Fix for bad arrange with mirrored objects

src/libslic3r/ModelArrange.cpp

@@ -511,8 +511,9 @@ ShapeData2D projectModelFromTop(const Slic3r::Model &model) {
             ModelInstance * finst = objptr->instances.front();
 
             // Object instances should carry the same scaling and
-            // x, y rotation that is why we use the first instance
+            // x, y rotation that is why we use the first instance.
-            rmesh.scale(finst->get_scaling_factor());
+            // The next line will apply only the full mirroring and scaling
+            rmesh.transform(finst->get_matrix(true, true, false, false));
             rmesh.rotate_x(float(finst->get_rotation()(X)));
             rmesh.rotate_y(float(finst->get_rotation()(Y)));
 

src/libslic3r/SLA/SLASupportTree.cpp

@@ -1117,7 +1117,9 @@ bool SLASupportTree::generate(const PointSet &points,
                     head_norm.row(pcount) = nn;
 
                     ++pcount;
-                } else {
+                } else if( polar >= 3*PI/4 ) {
+                    // Headless supports do not tilt like the headed ones so
+                    // the normal should point almost to the ground.
                     headless_norm.row(hlcount) = nn;
                     headless_pos.row(hlcount++) = hp;
                 }

src/libslic3r/SLAPrint.cpp

@@ -502,8 +502,8 @@ void SLAPrint::process()
         po.m_supportdata.reset(new SLAPrintObject::SupportData());
         po.m_supportdata->emesh = sla::to_eigenmesh(po.transformed_mesh());
 
-        BOOST_LOG_TRIVIAL(debug)
+        BOOST_LOG_TRIVIAL(debug) << "Support point count "
-                << "Support point count " << mo.sla_support_points.size();
+                                 << mo.sla_support_points.size();
 
         // If there are no points on the front-end, we will do the
         // autoplacement. Otherwise we will just blindly copy the frontend data
@@ -537,6 +537,9 @@ void SLAPrint::process()
             const std::vector<Vec3d>& points = auto_supports.output();
             this->throw_if_canceled();
             po.m_supportdata->support_points = sla::to_point_set(points);
+
+            BOOST_LOG_TRIVIAL(debug) << "Automatic support points: "
+                                     << po.m_supportdata->support_points.rows();
         }
         else {
             // There are some points on the front-end, no calculation will be done.
@@ -584,13 +587,15 @@ void SLAPrint::process()
 
             // Create the unified mesh
             auto rc = SlicingStatus::RELOAD_SCENE;
-            po.m_supportdata->support_tree_ptr->merged_mesh();
 
-            // Check the mesh for later troubleshooting.
+            // This is to prevent "Done." being displayed during merged_mesh()
+            report_status(*this, -1, L("Visualizing supports"));
+            po.m_supportdata->support_tree_ptr->merged_mesh();
 
             BOOST_LOG_TRIVIAL(debug) << "Processed support point count "
                                      << po.m_supportdata->support_points.rows();
 
+            // Check the mesh for later troubleshooting.
             if(po.support_mesh().empty())
                 BOOST_LOG_TRIVIAL(warning) << "Support mesh is empty";