public ViewController()
 {
     _ifcEngine      = new IfcEngine();
     _treeData       = new CIFCTreeData(_ifcEngine);
     _meshToIfcItems = new Dictionary <MeshGeometryModel3D, IFCItem>();
     _minCorner      = new float[3] {
         float.MaxValue, float.MaxValue, float.MaxValue
     };
     _maxCorner = new float[3] {
         float.MinValue, float.MinValue, float.MinValue
     };
 }
 public ViewController()
 {
     _ifcEngine = new IfcEngine();
     _treeData = new CIFCTreeData(_ifcEngine);
     _meshToIfcItems = new Dictionary<MeshGeometryModel3D, IFCItem>();
     _minCorner = new float[3] { float.MaxValue, float.MaxValue, float.MaxValue };
     _maxCorner = new float[3] { float.MinValue, float.MinValue, float.MinValue };
 }