1) Polygonal Modelling: In polygonal modelling points in 3D
space called vertices are connected by line segments to form a
polygonal mesh. Most of the 3D models created today are
using polygonal modelling because they are easy to create and
also the computer can render them easily. The main
disadvantage of polygonal modelling is that they polygons are
incapable of accurately representing curved surfaces, so a
large number of polygons must be used to represent curved
surfaces accurately.