--- a/src/vertex.h	Thu Oct 03 11:45:44 2019 +0300
+++ b/src/vertex.h	Thu Oct 03 23:44:28 2019 +0300
@@ -54,6 +54,7 @@
 qreal distance(const Vertex& one, const Vertex& other);
 Vertex vertexFromVector(const QVector3D& vector);
 QVector3D vertexToVector(const Vertex &vertex);
+QString vertexToStringParens(const Vertex& vertex);
 unsigned int qHash(const Vertex& key);
 Vertex operator-(const Vertex& vertex);
 QDataStream& operator<<(QDataStream& out, const Vertex& vertex);