效果图如上：

步骤:略。

实现代码如下：

1 /**********************************************************************  2   3   VertexArray Tutorial  4   5   June, 10th, 2000  6   7   This tutorial was written by Philipp Crocoll  8   Contact:   9     philipp.crocoll@web.de 10     www.codecolony.de 11  12   Every comment would be appreciated. 13  14   If you want to use parts of any code of mine: 15     let me know and 16     use it! 17 *********************************************************************** 18  19   p : switches between line and point mode 20  21 ***********************************************************************/ 22  23 #include 
     
       24 #include 
      
        25 #include 
       
         26 using namespace std; 27 #define PI 3.1415265359 28 struct SVertex 29 { 30     GLfloat x,y,z; 31     GLfloat r,g,b; 32 }; 33  34 //Data for the sphere vertices: 35 SVertex * Vertices; 36 int NumVertices;  //size of the vertex array 37 vector 
        
          IndexVect;  //we first put the indices into this vector, then copy them to the array below 38 GLuint * Indices; 39 int NumIndices;   //size of the index array 40  41 GLfloat ChangeY = 0.025;//Indicates how much the y values of the highest and deepest vertex 42                         //in the sphere are changed each time it is rendered 43 float yRotated = 0.0; 44 bool PointsOnly = false;//Indicated, if the triangles or only points are drawn 45  46 // 参数1：水平点的个数；参数2：纵向点的个数； 47 void CreateSphere(int PointRows, int PointsPerRow)  48 { 49     NumVertices = (PointRows-2)*PointsPerRow + 2; // 总点数 50     Vertices = new SVertex[NumVertices]; 51     free(Indices); 52     IndexVect.clear();  //to be sure it is empty 清空 53     float x,y,z; 54     int i,j; 55     double r; 56     for (i = 1; i < (PointRows-1); i++) 57     { 58         for (j = 0; j < PointsPerRow; j++) 59         { 60             y = 1.0 - float(i) / float(PointRows-1)*2.0;  61             r = sin (acos(y));  //  这个以Y为轴的圆的半径。 62             x = r * sin(float(j) / float(PointsPerRow)*PI*2.0);   // 这个以X为轴的圆与上面的圆的交点的X坐标 63              64             z = r * cos(float(j) / float(PointsPerRow)*PI*2.0); // 这个以Z为轴的圆与上面的圆的交点的Z坐标 65             Vertices[(i-1)*PointsPerRow+j].x = x; 66             Vertices[(i-1)*PointsPerRow+j].y = y; 67             Vertices[(i-1)*PointsPerRow+j].z = z; 68             Vertices[(i-1)*PointsPerRow+j].r = (float)(i) / float(PointRows); 69             Vertices[(i-1)*PointsPerRow+j].g = 0.6; 70             Vertices[(i-1)*PointsPerRow+j].b = (float)(j) / float(PointsPerRow); 71         } 72  73     } 74     //The highest and deepest vertices:   // 最值点 --上下各1个。 75     Vertices[(PointRows-2)*PointsPerRow].x = 0.0; 76     Vertices[(PointRows-2)*PointsPerRow].y = 1.0; 77     Vertices[(PointRows-2)*PointsPerRow].z = 0.0; 78     Vertices[(PointRows-2)*PointsPerRow].r = 1.0; 79     Vertices[(PointRows-2)*PointsPerRow].g = 0.7; 80     Vertices[(PointRows-2)*PointsPerRow].b = 1.0; 81     Vertices[(PointRows-2)*PointsPerRow+1].x = 0.0; 82     Vertices[(PointRows-2)*PointsPerRow+1].y = -1.0; 83     Vertices[(PointRows-2)*PointsPerRow+1].z = 0.0; 84     Vertices[(PointRows-2)*PointsPerRow+1].r = 1.0; 85     Vertices[(PointRows-2)*PointsPerRow+1].g = 0.7; 86     Vertices[(PointRows-2)*PointsPerRow+1].b = 1.0; 87      88     for (i = 1; i < (PointRows-2); i++) 89     { 90         for (j = 0; j < (PointsPerRow-1); j++) 91         { // 当PointsPerRow= 8 ，首次赋的值是？？ 92             IndexVect.push_back((i-1)*PointsPerRow+j);            // 0 1 93             IndexVect.push_back((i-1)*PointsPerRow+j+1);        // 1 2 94             IndexVect.push_back((i)*PointsPerRow+j);                // 8 9 95  96             IndexVect.push_back((i-1)*PointsPerRow+j+1);        // 1 2 97             IndexVect.push_back((i)*PointsPerRow+j+1);            // 9 10 98             IndexVect.push_back((i)*PointsPerRow+j);                // 8 9 99         }100         // 连接左右两侧的线结构101         IndexVect.push_back((i-1)*PointsPerRow+PointsPerRow-1); // 7102         IndexVect.push_back((i-1)*PointsPerRow);  // 0103         IndexVect.push_back((i)*PointsPerRow+j); // 16104 105         IndexVect.push_back((i)*PointsPerRow); // 8106         IndexVect.push_back((i-1)*PointsPerRow); // 0107         IndexVect.push_back((i)*PointsPerRow+j); // 16108     }        109 110     //The triangles to the highest and deepest vertices: // 连接三角形的最高和最深的顶点111     for (j = 0; j< (PointsPerRow-1); j++)112     {113         IndexVect.push_back(j);114         IndexVect.push_back(j+1);115         IndexVect.push_back((PointRows-2)*PointsPerRow);116     }117     IndexVect.push_back(j);118     IndexVect.push_back(0);119     IndexVect.push_back((PointRows-2)*PointsPerRow);120 121     for (j = 0; j< (PointsPerRow-1); j++)122     {123         IndexVect.push_back((PointRows-3)*PointsPerRow+j);124         IndexVect.push_back((PointRows-3)*PointsPerRow+j+1);125         IndexVect.push_back((PointRows-2)*PointsPerRow+1);126     }127     IndexVect.push_back((PointRows-3)*PointsPerRow+j);128     IndexVect.push_back((PointRows-3)*PointsPerRow);129     IndexVect.push_back((PointRows-2)*PointsPerRow+1);130 131     Indices = new GLuint[IndexVect.size()];  //allocate the required memory132     for (i = 0; i < IndexVect.size(); i++)133     {134         Indices[i] = IndexVect[i]; // 复制顶点数组到临时空间。135     }136     NumIndices = IndexVect.size();137     IndexVect.clear();  //no longer needed, takes only memory  释放空间138 }139 140 void DrawSphere(void)141 {142     if (!PointsOnly)143         glDrawElements(    GL_TRIANGLES, //mode 三角形 144                         NumIndices,  //count, ie. how many indices 绘制图元的数量乘上一个图元的顶点数 (*3)145                         GL_UNSIGNED_INT, //type of the index array 索引值的类型146                         Indices);  // 指向索引存贮位置的指针147     else 148         glDrawArrays(GL_POINTS,0,NumVertices);149 150 }151 152 void Display(void)153 {154     glClear(GL_COLOR_BUFFER_BIT);155     glLoadIdentity();156     glTranslatef(0.0,0.0,-3.2); // 为了显示全部图像157     glRotatef(yRotated, 0.0, 1.0, 0.0); // 旋转图像158     DrawSphere(); // 用户自定义绘制函数159     glFlush();            //Finish rendering160     glutSwapBuffers();161 }162 163 void Reshape(int x, int y)164 {165     if (y == 0 || x == 0) return;  //Nothing is visible then, so return166     //Set a new projection matrix167     glMatrixMode(GL_PROJECTION);  168     glLoadIdentity();169     //Angle of view:40 degrees170     //Near clipping plane distance: 0.5171     //Far clipping plane distance: 20.0172     gluPerspective(60.0,(GLdouble)x/(GLdouble)y,0.5,20.0);173     glViewport(0,0,x,y);  //Use the whole window for rendering174     glMatrixMode(GL_MODELVIEW);175     176 }177 178 static long long times = 0;179 void Idle(void)180 {181     times++; // 延迟182     if(times>500000)183         times =0;184     if(times% 500000== 0)185     {186          Vertices[NumVertices-2].y += ChangeY; // 最高点变化187         Vertices[NumVertices-1].y -= ChangeY;// 最低点变化188 189         if (Vertices[NumVertices-2].y> 1.5 || Vertices[NumVertices-2].y< 0.5)190             ChangeY *= -1; // 变化值的取反191         yRotated += 0.3; // 以Y为轴的旋转角度192         Display();193     }194 }195  196 void Keyboard(unsigned char key, int x, int y)197 {198     switch(key)199     {200     case 'p': 201         PointsOnly = !PointsOnly;202         break;203     }204 }205 206 int main (int argc, char **argv)207 {208     //Initialize GLUT209     glutInit(&argc, argv);210     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);211     glutInitWindowSize(300,300);212     //Create a window with rendering context and everything else we need213     glutCreateWindow("Vertex Arrays");214     //compute the vertices and indices215     CreateSphere(16,16);216     //as we do not yet use a depth buffer, we cannot fill our sphere217     glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);218     //Enable the vertex array functionality:219     glEnableClientState(GL_VERTEX_ARRAY); // 开启“顶点数组”220     glEnableClientState(GL_COLOR_ARRAY); // 开启“颜色数组”221     glVertexPointer(    3,   //3 components per vertex (x,y,z)222                         GL_FLOAT,223                         sizeof(SVertex),224                         Vertices);225     glColorPointer(        3,   //3 components per vertex (r,g,b)226                         GL_FLOAT,227                         sizeof(SVertex),228                         &Vertices[0].r);  //Pointer to the first color229     glPointSize(3.0); // 点大小230     glClearColor(0.0,0.0,0.0,0.0); // 黑色231     //Assign the two used Msg-routines232     glutDisplayFunc(Display);233     glutReshapeFunc(Reshape);234     glutKeyboardFunc(Keyboard);235     glutIdleFunc(Idle);236     //Let GLUT get the msgs237     glutMainLoop();238     return 0;239 }