OpenGL 练习10 Approximation of Sphere

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#include<gl/glut.h>#include<math.h>#include<stdlib.h> //a point data typetypedef GLfloat point3[3]; point3 v[] = {{0.0, 0.0, 1.0}, {0.0, 0.942809, -0.333333}, {-0.816497, -0.471405, -0.333333}, {0.816497, -0.471405, -0.333333}}; static int k = 5; void triangle(point3 a, point3 b, point3 c){    glVertex3fv(a);    glVertex3fv(b);    glVertex3fv(c);} void normalize(point3 v1, point3 v2, point3 &v3){    float len = sqrt((v1[0]+v2[0])*(v1[0]+v2[0])+(v1[1]+v2[1])*(v1[1]+v2[1])+(v1[2]+v2[2])*(v1[2]+v2[2]));    v3[0] = (v1[0]+v2[0])/len;    v3[1] = (v1[1]+v2[1])/len;    v3[2] = (v1[2]+v2[2])/len;} void divide_triangle(point3 a, point3 b, point3 c, int k){    point3 ab, ac, bc;    normalize(a, b, ab);    normalize(a, c, ac);    normalize(b, c, bc);     if (k > 0)    {        divide_triangle(a, ac, ab, k-1);        divide_triangle(c, bc, ac, k-1);        divide_triangle(b, ab, bc, k-1);        divide_triangle(ab, ac, bc, k-1);    }    else {        triangle(a, b, c);    }}void tetra(){    divide_triangle(v[0], v[1], v[2], k);    divide_triangle(v[3], v[2], v[1], k);    divide_triangle(v[0], v[3], v[1], k);    divide_triangle(v[0], v[2], v[3], k);} void renderScene(void){    glClearColor(1.0, 1.0, 1.0, 0.0);//注意事项：要在glClear之前设置color！     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// 清除屏幕及深度缓存     glMatrixMode(GL_PROJECTION);//投影矩阵        glLoadIdentity();        gluPerspective(45, 1, 1, 1000);     glMatrixMode(GL_MODELVIEW);//模型矩阵        glLoadIdentity();        gluLookAt(0, 0, 3, 0, 0, 0, 0, 1, 0);     glEnable(GL_DEPTH_TEST);          // 设置正反面为填充模式    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);     glBegin(GL_TRIANGLES);    glColor3f(0.0f, 1.0f, 0.0f);//设置顶点颜色    //tetra(v[0], v[1], v[2], v[3], 6);    tetra();    glEnd();     glutSwapBuffers();//当窗口模式为双缓存时，此函数的功能就是把后台缓存的内容交换到前台显示。当然，只有单缓存时，使用它的功能跟用glFlush()一样。而使用双缓存是为了把完整图画一次性显示在窗口上，或者是为了实现动画。}  int main(int argc, char *argv[]){    glutInit(&argc, argv);//初始化GLUT    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);//设置图形显示模式。GLUT_DEPTH：使用深度缓存；GLUT_DOUBLE：使用双缓存；    glutInitWindowPosition(100, 100);//设置窗口显示位置    glutInitWindowSize(600,600);//设置窗口大小    glutCreateWindow("Approximation of Sphere");//创建带标题的窗口    glutDisplayFunc(renderScene);//为当前窗口设置显示回调函数    glutMainLoop();//进入GLUT事件处理循环    return 0;}
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