An efficient algorithm to eliminate hidden lines using orthographic projection
Elimination of hidden lines is mandatory for realistic representation of real objects on computer screens. Many efficient algorithms proposed by eminent researchers are available to eliminate the hidden line. One of the most popular algorithms is depth algorithm which uses depth of each pixel on the surface and scans the entire buffer. This technique requires high memory to store the information of each pixel. In this work we propose an efficient algorithm to eliminate hidden lines using orthographic projections. The proposed algorithm obtains the orthographic projection of line and surface on the view plane. Both surface and line, we can uniquely identify them with the help of extreme vertex points. Then by using concept of line clipping, we compute the point of intersection of the line with boundaries of the obscuring surface and then clipping between point of intersection gives elimination of the hidden portion of the line.