Fix failing sla tree tests

Try to increase number of rays in Beam to prevent colisions


Put back threshold for intersections with model in sla tree tests 


Increase safety distance for branching tree instead of increasing rays

src/libslic3r/SLA/BranchingTreeSLA.cpp

@@ -120,7 +120,7 @@ bool BranchingTreeBuilder::add_bridge(const branchingtree::Node &from,
     double fromR = get_radius(from), toR = get_radius(to);
     Beam beam{Ball{fromd, fromR}, Ball{tod, toR}};
     auto   hit = beam_mesh_hit(ex_tbb, m_sm.emesh, beam,
-                               m_sm.cfg.safety_distance_mm);
+                               2 * m_sm.cfg.safety_distance_mm);
 
     bool ret = hit.distance() > (tod - fromd).norm();
 
@@ -140,7 +140,8 @@ bool BranchingTreeBuilder::add_merger(const branchingtree::Node &node,
     double closestR = get_radius(closest);
     Beam beam1{Ball{from1d, nodeR}, Ball{tod, mergeR}};
     Beam beam2{Ball{from2d, closestR}, Ball{tod, mergeR}};
-    auto sd = m_sm.cfg.safety_distance_mm;
+
+    auto sd = 2 * m_sm.cfg.safety_distance_mm;
     auto hit1 = beam_mesh_hit(ex_tbb, m_sm.emesh, beam1, sd);
     auto hit2 = beam_mesh_hit(ex_tbb, m_sm.emesh, beam2, sd);
 
@@ -166,7 +167,7 @@ bool BranchingTreeBuilder::add_ground_bridge(const branchingtree::Node &from,
 }
 
 bool BranchingTreeBuilder::add_mesh_bridge(const branchingtree::Node &from,
-                                       const branchingtree::Node &to)
+                                           const branchingtree::Node &to)
 {
     sla::Junction fromj = {from.pos.cast<double>(), get_radius(from)};
 
@@ -178,7 +179,9 @@ bool BranchingTreeBuilder::add_mesh_bridge(const branchingtree::Node &from,
         m_builder.add_diffbridge(fromj.pos, anchor->junction_point(), fromj.r,
                                  anchor->r_back_mm);
 
-        m_builder.add_anchor(*anchor);
+        if (!m_sm.cfg.ground_facing_only) { // Easter egg, to omit the anchors
+            m_builder.add_anchor(*anchor);
+        }
 
         build_subtree(from.id);
     }

src/libslic3r/SLAPrint.cpp

@@ -57,7 +57,11 @@ sla::SupportTreeConfig make_support_cfg(const SLAPrintObjectConfig& c)
     scfg.max_bridge_length_mm = c.support_max_bridge_length.getFloat();
     scfg.max_pillar_link_distance_mm = c.support_max_pillar_link_distance.getFloat();
     scfg.pillar_connection_mode = c.support_pillar_connection_mode.value;
-    scfg.ground_facing_only = c.support_buildplate_only.getBool();
+    if (scfg.tree_type != sla::SupportTreeType::Branching) {
+        // Branching tree is all about routing to model body, it doesn't support
+        // this option.
+        scfg.ground_facing_only = c.support_buildplate_only.getBool();
+    }
     scfg.pillar_widening_factor = c.support_pillar_widening_factor.getFloat();
     scfg.base_radius_mm = 0.5*c.support_base_diameter.getFloat();
     scfg.base_height_mm = c.support_base_height.getFloat();

tests/sla_print/sla_test_utils.cpp

@@ -6,54 +6,58 @@
 
 #include <iomanip>
 
-void test_support_model_collision(const std::string          &obj_filename,
-                                  const sla::SupportTreeConfig   &input_supportcfg,
-                                  const sla::HollowingConfig &hollowingcfg,
-                                  const sla::DrainHoles      &drainholes)
+void test_support_model_collision(
+    const std::string            &obj_filename,
+    const sla::SupportTreeConfig &input_supportcfg,
+    const sla::HollowingConfig   &hollowingcfg,
+    const sla::DrainHoles        &drainholes)
 {
     SupportByproducts byproducts;
-    
+
     sla::SupportTreeConfig supportcfg = input_supportcfg;
-    
+
+    // Ensure that there are no anchors which would pierce the model.
+    supportcfg.ground_facing_only = true;
+
     // Set head penetration to a small negative value which should ensure that
     // the supports will not touch the model body.
     supportcfg.head_penetration_mm = -0.2;
-    
+
     test_supports(obj_filename, supportcfg, hollowingcfg, drainholes, byproducts);
-    
+
     // Slice the support mesh given the slice grid of the model.
     std::vector<ExPolygons> support_slices =
-        sla::slice(byproducts.supporttree.retrieve_mesh(sla::MeshType::Support),
-              byproducts.supporttree.retrieve_mesh(sla::MeshType::Pad),
+        sla::slice(byproducts.suptree_builder.retrieve_mesh(sla::MeshType::Support),
+              byproducts.suptree_builder.retrieve_mesh(sla::MeshType::Pad),
               byproducts.slicegrid, CLOSING_RADIUS, {});
 
     // The slices originate from the same slice grid so the numbers must match
-    
+
     bool support_mesh_is_empty =
-            byproducts.supporttree.retrieve_mesh(sla::MeshType::Pad).empty() &&
-            byproducts.supporttree.retrieve_mesh(sla::MeshType::Support).empty();
-    
+            byproducts.suptree_builder.retrieve_mesh(sla::MeshType::Pad).empty() &&
+            byproducts.suptree_builder.retrieve_mesh(sla::MeshType::Support).empty();
+
     if (support_mesh_is_empty)
         REQUIRE(support_slices.empty());
     else
         REQUIRE(support_slices.size() == byproducts.model_slices.size());
-    
+
     bool notouch = true;
     for (size_t n = 0; notouch && n < support_slices.size(); ++n) {
         const ExPolygons &sup_slice = support_slices[n];
         const ExPolygons &mod_slice = byproducts.model_slices[n];
-        
+
         Polygons intersections = intersection(sup_slice, mod_slice);
-        
+
         double pinhead_r  = scaled(input_supportcfg.head_front_radius_mm);
 
         // TODO:: make it strict without a threshold of PI * pihead_radius ^ 2
         notouch = notouch && area(intersections) < PI * pinhead_r * pinhead_r;
     }
-    
+
     if (!notouch)
         export_failed_case(support_slices, byproducts);
-    
+
     REQUIRE(notouch);
 }
 
@@ -80,7 +84,7 @@ void export_failed_case(const std::vector<ExPolygons> &support_slices, const Sup
 
     if (do_export_stl) {
         indexed_triangle_set its;
-        byproducts.supporttree.retrieve_full_mesh(its);
+        byproducts.suptree_builder.retrieve_full_mesh(its);
         TriangleMesh m{its};
         m.merge(byproducts.input_mesh);
         m.WriteOBJFile((Catch::getResultCapture().getCurrentTestName() + "_" +
@@ -96,49 +100,49 @@ void test_supports(const std::string          &obj_filename,
 {
     using namespace Slic3r;
     TriangleMesh mesh = load_model(obj_filename);
-    
+
     REQUIRE_FALSE(mesh.empty());
-    
+
     if (hollowingcfg.enabled) {
         sla::InteriorPtr interior = sla::generate_interior(mesh, hollowingcfg);
         REQUIRE(interior);
         mesh.merge(TriangleMesh{sla::get_mesh(*interior)});
     }
-    
+
     auto   bb      = mesh.bounding_box();
     double zmin    = bb.min.z();
     double zmax    = bb.max.z();
     double gnd     = zmin - supportcfg.object_elevation_mm;
     auto   layer_h = 0.05f;
-    
+
     out.slicegrid = grid(float(gnd), float(zmax), layer_h);
     out.model_slices = slice_mesh_ex(mesh.its, out.slicegrid, CLOSING_RADIUS);
     sla::cut_drainholes(out.model_slices, out.slicegrid, CLOSING_RADIUS, drainholes, []{});
-    
+
     // Create the special index-triangle mesh with spatial indexing which
     // is the input of the support point and support mesh generators
     AABBMesh emesh{mesh};
 
-#ifdef SLIC3R_HOLE_RAYCASTER
-    if (hollowingcfg.enabled) 
+    #ifdef SLIC3R_HOLE_RAYCASTER
+    if (hollowingcfg.enabled)
         emesh.load_holes(drainholes);
-#endif
+    #endif
 
     // TODO: do the cgal hole cutting...
-    
+
     // Create the support point generator
     sla::SupportPointGenerator::Config autogencfg;
     autogencfg.head_diameter = float(2 * supportcfg.head_front_radius_mm);
     sla::SupportPointGenerator point_gen{emesh, autogencfg, [] {}, [](int) {}};
-    
+
     point_gen.seed(0); // Make the test repeatable
     point_gen.execute(out.model_slices, out.slicegrid);
-    
+
     // Get the calculated support points.
     std::vector<sla::SupportPoint> support_points = point_gen.output();
-    
+
     int validityflags = ASSUME_NO_REPAIR;
-    
+
     // If there is no elevation, support points shall be removed from the
     // bottom of the object.
     if (std::abs(supportcfg.object_elevation_mm) < EPSILON) {
@@ -146,11 +150,11 @@ void test_supports(const std::string          &obj_filename,
     } else {
         // Should be support points at least on the bottom of the model
         REQUIRE_FALSE(support_points.empty());
-        
+
         // Also the support mesh should not be empty.
         validityflags |= ASSUME_NO_EMPTY;
     }
-    
+
     // Generate the actual support tree
     sla::SupportTreeBuilder treebuilder;
     sla::SupportableMesh    sm{emesh, support_points, supportcfg};
@@ -170,25 +174,25 @@ void test_supports(const std::string          &obj_filename,
     }
 
     TriangleMesh output_mesh{treebuilder.retrieve_mesh(sla::MeshType::Support)};
-    
+
     check_validity(output_mesh, validityflags);
-    
+
     // Quick check if the dimensions and placement of supports are correct
     auto obb = output_mesh.bounding_box();
-    
+
     double allowed_zmin = zmin - supportcfg.object_elevation_mm;
-    
+
     if (std::abs(supportcfg.object_elevation_mm) < EPSILON)
         allowed_zmin = zmin - 2 * supportcfg.head_back_radius_mm;
-    
+
     REQUIRE(obb.min.z() >= Approx(allowed_zmin));
     REQUIRE(obb.max.z() <= Approx(zmax));
-    
+
     // Move out the support tree into the byproducts, we can examine it further
     // in various tests.
-    out.obj_fname   = std::move(obj_filename);
-    out.supporttree = std::move(treebuilder);
-    out.input_mesh  = std::move(mesh);
+    out.obj_fname       = std::move(obj_filename);
+    out.suptree_builder = std::move(treebuilder);
+    out.input_mesh      = std::move(mesh);
 }
 
 void check_support_tree_integrity(const sla::SupportTreeBuilder &stree, 

tests/sla_print/sla_test_utils.hpp

@@ -60,7 +60,7 @@ struct SupportByproducts
     std::string             obj_fname;
     std::vector<float>      slicegrid;
     std::vector<ExPolygons> model_slices;
-    sla::SupportTreeBuilder supporttree;
+    sla::SupportTreeBuilder suptree_builder;
     TriangleMesh            input_mesh;
 };