3D Graphic

Development Platform:
Visual C++

Vector.cpp：Code Content
							/** 3DGPL *************************************************
 * ()                                                     *
 * Header for operations on vectors used by the ray       *
 * tracer.                                                *
 *                                                        *
 * Defines:                                               *
 *  V_zero                   Initialize a vector;         *
 *  V_vector_coordinates     Set the vector's coordinates;*
 *  V_vector_points          Make a vector from points;   *
 *  V_set                    Copy a vector;               *
 *  V_multiply               Multiply by a scalar;        *
 *  V_scalar_product         Find a scalar product;       *
 *  V_vector_product         Find a vector product;       *
 *  V_sum                    Sum two vectors;             *
 *  V_difference             Compute difference;          *
 *  V_unit_vector            Compute unit vector;         *
 *  V_plane                  Coeffs of a plane equation;  *
 *  V_vertex_on_plane        Checks if in the plane.      *
 *                                                        *
 * (c) 1995-98 Sergei Savchenko, (savs@cs.mcgill.ca)      *
**********************************************************/
#include <math.h>                           /* sqrt */
#include "vector.h"               /* self definition */
/**********************************************************
 * Initialize a vector to zero.                           *
 *                                                        *
 * RETURNS: Initializeed vector.                          *
 * --------                                               *
**********************************************************/
float *V_zero(float *vec)
{
//一个float型的指针和一个矢量有什么关系

						