Eradicated admesh from TriangleMesh:

TriangleMesh newly only holds indexed_triangle_set and
TriangleMeshStats. TriangleMeshStats contains an excerpt of stl_stats.
TriangleMeshStats are updated when initializing with indexed_triangle_set.

Admesh triangle mesh fixing is newly only used when loading an STL.
AMF / 3MF / OBJ file formats are already indexed triangle sets, thus
they are no more converted to admesh stl_file format, nor fixed
through admesh repair machinery. When importing AMF / 3MF / OBJ files,
volume is calculated and if negative, all faces are flipped. Also
a bounding box and number of open edges is calculated.

Implemented its_number_of_patches(), its_num_open_edges()
Optimized its_split(), its_is_splittable() using a visitor pattern.

Reworked QHull integration into TriangleMesh:
    1) Face normals were not right.
    2) Indexed triangle set is newly emitted instead of duplicating
       vertices for each face.

Fixed cut_mesh(): Orient the triangulated faces correctly.

4 files changed, 3 insertions, 13 deletions

diff --git a/sandboxes/aabb-evaluation/aabb-evaluation.cpp b/sandboxes/aabb-evaluation/aabb-evaluation.cpp
index 9ec7451e5..1019ecf28 100644
--- a/sandboxes/aabb-evaluation/aabb-evaluation.cpp
+++ b/sandboxes/aabb-evaluation/aabb-evaluation.cpp
@@ -212,8 +212,7 @@ int main(const int argc, const char *argv[])
         return -1;
     }
 
-    mesh.repair();
-    if (mesh.facets_count() == 0) {
+    if (mesh.empty()) {
         std::cerr << "Error loading " << argv[1] << " . It is empty." << std::endl;
         return -1;
     }
diff --git a/sandboxes/meshboolean/MeshBoolean.cpp b/sandboxes/meshboolean/MeshBoolean.cpp
index 392d90707..c8649888f 100644
--- a/sandboxes/meshboolean/MeshBoolean.cpp
+++ b/sandboxes/meshboolean/MeshBoolean.cpp
@@ -24,7 +24,6 @@ int main(const int argc, const char * argv[])
     TriangleMesh input;
     
     input.ReadSTLFile(argv[1]);
-    input.repair();
     
     Benchmark bench;
     
diff --git a/sandboxes/opencsg/Engine.cpp b/sandboxes/opencsg/Engine.cpp
index 53e340294..d8f1d3464 100644
--- a/sandboxes/opencsg/Engine.cpp
+++ b/sandboxes/opencsg/Engine.cpp
@@ -409,7 +409,6 @@ void CSGDisplay::on_scene_updated(const Scene &scene)
             interior.transform(po->trafo().inverse());
             
             mshinst.merge(interior);
-            mshinst.require_shared_vertices();
             
             mi->transform_mesh(&mshinst);
             
@@ -417,14 +416,12 @@ void CSGDisplay::on_scene_updated(const Scene &scene)
             auto center = bb.center().cast<float>();
             mshinst.translate(-center);
             
-            mshinst.require_shared_vertices();
             m_scene_cache.add_mesh(mshinst, OpenCSG::Intersection,
                                    m_csgsettings.get_convexity());
         }
         
         for (const sla::DrainHole &holept : holedata) {
             TriangleMesh holemesh = sla::to_triangle_mesh(holept.to_mesh());
-            holemesh.require_shared_vertices();
             m_scene_cache.add_mesh(holemesh, OpenCSG::Subtraction, 1);
         }
     }
diff --git a/sandboxes/opencsg/ShaderCSGDisplay.cpp b/sandboxes/opencsg/ShaderCSGDisplay.cpp
index 8ceb234be..2413bad5b 100644
--- a/sandboxes/opencsg/ShaderCSGDisplay.cpp
+++ b/sandboxes/opencsg/ShaderCSGDisplay.cpp
@@ -43,7 +43,6 @@ void ShaderCSGDisplay::on_scene_updated(const Scene &scene)
             interior.transform(po->trafo().inverse());
             
             mshinst.merge(interior);
-            mshinst.require_shared_vertices();
             
             mi->transform_mesh(&mshinst);
             
@@ -51,15 +50,11 @@ void ShaderCSGDisplay::on_scene_updated(const Scene &scene)
             auto center = bb.center().cast<float>();
             mshinst.translate(-center);
             
-            mshinst.require_shared_vertices();
             add_mesh(mshinst);
         }
         
-        for (const sla::DrainHole &holept : holedata) {
-            TriangleMesh holemesh = sla::to_triangle_mesh(holept.to_mesh());
-            holemesh.require_shared_vertices();
-            add_mesh(holemesh);
-        }
+        for (const sla::DrainHole &holept : holedata)
+            add_mesh(sla::to_triangle_mesh(holept.to_mesh()));
     }
     
     repaint();