awangenh

/* ============================================================================= *
 *      COMPUTE AND DRAW A BICUBIC SURFACE PATCH USING FORWARD DIFFERENCES       *
 *                                                                               *
 * This code implements and provides corrections to the algorithm named          *
 * DrawSurfaceFwdDif presented in Fig.11.46 at page 525 of the book              *
 * Computer Graphics - Principles and Practice 2.ed in C by Jamed D.Foley et.al. *
 * This algorithm was neither corrected nor repeated in the 3rd (present)        *
 * edition of Foley et.al.'s book.                                               *
 *                                                                               *
 * The algorithm, as stated in the book, does not work: There is one error and   *