Computer Graphics (CG) is the art of rendering,
and visualizing images on the computer screens. In threedimensional
(3D) CG, a scene is first modeled geometrically,
typically using triangles, and the computer is then used to
calculate what the scene will look like from a specific view point
at a particular instant. In CG, one of the major goals is to create
photo-realistic images in real time. In recent years, Volume
Visualization (VV) has attracted the attention of many
researchers. VV techniques have been used to analyze and render
3D datasets, obtained from a variety of sources including medical
scanners, and results of simulation of physical and synthetic
phenomena, on the computer screen. Volume Graphics (VG) has
proven itself as an independent graphics technology. A common
purpose of VG is to achieve photo realistic rendering. To achieve
this, reflections, shadows, refraction and perspective projections
are all necessary elements since they occur naturally in the
natural environment.