Bi-Quadratic Interpolation of Intensity for Fast Shading of Three Dimensional Objects

Researchers in the field of Computer Graphics are often confronted with the trade off between visual realism and computational cost. So far, Phong and Gouraud shading have been treated as well established methods and attempts have been made to improve visual realism or to reduce computational cost or both. These methods use linear interpolation to compute the normals or intensity, respectively, at each point on the surface. However, it has been proved that no surface would yield proper distribution of illumination generated by the traditional Phong shading. Attempts have been made to improve the defects of linear interpolation used in Phong shading. One such attempt is the use of biquadratic normal vector interpolation. In this paper we have propose d an algorithm to achieve the visual realism of this method and at the same time we have reduced the cost of shading.