There are three common methods of 3D modeling: Polygonal modeling – It is based on vertices i.e., points in 3D space. These are connected by lines to form a 3D mesh and give a desired shape to the model. However, making curved surfaces is a bit of a challenge. Curve modeling – In this method, the surfaces are defined by curves. These curves are managed by weight controlling points. Increasing the weight of the point results in an increase in the curvature by bringing it closer to that particular point. On the contrary, reducing the weight of the point results in the flattening of the surface. Digital sculpting –  It is the use of software offering tools to manipulate the digital model as it is done with clay.