     {
         ExPolygons basep;
+        cfg.throw_on_cancel();
+
+        // The 0.1f is the layer height with which the mesh is sampled and then
+        // the layers are unified into one vector of polygons.
         base_plate(object_support_mesh, basep,
-                   float(cfg.min_wall_height_mm)/*,layer_height*/);
+                   float(cfg.min_wall_height_mm), 0.1f, pcfg.throw_on_cancel);
+
         for(auto& bp : baseplate) basep.emplace_back(bp);
 
         create_base_pool(basep, tmesh, cfg);
@@ -622,12 +627,19 @@ class SLASupportTree::Impl {
     std::vector<Junction> m_junctions;
     std::vector<Bridge> m_bridges;
     std::vector<CompactBridge> m_compact_bridges;
+    Controller m_ctl;
+
     Pad m_pad;
     mutable TriangleMesh meshcache; mutable bool meshcache_valid;
     mutable double model_height = 0; // the full height of the model
 public:
     double ground_level = 0;
 
+    Impl() = default;
+    inline Impl(const Controller& ctl): m_ctl(ctl) {}
+
+    const Controller& ctl() const { return m_ctl; }
+
     template<class...Args> Head& add_head(Args&&... args) {
         m_heads.emplace_back(std::forward<Args>(args)...);
         m_heads.back().id = long(m_heads.size() - 1);
@@ -710,27 +722,38 @@ public:
         meshcache = TriangleMesh();
 
         for(auto& head : heads()) {
+            if(m_ctl.stopcondition()) break;
             auto&& m = mesh(head.mesh);
             meshcache.merge(m);
         }
 
         for(auto& stick : pillars()) {
+            if(m_ctl.stopcondition()) break;
             meshcache.merge(mesh(stick.mesh));
             meshcache.merge(mesh(stick.base));
         }
 
         for(auto& j : junctions()) {
+            if(m_ctl.stopcondition()) break;
             meshcache.merge(mesh(j.mesh));
         }
 
         for(auto& cb : compact_bridges()) {
+            if(m_ctl.stopcondition()) break;
             meshcache.merge(mesh(cb.mesh));
         }
 
         for(auto& bs : bridges()) {
+            if(m_ctl.stopcondition()) break;
             meshcache.merge(mesh(bs.mesh));
         }
 
+        if(m_ctl.stopcondition()) {
+            // In case of failure we have to return an empty mesh
+            meshcache = TriangleMesh();
+            return meshcache;
+        }
+
         // TODO: Is this necessary?
         meshcache.repair();
 
@@ -1347,7 +1370,7 @@ bool SLASupportTree::generate(const PointSet &points,
                         add_base(cfg.base_height_mm, cfg.base_radius_mm);
 
                     // connects to ground, eligible for bridging
-                    cl_centroids.emplace_back(sidehead.id);
+                    cl_centroids.emplace_back(c);
                 } else {
                     // Creating the bridge to the nearest pillar
 
@@ -1659,22 +1682,19 @@ SlicedSupports SLASupportTree::slice(float layerh, float init_layerh) const
     fullmesh.merge(get_pad());
     TriangleMeshSlicer slicer(&fullmesh);
     SlicedSupports ret;
-    slicer.slice(heights, &ret, m_ctl.cancelfn);
+    slicer.slice(heights, &ret, get().ctl().cancelfn);
 
     return ret;
 }
 
 const TriangleMesh &SLASupportTree::add_pad(const SliceLayer& baseplate,
-                                            double min_wall_thickness_mm,
-                                            double min_wall_height_mm,
-                                            double max_merge_distance_mm,
-                                            double edge_radius_mm) const
+                                            const PoolConfig& pcfg) const
 {
-    PoolConfig pcfg;
-    pcfg.min_wall_thickness_mm = min_wall_thickness_mm;
-    pcfg.min_wall_height_mm    = min_wall_height_mm;
-    pcfg.max_merge_distance_mm = max_merge_distance_mm;
-    pcfg.edge_radius_mm        = edge_radius_mm;
+//    PoolConfig pcfg;
+//    pcfg.min_wall_thickness_mm = min_wall_thickness_mm;
+//    pcfg.min_wall_height_mm    = min_wall_height_mm;
+//    pcfg.max_merge_distance_mm = max_merge_distance_mm;
+//    pcfg.edge_radius_mm        = edge_radius_mm;
     return m_impl->create_pad(merged_mesh(), baseplate, pcfg).tmesh;
 }
 
@@ -1687,14 +1707,14 @@ SLASupportTree::SLASupportTree(const PointSet &points,
                                const EigenMesh3D& emesh,
                                const SupportConfig &cfg,
                                const Controller &ctl):
-    m_impl(new Impl()), m_ctl(ctl)
+    m_impl(new Impl(ctl))
 {
     m_impl->ground_level = emesh.ground_level - cfg.object_elevation_mm;
     generate(points, emesh, cfg, ctl);
 }
 
 SLASupportTree::SLASupportTree(const SLASupportTree &c):
-    m_impl(new Impl(*c.m_impl)), m_ctl(c.m_ctl) {}
+    m_impl(new Impl(*c.m_impl)) {}
 
 SLASupportTree &SLASupportTree::operator=(const SLASupportTree &c)
 {

src/libslic3r/SLA/SLASupportTree.hpp

@@ -69,6 +69,8 @@ struct SupportConfig {
     double object_elevation_mm = 10;
 };
 
+struct PoolConfig;
+
 /// A Control structure for the support calculation. Consists of the status
 /// indicator callback and the stop condition predicate.
 struct Controller {
@@ -119,7 +121,6 @@ public:
 class SLASupportTree {
     class Impl;
     std::unique_ptr<Impl> m_impl;
-    Controller m_ctl;
 
     Impl& get() { return *m_impl; }
     const Impl& get() const { return *m_impl; }
@@ -158,10 +159,7 @@ public:
 
     /// Adding the "pad" (base pool) under the supports
     const TriangleMesh& add_pad(const SliceLayer& baseplate,
-                                double min_wall_thickness_mm,
-                                double min_wall_height_mm,
-                                double max_merge_distance_mm,
-                                double edge_radius_mm) const;
+                                const PoolConfig& pcfg) const;
 
     /// Get the pad geometry
     const TriangleMesh& get_pad() const;

src/libslic3r/SLAPrint.cpp

@@ -445,7 +445,7 @@ void SLAPrint::process()
 
     // Slicing the model object. This method is oversimplified and needs to
     // be compared with the fff slicing algorithm for verification
-    auto slice_model = [this, ilh, ilhd](SLAPrintObject& po) {
+    auto slice_model = [this, ilh](SLAPrintObject& po) {
         double lh = po.m_config.layer_height.getFloat();
 
         TriangleMesh mesh = po.transformed_mesh();
@@ -530,6 +530,11 @@ void SLAPrint::process()
             po.m_supportdata->support_tree_ptr.reset(
                         new SLASupportTree(pts, emesh, scfg, ctl));
 
+            // Create the unified mesh
+            auto rc = SlicingStatus::RELOAD_SCENE;
+            set_status(-1, L("Visualizing supports"));
+            po.m_supportdata->support_tree_ptr->merged_mesh();
+            set_status(-1, L("Visualizing supports"), rc);
         } catch(sla::SLASupportsStoppedException&) {
             // no need to rethrow
             // throw_if_canceled();
@@ -560,18 +565,23 @@ void SLAPrint::process()
             auto&& trmesh = po.transformed_mesh();
 
             // This call can get pretty time consuming
-            if(elevation < pad_h) sla::base_plate(trmesh, bp,
-                                                  float(pad_h), float(lh));
+            auto thrfn = [this](){ throw_if_canceled(); };
 
-            po.m_supportdata->support_tree_ptr->add_pad(bp, wt, h, md, er);
+            if(elevation < pad_h)
+                sla::base_plate(trmesh, bp, float(pad_h), float(lh),
+                                            thrfn);
+
+            pcfg.throw_on_cancel = thrfn;
+            po.m_supportdata->support_tree_ptr->add_pad(bp, pcfg);
         }
 
-        // if the base pool (which means also the support tree) is
-        // done, do a refresh when indicating progress. Now the
-        // geometries for the supports and the optional base pad are
-        // ready. We can grant access for the control thread to read
-        // the geometries, but first we have to update the caches:
-        po.support_mesh(); /*po->pad_mesh();*/
+//        // if the base pool (which means also the support tree) is
+//        // done, do a refresh when indicating progress. Now the
+//        // geometries for the supports and the optional base pad are
+//        // ready. We can grant access for the control thread to read
+//        // the geometries, but first we have to update the caches:
+//        po.support_mesh(); /*po->pad_mesh();*/
+        po.throw_if_canceled();
         auto rc = SlicingStatus::RELOAD_SCENE;
         set_status(-1, L("Visualizing supports"), rc);
     };
@@ -589,9 +599,9 @@ void SLAPrint::process()
 
     // We have the layer polygon collection but we need to unite them into
     // an index where the key is the height level in discrete levels (clipper)
-    auto index_slices = [this, ilh, ilhd](SLAPrintObject& po) {
+    auto index_slices = [ilhd](SLAPrintObject& po) {
         po.m_slice_index.clear();
-        auto sih = LevelID(scale_(ilh));
+        auto sih = LevelID(scale_(ilhd));
 
         // For all print objects, go through its initial layers and place them
         // into the layers hash
@@ -635,7 +645,7 @@ void SLAPrint::process()
         // shortcut for empty index into the slice vectors
         static const auto EMPTY_SLICE = SLAPrintObject::SliceRecord::NONE;
         
-        for(int i = 0; i < oslices.size(); ++i) {
+        for(size_t i = 0; i < oslices.size(); ++i) {
             LevelID h = levelids[i];
 
             float fh = float(double(h) * SCALING_FACTOR);
@@ -652,7 +662,7 @@ void SLAPrint::process()
             po.m_supportdata->level_ids.clear();
             po.m_supportdata->level_ids.reserve(sslices.size());
 
-            for(int i = 0; i < sslices.size(); ++i) {
+            for(int i = 0; i < int(sslices.size()); ++i) {
                 int a = i == 0 ? 0 : 1;
                 int b = i == 0 ? 0 : i - 1;
                 LevelID h = sminZ + a * sih + b * slh;
@@ -662,7 +672,7 @@ void SLAPrint::process()
 
                 SLAPrintObject::SliceRecord& sr = po.m_slice_index[fh];
                 assert(sr.support_slices_idx == EMPTY_SLICE);
-                sr.support_slices_idx = i;
+                sr.support_slices_idx = SLAPrintObject::SliceRecord::Idx(i);
             }
         }
     };
@@ -670,7 +680,7 @@ void SLAPrint::process()
     auto& levels = m_printer_input;
 
     // Rasterizing the model objects, and their supports
-    auto rasterize = [this, ilh, ilhd, max_objstatus, &levels]() {
+    auto rasterize = [this, max_objstatus, &levels]() {
         if(canceled()) return;
 
         // clear the rasterizer input
@@ -688,14 +698,14 @@ void SLAPrint::process()
             // now merge this object's support and object slices with the rest
             // of the print object slices
 
-            for(int i = 0; i < oslices.size(); ++i) {
+            for(size_t i = 0; i < oslices.size(); ++i) {
                 auto& lyrs = levels[gndlvl + po.m_level_ids[i]];
                 lyrs.emplace_back(oslices[i], po.m_instances);
             }
 
             if(!po.m_supportdata) continue;
             auto& sslices = po.m_supportdata->support_slices;
-            for(int i = 0; i < sslices.size(); ++i) {
+            for(size_t i = 0; i < sslices.size(); ++i) {
                 auto& lyrs = levels[gndlvl + po.m_supportdata->level_ids[i]];
                 lyrs.emplace_back(sslices[i], po.m_instances);
             }
@@ -713,8 +723,8 @@ void SLAPrint::process()
 
             double w = printcfg.display_width.getFloat();
             double h = printcfg.display_height.getFloat();
-            unsigned pw = printcfg.display_pixels_x.getInt();
-            unsigned ph = printcfg.display_pixels_y.getInt();
+            auto pw = unsigned(printcfg.display_pixels_x.getInt());
+            auto ph = unsigned(printcfg.display_pixels_y.getInt());
             double lh = ocfg.layer_height.getFloat();
             double exp_t = matcfg.exposure_time.getFloat();
             double iexp_t = matcfg.initial_exposure_time.getFloat();
@@ -926,6 +936,18 @@ bool SLAPrint::invalidate_state_by_config_options(const std::vector<t_config_opt
     return invalidated;
 }
 
+// Returns true if an object step is done on all objects and there's at least one object.
+bool SLAPrint::is_step_done(SLAPrintObjectStep step) const
+{
+    if (m_objects.empty())
+        return false;
+    tbb::mutex::scoped_lock lock(this->state_mutex());
+    for (const SLAPrintObject *object : m_objects)
+        if (! object->m_state.is_done_unguarded(step))
+            return false;
+    return true;
+}
+
 SLAPrintObject::SLAPrintObject(SLAPrint *print, ModelObject *model_object):
     Inherited(print, model_object),
     m_stepmask(slaposCount, true),
@@ -1098,7 +1120,9 @@ TriangleMesh SLAPrintObject::get_mesh(SLAPrintObjectStep step) const
 const TriangleMesh& SLAPrintObject::support_mesh() const
 {
     if(m_config.supports_enable.getBool() && m_supportdata &&
-       m_supportdata->support_tree_ptr) return m_supportdata->support_tree_ptr->merged_mesh();
+       m_supportdata->support_tree_ptr) {
+        return m_supportdata->support_tree_ptr->merged_mesh();
+    }
 
     return EMPTY_MESH;
 }

src/libslic3r/SLAPrint.hpp

@@ -185,6 +185,9 @@ public:
     bool                empty() const override { return m_objects.empty(); }
     ApplyStatus         apply(const Model &model, const DynamicPrintConfig &config) override;
     void                process() override;
+    bool                is_step_done(SLAPrintObjectStep step) const;
+    // Returns true if the last step was finished with success.
+    bool                finished() const override { return this->is_step_done(slaposIndexSlices); }
 
     template<class Fmt> void export_raster(const std::string& fname) {
         if(m_printer) m_printer->save<Fmt>(fname);

src/slic3r/GUI/AppConfig.cpp

@@ -16,6 +16,7 @@
 #include <boost/property_tree/ini_parser.hpp>
 #include <boost/property_tree/ptree.hpp>
 #include <boost/algorithm/string/predicate.hpp>
+#include <boost/format.hpp>
 
 namespace Slic3r {
 
@@ -125,8 +126,13 @@ void AppConfig::load()
 
 void AppConfig::save()
 {
+    // The config is first written to a file with a PID suffix and then moved
+    // to avoid race conditions with multiple instances of Slic3r
+    const auto path = config_path();
+    std::string path_pid = (boost::format("%1%.%2%") % path % get_current_pid()).str();
+
     boost::nowide::ofstream c;
-    c.open(AppConfig::config_path(), std::ios::out | std::ios::trunc);
+    c.open(path_pid, std::ios::out | std::ios::trunc);
     c << "# " << Slic3r::header_slic3r_generated() << std::endl;
     // Make sure the "no" category is written first.
     for (const std::pair<std::string, std::string> &kvp : m_storage[""])
@@ -155,6 +161,8 @@ void AppConfig::save()
         }
     }
     c.close();
+
+    rename_file(path_pid, path);
     m_dirty = false;
 }
 

src/slic3r/GUI/BackgroundSlicingProcess.hpp

@@ -110,6 +110,11 @@ public:
 	State 	state() 	const { return m_state; }
 	bool    idle() 		const { return m_state == STATE_IDLE; }
 	bool    running() 	const { return m_state == STATE_STARTED || m_state == STATE_RUNNING || m_state == STATE_FINISHED || m_state == STATE_CANCELED; }
+    // Returns true if the last step of the active print was finished with success.
+    // The "finished" flag is reset by the apply() method, if it changes the state of the print.
+    // This "finished" flag does not account for the final export of the output file (.gcode or zipped PNGs),
+    // and it does not account for the OctoPrint scheduling.
+    bool    finished() const { return m_print->finished(); }
 
 private:
 	void 	thread_proc();

src/slic3r/GUI/Plater.cpp

@@ -323,17 +323,17 @@ FreqChangedParams::FreqChangedParams(wxWindow* parent, const int label_width) :
                 double brim_width = config->opt_float("brim_width");
                 if (boost::any_cast<bool>(value) == true)
                 {
-                    new_val = m_brim_width == 0.0 ? 10 :
+                    new_val = m_brim_width == 0.0 ? 5 :
                         m_brim_width < 0.0 ? m_brim_width * (-1) :
                         m_brim_width;
                 }
-                else{
+                else {
                     m_brim_width = brim_width * (-1);
                     new_val = 0;
                 }
                 new_conf.set_key_value("brim_width", new ConfigOptionFloat(new_val));
             }
-            else{ //(opt_key == "support")
+            else { //(opt_key == "support")
                 const wxString& selection = boost::any_cast<wxString>(value);
 
                 auto support_material = selection == _("None") ? false : true;
@@ -2212,6 +2212,7 @@ void Plater::priv::set_current_panel(wxPanel* panel)
     }
     else if (current_panel == preview)
     {
+        this->q->reslice();        
         preview->reload_print();
         preview->set_canvas_as_dirty();
     }
@@ -3064,7 +3065,7 @@ void Plater::reslice()
 #else
         this->p->canvas3D->reload_scene(false);
 #endif // ENABLE_REMOVE_TABS_FROM_PLATER
-    if ((state & priv::UPDATE_BACKGROUND_PROCESS_INVALID) == 0 && !this->p->background_process.running()) {
+    if ((state & priv::UPDATE_BACKGROUND_PROCESS_INVALID) == 0 && !this->p->background_process.running() && !this->p->background_process.finished()) {
         // The print is valid and it can be started.
         if (this->p->background_process.start())
 			this->p->statusbar()->set_cancel_callback([this]() {

xs/xsp/Print.xsp

@@ -49,8 +49,6 @@ _constant()
     Ref<StaticPrintConfig> config()
         %code%{ RETVAL = &THIS->config(); %};
     Points copies();
-    t_layer_height_ranges layer_height_ranges()
-        %code%{ RETVAL = THIS->layer_height_ranges; %};
     std::vector<double> layer_height_profile()
         %code%{ RETVAL = THIS->layer_height_profile; %};
     Clone<BoundingBox> bounding_box();
@@ -58,9 +56,6 @@ _constant()
     Points _shifted_copies()
         %code%{ RETVAL = THIS->copies(); %};
 
-    void set_layer_height_ranges(t_layer_height_ranges layer_height_ranges)
-        %code%{ THIS->layer_height_ranges = layer_height_ranges; %};
-
     size_t layer_count();
     Ref<Layer> get_layer(int idx);