Enable three nodes branch on gridded part

src/gridmeshbuilder.cpp

@@ -421,14 +421,17 @@ void GridMeshBuilder::setSubdived(bool subdived)
     m_subdived = subdived;
 }
 
-void GridMeshBuilder::build()
+bool GridMeshBuilder::build()
 {
     if (m_subdived)
         applyModifiers();
     prepareNodeVertices();
     findCycles();
+    if (m_cycles.empty())
+        return false;
     generateFaces();
     extrude();
+    return true;
 }
 
 void GridMeshBuilder::findCycles()
@@ -442,3 +445,4 @@ void GridMeshBuilder::findCycles()
     cycleFinder.find();
     m_cycles = cycleFinder.getCycles();
 }
+

src/gridmeshbuilder.h

@@ -25,7 +25,7 @@ public:
     size_t addNode(const QVector3D &position, float radius);
     size_t addEdge(size_t firstNodeIndex, size_t secondNodeIndex);
     void setSubdived(bool subdived);
-    void build();
+    bool build();
     const std::vector<QVector3D> &getGeneratedPositions();
     const std::vector<size_t> &getGeneratedSources();
     const std::vector<std::vector<size_t>> &getGeneratedFaces();

src/meshgenerator.cpp

@@ -580,8 +580,7 @@ MeshCombiner::Mesh *MeshGenerator::combinePartMesh(const QString &partIdString,
         
         if (subdived)
             gridMeshBuilder->setSubdived(true);
-        gridMeshBuilder->build();
-        buildSucceed = true;
+        buildSucceed = gridMeshBuilder->build();
         
         partCache.vertices = gridMeshBuilder->getGeneratedPositions();
         partCache.faces = gridMeshBuilder->getGeneratedFaces();

src/skeletondocument.cpp

@@ -73,5 +73,13 @@ void SkeletonDocument::findAllNeighbors(QUuid nodeId, std::set<QUuid> &neighbors
 
 bool SkeletonDocument::isNodeConnectable(QUuid nodeId) const
 {
-    return true;
+    const auto &node = findNode(nodeId);
+    if (nullptr == node)
+        return false;
+    if (node->edgeIds.size() < 2)
+        return true;
+    const SkeletonPart *part = findPart(node->partId);
+    if (nullptr == part)
+        return false;
+    return part->gridded;
 }