3DPrinting/PrusaSlicer-NonPlainar
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Added support for ignoring of tiny extrusion drops which are usually not worth the supports.

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However, it is disabled, as it can currently result in unsupported large columns
This commit is contained in:
PavelMikus 2022-08-23 14:46:08 +02:00
parent 15d0c55d54
commit f17e3f2c8b
2 changed files with 50 additions and 40 deletions
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75
src/libslic3r/SupportSpotsGenerator.cpp
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@ -41,7 +41,7 @@ public:
bool is_external_perimeter() const { bool is_external_perimeter() const {
assert(origin_entity != nullptr); assert(origin_entity != nullptr);
return origin_entity->role() == erExternalPerimeter; return origin_entity->role() == erExternalPerimeter || origin_entity->role() == erOverhangPerimeter;
} }
Vec2f a; Vec2f a;
@ -364,8 +364,10 @@ void check_extrusion_entity_stability(const ExtrusionEntity *entity,
return Vec3f(point.x(), point.y(), layer_z); return Vec3f(point.x(), point.y(), layer_z);
}; };
float overhang_dist = tan(params.overhang_angle_deg * PI / 180.0f) * layer_region->layer()->height; float overhang_dist = tan(params.overhang_angle_deg * PI / 180.0f) * layer_region->layer()->height;
float min_malformation_dist = tan(params.malformation_angle_span_deg.first * PI / 180.0f)*layer_region->layer()->height; float min_malformation_dist = tan(params.malformation_angle_span_deg.first * PI / 180.0f)
float max_malformation_dist = tan(params.malformation_angle_span_deg.second * PI / 180.0f)*layer_region->layer()->height; * layer_region->layer()->height;
float max_malformation_dist = tan(params.malformation_angle_span_deg.second * PI / 180.0f)
* layer_region->layer()->height;
Points points { }; Points points { };
entity->collect_points(points); entity->collect_points(points);
@ -387,9 +389,14 @@ void check_extrusion_entity_stability(const ExtrusionEntity *entity,
} }
} }
if (entity->total_volume() < params.supportable_volume_threshold) {
checked_lines_out.insert(checked_lines_out.end(), lines.begin(), lines.end());
return;
}
ExtrusionPropertiesAccumulator bridging_acc { }; ExtrusionPropertiesAccumulator bridging_acc { };
ExtrusionPropertiesAccumulator malformation_acc { }; ExtrusionPropertiesAccumulator malformation_acc { };
bridging_acc.add_distance(params.bridge_distance); bridging_acc.add_distance(params.bridge_distance + 1.0f);
const float flow_width = get_flow_width(layer_region, entity->role()); const float flow_width = get_flow_width(layer_region, entity->role());
for (size_t line_idx = 0; line_idx < lines.size(); ++line_idx) { for (size_t line_idx = 0; line_idx < lines.size(); ++line_idx) {
@ -433,8 +440,11 @@ void check_extrusion_entity_stability(const ExtrusionEntity *entity,
} }
if (dist_from_prev_layer > min_malformation_dist && dist_from_prev_layer < max_malformation_dist) { if (dist_from_prev_layer > min_malformation_dist && dist_from_prev_layer < max_malformation_dist) {
malformation_acc.add_distance(current_line.len); malformation_acc.add_distance(current_line.len);
current_line.malformation += layer_region->layer()->height * (0.5f + current_line.malformation += layer_region->layer()->height
1.5f * (malformation_acc.max_curvature / PI) * gauss(malformation_acc.distance, 5.0f, 1.0f, 0.2f)); * (0.5f
+
1.5f * (malformation_acc.max_curvature / PI)
* gauss(malformation_acc.distance, 5.0f, 1.0f, 0.2f));
} else { } else {
malformation_acc.reset(); malformation_acc.reset();
} }
@ -464,12 +474,13 @@ std::tuple<LayerIslands, PixelGrid> reckon_islands(
} }
} }
std::vector<LinesDistancer> islands; // these search trees will be used to determine to which island does the extrusion begin std::vector<LinesDistancer> islands; // these search trees will be used to determine to which island does the extrusion belong.
std::vector<std::vector<size_t>> island_extrusions; //final assigment of each extrusion to an island std::vector<std::vector<size_t>> island_extrusions; //final assigment of each extrusion to an island.
// initliaze the search from external perimeters - at the beginning, there is island candidate for each external perimeter. // initliaze the search from external perimeters - at the beginning, there is island candidate for each external perimeter.
// some of them will disappear (e.g. holes) // some of them will disappear (e.g. holes)
for (size_t e = 0; e < extrusions.size(); ++e) { for (size_t e = 0; e < extrusions.size(); ++e) {
if (layer_lines[extrusions[e].first].is_external_perimeter()) { if (layer_lines[extrusions[e].first].origin_entity->is_loop() &&
layer_lines[extrusions[e].first].is_external_perimeter()) {
std::vector<ExtrusionLine> copy(extrusions[e].second - extrusions[e].first); std::vector<ExtrusionLine> copy(extrusions[e].second - extrusions[e].first);
for (size_t ex_line_idx = extrusions[e].first; ex_line_idx < extrusions[e].second; ++ex_line_idx) { for (size_t ex_line_idx = extrusions[e].first; ex_line_idx < extrusions[e].second; ++ex_line_idx) {
copy[ex_line_idx - extrusions[e].first] = layer_lines[ex_line_idx]; copy[ex_line_idx - extrusions[e].first] = layer_lines[ex_line_idx];
@ -478,8 +489,8 @@ std::tuple<LayerIslands, PixelGrid> reckon_islands(
island_extrusions.push_back( { e }); island_extrusions.push_back( { e });
} }
} }
// backup code if islands not found - this can currently happen, as external perimeters may be also pure overhang perimeters, and there is no
// way to distinguish external extrusions with total certainty. // backup code if islands not found
// If that happens, just make the first extrusion into island - it may be wrong, but it won't crash. // If that happens, just make the first extrusion into island - it may be wrong, but it won't crash.
if (islands.empty() && !extrusions.empty()) { if (islands.empty() && !extrusions.empty()) {
std::vector<ExtrusionLine> copy(extrusions[0].second - extrusions[0].first); std::vector<ExtrusionLine> copy(extrusions[0].second - extrusions[0].first);
@ -492,9 +503,13 @@ std::tuple<LayerIslands, PixelGrid> reckon_islands(
// assign non external extrusions to islands // assign non external extrusions to islands
for (size_t e = 0; e < extrusions.size(); ++e) { for (size_t e = 0; e < extrusions.size(); ++e) {
if (!layer_lines[extrusions[e].first].is_external_perimeter()) { if (!layer_lines[extrusions[e].first].origin_entity->is_loop() ||
!layer_lines[extrusions[e].first].is_external_perimeter()) {
bool island_assigned = false; bool island_assigned = false;
for (size_t i = 0; i < islands.size(); ++i) { for (size_t i = 0; i < islands.size(); ++i) {
if (island_extrusions[i].empty()) {
continue;
}
size_t _idx = 0; size_t _idx = 0;
Vec2f _pt = Vec2f::Zero(); Vec2f _pt = Vec2f::Zero();
if (islands[i].signed_distance_from_lines(layer_lines[extrusions[e].first].a, _idx, _pt) < 0) { if (islands[i].signed_distance_from_lines(layer_lines[extrusions[e].first].a, _idx, _pt) < 0) {
@ -509,24 +524,6 @@ std::tuple<LayerIslands, PixelGrid> reckon_islands(
} }
} }
} }
// merge islands which are embedded within each other (mainly holes)
for (size_t i = 0; i < islands.size(); ++i) {
if (islands[i].get_lines().empty()) {
continue;
}
for (size_t j = 0; j < islands.size(); ++j) {
if (islands[j].get_lines().empty() || i == j) {
continue;
}
size_t _idx;
Vec2f _pt;
if (islands[i].signed_distance_from_lines(islands[j].get_line(0).a, _idx, _pt) < 0) {
island_extrusions[i].insert(island_extrusions[i].end(), island_extrusions[j].begin(),
island_extrusions[j].end());
island_extrusions[j].clear();
}
}
}
float flow_width = get_flow_width(layer->regions()[0], erExternalPerimeter); float flow_width = get_flow_width(layer->regions()[0], erExternalPerimeter);
// after filtering the layer lines into islands, build the result LayerIslands structure. // after filtering the layer lines into islands, build the result LayerIslands structure.
@ -559,7 +556,8 @@ std::tuple<LayerIslands, PixelGrid> reckon_islands(
// Bottom infill lines can be quite long, and algined, so the middle approximaton used above does not work // Bottom infill lines can be quite long, and algined, so the middle approximaton used above does not work
Vec2f dir = (line.b - line.a).normalized(); Vec2f dir = (line.b - line.a).normalized();
float segment_length = flow_width; // segments of size flow_width float segment_length = flow_width; // segments of size flow_width
for (float segment_middle_dist = std::min(line.len, segment_length * 0.5f); segment_middle_dist < line.len; for (float segment_middle_dist = std::min(line.len, segment_length * 0.5f);
segment_middle_dist < line.len;
segment_middle_dist += segment_length) { segment_middle_dist += segment_length) {
Vec2f segment_middle = line.a + segment_middle_dist * dir; Vec2f segment_middle = line.a + segment_middle_dist * dir;
island.sticking_second_moment_of_area_accumulator += segment_length * flow_width island.sticking_second_moment_of_area_accumulator += segment_length * flow_width
@ -723,7 +721,8 @@ public:
} }
Vec3f centroid = centroid_accumulator / area; Vec3f centroid = centroid_accumulator / area;
float extreme_fiber_dist = line_alg::distance_to( float extreme_fiber_dist = line_alg::distance_to(
Linef(centroid.head<2>().cast<double>(), (centroid.head<2>() + Vec2f(line_dir.y(), -line_dir.x())).cast<double>()), Linef(centroid.head<2>().cast<double>(),
(centroid.head<2>() + Vec2f(line_dir.y(), -line_dir.x())).cast<double>()),
extreme_point.head<2>().cast<double>()); extreme_point.head<2>().cast<double>());
float elastic_section_modulus = area * directional_xy_variance / extreme_fiber_dist; float elastic_section_modulus = area * directional_xy_variance / extreme_fiber_dist;
@ -771,7 +770,8 @@ public:
Vec2f bed_weight_arm = (mass_centroid.head<2>() - bed_centroid.head<2>()); Vec2f bed_weight_arm = (mass_centroid.head<2>() - bed_centroid.head<2>());
float bed_weight_arm_len = bed_weight_arm.norm(); float bed_weight_arm_len = bed_weight_arm.norm();
float bed_weight_dir_xy_variance = compute_directional_xy_variance(bed_weight_arm, this->sticking_centroid_accumulator, float bed_weight_dir_xy_variance = compute_directional_xy_variance(bed_weight_arm,
this->sticking_centroid_accumulator,
this->sticking_second_moment_of_area_accumulator, this->sticking_second_moment_of_area_accumulator,
this->sticking_second_moment_of_area_covariance_accumulator, this->sticking_second_moment_of_area_covariance_accumulator,
this->sticking_area); this->sticking_area);
@ -1019,6 +1019,13 @@ Issues check_global_stability(SupportGridFilter supports_presence_grid,
for (size_t island_idx = 0; island_idx < islands_graph[layer_idx].islands.size(); ++island_idx) { for (size_t island_idx = 0; island_idx < islands_graph[layer_idx].islands.size(); ++island_idx) {
const Island &island = islands_graph[layer_idx].islands[island_idx]; const Island &island = islands_graph[layer_idx].islands[island_idx];
ObjectPart &part = active_object_parts.access(prev_island_to_object_part_mapping[island_idx]); ObjectPart &part = active_object_parts.access(prev_island_to_object_part_mapping[island_idx]);
//skip small drops of material - if they grow in size, they will be supported in next layers;
// if they dont grow, they are not worthy
if (part.get_volume() < params.supportable_volume_threshold) {
continue;
}
IslandConnection &weakest_conn = prev_island_weakest_connection[island_idx]; IslandConnection &weakest_conn = prev_island_weakest_connection[island_idx];
#ifdef DETAILED_DEBUG_LOGS #ifdef DETAILED_DEBUG_LOGS
weakest_conn.print_info("weakest connection info: "); weakest_conn.print_info("weakest connection info: ");
@ -1132,7 +1139,7 @@ std::tuple<Issues, std::vector<LayerIslands>> check_extrusions_and_build_graph(c
} }
for (const auto &line : layer_lines) { for (const auto &line : layer_lines) {
if (line.malformation > 0.0f) { if (line.malformation > 0.0f) {
Vec3f color = value_to_rgbf(0, 1.0f, line.malformation); Vec3f color = value_to_rgbf(-EPSILON, 1.0f, line.malformation);
fprintf(malform_f, "v %f %f %f %f %f %f\n", line.b[0], fprintf(malform_f, "v %f %f %f %f %f %f\n", line.b[0],
line.b[1], layer->slice_z, color[0], color[1], color[2]); line.b[1], layer->slice_z, color[0], color[1], color[2]);
} }

7
src/libslic3r/SupportSpotsGenerator.hpp
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@ -24,14 +24,17 @@ struct Params {
} }
// the algorithm should use the following units for all computations: distance [mm], mass [g], time [s], force [g*mm/s^2] // the algorithm should use the following units for all computations: distance [mm], mass [g], time [s], force [g*mm/s^2]
const float bridge_distance = 15.0f; //mm const float bridge_distance = 12.0f; //mm
const float bridge_distance_decrease_by_curvature_factor = 5.0f; // allowed bridge distance = bridge_distance / (this factor * (curvature / PI) ) const float bridge_distance_decrease_by_curvature_factor = 5.0f; // allowed bridge distance = bridge_distance / (1 + this factor * (curvature / PI) )
const float overhang_angle_deg = 80.0f; const float overhang_angle_deg = 80.0f;
const std::pair<float,float> malformation_angle_span_deg = std::pair<float, float> { 45.0f, 80.0f }; const std::pair<float,float> malformation_angle_span_deg = std::pair<float, float> { 45.0f, 80.0f };
const float min_distance_between_support_points = 3.0f; //mm const float min_distance_between_support_points = 3.0f; //mm
const float support_points_interface_radius = 1.5f; // mm const float support_points_interface_radius = 1.5f; // mm
// NOTE: Currently disabled, does not work correctly due to inability of the algorithm to correctly detect islands at each layer
const float supportable_volume_threshold = 0.0f; // mm^3
std::string filament_type; std::string filament_type;
const float gravity_constant = 9806.65f; // mm/s^2; gravity acceleration on Earth's surface, algorithm assumes that printer is in upwards position. const float gravity_constant = 9806.65f; // mm/s^2; gravity acceleration on Earth's surface, algorithm assumes that printer is in upwards position.
const float max_acceleration = 9 * 1000.0f; // mm/s^2 ; max acceleration of object (bed) in XY (NOTE: The max hit is received by the object in the jerk phase, so the usual machine limits are too low) const float max_acceleration = 9 * 1000.0f; // mm/s^2 ; max acceleration of object (bed) in XY (NOTE: The max hit is received by the object in the jerk phase, so the usual machine limits are too low)