mapping applies an image to a geometric primitive.
mapping can dramatically increase realism without having to geometrically model
first “law” of computer graphics: If it
looks right, it is right.
mapping can be used for many purposes, including
materials (bricks, wood, etc.)
geometric complexity (polygons)
The advantage of texture mapping is
that visual detail is in the image, not
in the geometry. Thus, the complexity of an image does
not affect the vertex processing in OpenGL.