“…It is based on Blender ( Blender Foundation ), a free, open-source software suite for 3D modeling, animation , texture mapping , compositing , rendering , and video editing [ 33 , 38 ]. Computational deformation methods for simulation of soft tissue surgical outcomes on a face mesh described in the literature include the mass spring model [ 28 , 30 ], Tetrahedral Mass Tensor Model (non-rigid TPS-RPM) [ 32 ], Tetrahedral Mass Spring Model [ 31 ], Mass Tensor Model [ 40 ], finite element model (FEM) [ 27 ], and FEM with slide effects [ 17 , 34 ]. OOB uses the well-established mass spring system mathematical deformation method, which employs a surface-based calculation system as its soft-body deformation model [ 33 ].…”