A NEW SHADING MODEL FOR LINEAR LIGHT SOURCE

A new shading model for linear light source is presented.It accounts for both diffuse reflection and specular reflection of the illuminated surface.By regarding a linear light source as a directional rectangular light source with infinitesimal width,a simple formula is derived for calculating the diffuse reflection component.The specular reflection component is represented by an integration taking Phong's specular model as the kernel and evaluated by a linear approximation.Finally,an efficient shadow detection algorithm for linear light source is proposed.The images rendered with the shading model are very photorealistic.