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ENH: add vertical support enforcer 

Previously painting support enforces on vertical faces doesn't work, as projecting the facets downwards will give empty polygons.
Now we use a different mechanism to enable vertical paint-on enforces, by directly adding contact nodes.
Note: this feature only works with tree support as only tree support has contact nodes.

jira: none
Change-Id: Id171b1665566d142a6427285baccb40c0aa00949
(cherry picked from commit 9c882f61eb37350a4486df58de48f0ae489f2d15)
This commit is contained in:
Arthur 2024-03-21 16:43:45 +08:00 committed by Lane.Wei
parent 65cfb9ad13
commit 68625a6e60
8 changed files with 70 additions and 17 deletions
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4
src/libslic3r/MultiMaterialSegmentation.cpp
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@ -1363,7 +1363,7 @@ static inline std::vector<std::vector<ExPolygons>> mmu_segmentation_top_and_bott
if (!zs.empty() && is_volume_sinking(painted, volume_trafo)) {
std::vector<float> zs_sinking = {0.f};
Slic3r::append(zs_sinking, zs);
slice_mesh_slabs(painted, zs_sinking, volume_trafo, max_top_layers > 0 ? &top : nullptr, max_bottom_layers > 0 ? &bottom : nullptr, throw_on_cancel_callback);
slice_mesh_slabs(painted, zs_sinking, volume_trafo, max_top_layers > 0 ? &top : nullptr, max_bottom_layers > 0 ? &bottom : nullptr, nullptr, throw_on_cancel_callback);
if (top.size() > 0)
top.erase(top.begin());
@ -1377,7 +1377,7 @@ static inline std::vector<std::vector<ExPolygons>> mmu_segmentation_top_and_bott
bottom[0] = union_(bottom[0], bottom_slice);
}
} else
slice_mesh_slabs(painted, zs, volume_trafo, max_top_layers > 0 ? &top : nullptr, max_bottom_layers > 0 ? &bottom : nullptr, throw_on_cancel_callback);
slice_mesh_slabs(painted, zs, volume_trafo, max_top_layers > 0 ? &top : nullptr, max_bottom_layers > 0 ? &bottom : nullptr, nullptr, throw_on_cancel_callback);
auto merge = [](std::vector<Polygons> &&src, std::vector<Polygons> &dst) {
auto it_src = find_if(src.begin(), src.end(), [](const Polygons &p){ return ! p.empty(); });
if (it_src != src.end()) {

2
src/libslic3r/Print.hpp
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@ -429,7 +429,7 @@ public:
std::vector<Polygons> slice_support_enforcers() const { return this->slice_support_volumes(ModelVolumeType::SUPPORT_ENFORCER); }
// Helpers to project custom facets on slices
void project_and_append_custom_facets(bool seam, EnforcerBlockerType type, std::vector<Polygons>& expolys) const;
void project_and_append_custom_facets(bool seam, EnforcerBlockerType type, std::vector<Polygons>& expolys, std::vector<std::pair<Vec3f,Vec3f>>* vertical_points=nullptr) const;
//BBS
BoundingBox get_first_layer_bbox(float& area, float& layer_height, std::string& name);

4
src/libslic3r/PrintObject.cpp
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@ -3820,7 +3820,7 @@ static void project_triangles_to_slabs(ConstLayerPtrsAdaptor layers, const index
}
void PrintObject::project_and_append_custom_facets(
bool seam, EnforcerBlockerType type, std::vector<Polygons>& out) const
bool seam, EnforcerBlockerType type, std::vector<Polygons>& out, std::vector<std::pair<Vec3f, Vec3f>>* vertical_points) const
{
for (const ModelVolume* mv : this->model_object()->volumes)
if (mv->is_model_part()) {
@ -3835,7 +3835,7 @@ void PrintObject::project_and_append_custom_facets(
else {
std::vector<Polygons> projected;
// Support blockers or enforcers. Project downward facing painted areas upwards to their respective slicing plane.
slice_mesh_slabs(custom_facets, zs_from_layers(this->layers()), this->trafo_centered() * mv->get_matrix(), nullptr, &projected, [](){});
slice_mesh_slabs(custom_facets, zs_from_layers(this->layers()), this->trafo_centered() * mv->get_matrix(), nullptr, &projected, vertical_points, [](){});
// Merge these projections with the output, layer by layer.
assert(! projected.empty());
assert(out.empty() || out.size() == projected.size());

40
src/libslic3r/Support/TreeSupport.cpp
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@ -976,7 +976,8 @@ void TreeSupport::detect_overhangs(bool check_support_necessity/* = false*/)
auto enforcers = m_object->slice_support_enforcers();
auto blockers = m_object->slice_support_blockers();
m_object->project_and_append_custom_facets(false, EnforcerBlockerType::ENFORCER, enforcers);
m_vertical_enforcer_points.clear();
m_object->project_and_append_custom_facets(false, EnforcerBlockerType::ENFORCER, enforcers, &m_vertical_enforcer_points);
m_object->project_and_append_custom_facets(false, EnforcerBlockerType::BLOCKER, blockers);
if (is_auto(stype) && config_remove_small_overhangs) {
@ -2890,12 +2891,17 @@ void TreeSupport::drop_nodes()
movement = move_to_neighbor_center; // otherwise move to neighbor center first
}
if (vsize2_with_unscale(movement) > get_max_move_dist(&node,2))
movement = normal(movement, scale_(get_max_move_dist(&node)));
if (node.is_sharp_tail && node.dist_mm_to_top < 3) {
movement = normal(node.skin_direction, scale_(get_max_move_dist(&node)));
}
else if (dist2_to_outer > 0)
movement = normal(direction_to_outer, scale_(get_max_move_dist(&node)));
else
movement = normal(move_to_neighbor_center, scale_(get_max_move_dist(&node)));
next_layer_vertex += movement;
if (group_index == 0) {
if (group_index == 0 && 0) {
// Avoid collisions.
const coordf_t max_move_between_samples = get_max_move_dist(&node, 1) + radius_sample_resolution + EPSILON; // 100 micron extra for rounding errors.
bool is_outside = move_out_expolys(avoidance_next, next_layer_vertex, radius_sample_resolution + EPSILON, max_move_between_samples);
@ -3363,6 +3369,21 @@ void TreeSupport::generate_contact_points()
tbb::spin_mutex mtx;
// add vertical enforcer points
std::vector<float> zs = zs_from_layers(m_object->layers());
std::vector<std::vector<std::pair<Point,Point>>> vertical_enforcer_points_by_layers(m_object->layer_count());
for (auto& pt_and_normal : m_vertical_enforcer_points) {
auto pt = pt_and_normal.first;
auto normal = pt_and_normal.second; // normal seems useless
auto iter = std::lower_bound(zs.begin(), zs.end(), pt.z());
if (iter != zs.end()) {
size_t layer_nr = iter - zs.begin();
if (layer_nr > 0 && layer_nr < contact_nodes.size()) {
vertical_enforcer_points_by_layers[layer_nr].push_back({ to_2d(pt).cast<coord_t>(),scaled(to_2d(normal)) });
}
}
}
int nonempty_layers = 0;
tbb::concurrent_vector<Slic3r::Vec3f> all_nodes;
tbb::parallel_for(tbb::blocked_range<size_t>(1, m_object->layers().size()), [&](const tbb::blocked_range<size_t>& range) {
@ -3371,7 +3392,6 @@ void TreeSupport::generate_contact_points()
break;
Layer* layer = m_object->get_layer(layer_nr);
auto& curr_nodes = contact_nodes[layer_nr-1];
if (layer->loverhangs.empty()) continue;
std::unordered_set<Point, PointHash> already_inserted;
auto bottom_z = m_object->get_layer(layer_nr)->bottom_z();
@ -3472,6 +3492,13 @@ void TreeSupport::generate_contact_points()
}
}
}
for (auto& pt_and_normal : vertical_enforcer_points_by_layers[layer_nr]) {
is_sharp_tail = true;// fake it as sharp tail point so the contact distance will be 0
auto vertical_enforcer_point= pt_and_normal.first;
auto node=insert_point(vertical_enforcer_point, ExPolygon(), false);
if (node)
node->skin_direction = pt_and_normal.second;
}
if (!curr_nodes.empty()) nonempty_layers++;
for (auto node : curr_nodes) { all_nodes.emplace_back(node->position(0), node->position(1), scale_(node->print_z)); }
#ifdef SUPPORT_TREE_DEBUG_TO_SVG
@ -3480,6 +3507,9 @@ void TreeSupport::generate_contact_points()
#endif
}}
); // end tbb::parallel_for
int nNodes = all_nodes.size();
avg_node_per_layer = nodes_angle = 0;
if (nNodes > 0) {

3
src/libslic3r/Support/TreeSupport.hpp
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@ -414,6 +414,8 @@ public:
enum OverhangType { Detected = 0, Enforced, SharpTail };
std::map<const ExPolygon*, OverhangType> overhang_types;
std::vector<std::pair<Vec3f, Vec3f>> m_vertical_enforcer_points;
private:
/*!
* \brief Generator for model collision, avoidance and internal guide volumes
@ -433,7 +435,6 @@ private:
size_t m_highest_overhang_layer = 0;
std::vector<std::vector<MinimumSpanningTree>> m_spanning_trees;
std::vector< std::unordered_map<Line, bool, LineHash>> m_mst_line_x_layer_contour_caches;
float DO_NOT_MOVER_UNDER_MM = 0.0;
coordf_t base_radius = 0.0;
const coordf_t MAX_BRANCH_RADIUS = 10.0;

16
src/libslic3r/Support/TreeSupport3D.cpp
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@ -4178,6 +4178,22 @@ static void generate_support_areas(Print &print, TreeSupport* tree_support, cons
append(overhangs[i + num_raft_layers], polys);
}
}
// add vertical enforcer points
std::vector<float> zs = zs_from_layers(print_object.layers());
Polygon base_circle = make_circle(scale_(0.5), SUPPORT_TREE_CIRCLE_RESOLUTION);
for (auto &pt_and_normal :tree_support->m_vertical_enforcer_points) {
auto pt = pt_and_normal.first;
auto normal = pt_and_normal.second; // normal seems useless
auto iter = std::lower_bound(zs.begin(), zs.end(), pt.z());
if (iter != zs.end()) {
size_t layer_nr = iter - zs.begin();
if (layer_nr > 0 && layer_nr < print_object.layer_count()) {
Polygon circle = base_circle;
circle.translate(to_2d(pt).cast<coord_t>());
overhangs[layer_nr + num_raft_layers].emplace_back(std::move(circle));
}
}
}
#else
std::vector<Polygons> overhangs = generate_overhangs(config, *print.get_object(processing.second.front()), throw_on_cancel);
#endif

11
src/libslic3r/TriangleMeshSlicer.cpp
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@ -957,7 +957,6 @@ inline std::pair<SlabLines, SlabLines> slice_slabs_make_lines(
}
slice_facet_with_slabs<true>(vertices, indices, face_idx, neighbors, edge_ids, num_edges, zs, lines_top, lines_mutex_top);
}
// BBS: add vertical faces option
if (bottom && (fo == FaceOrientation::Down || fo == FaceOrientation::Degenerate)) {
Vec3i neighbors = face_neighbors[face_idx];
// Reset neighborship of this triangle in case the other triangle is oriented backwards from this one.
@ -2063,6 +2062,7 @@ void slice_mesh_slabs(
const Transform3d &trafo,
std::vector<Polygons> *out_top,
std::vector<Polygons> *out_bottom,
std::vector<std::pair<Vec3f, Vec3f>> *vertical_points,
std::function<void()> throw_on_cancel)
{
BOOST_LOG_TRIVIAL(debug) << "slice_mesh_slabs to polygons";
@ -2133,6 +2133,11 @@ void slice_mesh_slabs(
// Is the triangle vertical or degenerate?
assert(d == 0);
fo = fa == fb || fa == fc || fb == fc ? FaceOrientation::Degenerate : FaceOrientation::Vertical;
if(vertical_points && fo==FaceOrientation::Vertical)
{
Vec3f normal = (fb - fa).cross(fc - fa).normalized();
vertical_points->push_back({ (fa + fb + fc) / 3,normal });
}
}
face_orientation[&tri - mesh.indices.data()] = fo;
}
@ -2297,7 +2302,7 @@ void project_mesh(
{
std::vector<Polygons> top, bottom;
std::vector<float> zs { -1e10, 1e10 };
slice_mesh_slabs(mesh, zs, trafo, out_top ? &top : nullptr, out_bottom ? &bottom : nullptr, throw_on_cancel);
slice_mesh_slabs(mesh, zs, trafo, out_top ? &top : nullptr, out_bottom ? &bottom : nullptr, nullptr, throw_on_cancel);
if (out_top)
*out_top = std::move(top.front());
if (out_bottom)
@ -2311,7 +2316,7 @@ Polygons project_mesh(
{
std::vector<Polygons> top, bottom;
std::vector<float> zs { -1e10, 1e10 };
slice_mesh_slabs(mesh, zs, trafo, &top, &bottom, throw_on_cancel);
slice_mesh_slabs(mesh, zs, trafo, &top, &bottom, nullptr, throw_on_cancel);
return union_(top.front(), bottom.back());
}

1
src/libslic3r/TriangleMeshSlicer.hpp
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@ -107,6 +107,7 @@ void slice_mesh_slabs(
const Transform3d &trafo,
std::vector<Polygons> *out_top,
std::vector<Polygons> *out_bottom,
std::vector<std::pair<Vec3f, Vec3f>> *vertical_points,
std::function<void()> throw_on_cancel);
// Project mesh upwards pointing surfaces / downwards pointing surfaces into 2D polygons.