在OpenGL C++中绘制一个球和两个圆锥体

我有一个代码，我想一次画一个碗和两个圆锥体。

但是，它只显示了那些圆锥体，而没有显示球。

#include <GL/glut.h>
#include <stdlib.h>
#include <Math.h>     // Needed for sin, cos
#define PI 3.14159265f
GLfloat ballRadius = 0.5f;   // Radius of the bouncing ball
GLfloat ballX = 0.0f;        // Ball's center (x, y) position
GLfloat ballY = 0.0f;
GLfloat ballXMax, ballXMin, ballYMax, ballYMin; // Ball's center (x, y) bounds
GLfloat xSpeed = 0.02f;      // Ball's speed in x and y directions
GLfloat ySpeed = 0.007f;
int refreshMillis = 30;      // Refresh period in milliseconds

static void resize(int width, int height)
{
    const float ar = (float) width / (float) height;
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

}
static void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

//这是未绘制的球的代码。

    ***glTranslatef(ballX, ballY, 0.0f);  // Translate to (xPos, yPos)
     // Use triangular segments to form a circle
     glBegin(GL_TRIANGLE_FAN);
        glColor3f(1.0f, 0.0f, 0.0f);  // Blue
        glVertex2f(0.0f, 0.0f);       // Center of circle
        int numSegments = 100;
        GLfloat angle;
        for (int i = 0; i <= numSegments; i++) { // Last vertex same as first vertex
           angle = i * 2.0f * PI / numSegments;  // 360 deg for all segments
           glVertex2f(cos(angle) * ballRadius, sin(angle) * ballRadius);
        }
     glEnd();***

//球结束代码

     glColor3d(0,1,0);
    glPushMatrix();
        glTranslated(-1.0,0.5,-6);
        glRotated(65, -1.0, 0.0, 0.0);
        glutSolidCone(1, 2, 70, 50);
    glPopMatrix();
    glPushMatrix();
        glTranslated(0.0,-1.5,-6);
        glRotated(65, -1.0, 3.0, 0.0);
        glutWireCone(1,2, 16, 16);
    glPopMatrix();
    glutSwapBuffers();
}

/* Program entry point */
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitWindowSize(740,580);
    glutInitWindowPosition(10,10);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Programming Techniques - 3D Cones");
    glutReshapeFunc(resize);
    glutDisplayFunc(display);
    glClearColor(1,1,1,1);
 glutMainLoop();
    return EXIT_SUCCESS;
}