surface typically represents the boundary of a solid object in 3D space (R3).
say a surface is a 2D topological manifold (two-manifold)
meaning that at a point on the surface, we can define a local coordinate patch on
which a two-dimensional coordinate system is defined.
example, the surface of the earth is a two-manifold, with positions described
by latitude and longitude.In
computer graphics, there are different ways to represent a surface. In computer games, the typical approach is to
model a surface as a collection of polygons (normally triangles).