คือผมเขียนโค้ด รูปสี่เหลี่ยมแบบ3D แต่คือมันยังผิดอยู่อีก 8 ตัวผมพยายามหาแล้วแต่ก็ยังรันไม่ได้ครับ
ผู้รู้ช่วยที

GLfloat xt=0.0, yt=0.0, zt=0.0;
Glfloat xs=1.0, ys=1.0, zs=1.0;
GLfloat xangle=20.0,yangle=20.0,zangle=20.0;
GLint window;

void init(void)
{
    glEnable(GL_DEPTH_TEST);
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    glOrtho(-6,6,-6,6,-6,6);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}
void myDisplay(void)
{
    glclear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    //Anti-Alias
    glEnable (GL_LINE_SMOOTH);
    glEnable (GL_BLEND);
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    
    glColor3f(0.0,0.0,1.0);            //set color to blue.
    glBegin (GL_LINES);                //Draw x-axis
        glVertex3f (-5.5, 0.0, 0.0);
        glVertex3f  (5.5, 0.0, 0.0);
    glEnd( );

    glBegin (GL_LINES);            //Draw y-axis
        glVertex3f (0.0,-5.5, 0.0);
        glVertex3f  (0.0, 5.5, 0.0);
    glEnd( );
    
    glPushMatrix();
    glTranslatef(xt, yt, 0.0);            //Translation
    glScalef(xs, ys, 1.0);                //Scaling
    glRotatef(xangle, 1.0, 0.0, 0.0);    //Rotate x-axis
    glRotatef(yangle, 0.0, 1.0, 0.0);    //Rotate y-axis
    glRotatef(zangle, 0.0, 0.0, 1.0);    //Rotate z-axis
    
    glColor3f(0.0, 0.0, 1.0);            //set color to blue
    
    glutWireCube (2);
    //glutWireTeapot (2);
    
    glPopMatrix();
    glutSwapBuffers();
    glFlush ( );
}

void KeyboardAssign (GLubyte key, GLint x, GLint y)
{
    switch (key)
{
    case ESCAPE :
        printf("escape pressed. exit.\n");
        glutDestroyWindow(window);
        exit(0);
        break;
        
    case 't':
        xt += 0.2;                            //xt=xt*2
        glutPostRedisplay();
        break;    
    case 'T':
        yt += 0.2;                            //xt=xt*2
        glutPostRedisplay();
        break;    
    case 's':                                //Scale y up
        xs += 0.2;
        glutPostRedisplay();
        break;    
    case 'S':                                //Scale y up
        ys += 0.2;
        glutPostRedisplay();
        break;    
    case 'x':                        //Rotate Counter ClockWise x-axis
        xangle += 10.0;
        glutPostRedisplay();
        break;
    case 'y':                        //Rotate Counter ClockWise y-axis
        yangle += 10.0;
        glutPostRedisplay();
        break;    
    case 'z':                        //Rotate Counter ClockWise x-axis
        zangle += 10.0;
        glutPostRedisplay();
        break;
    default:
    break;
   }
}

void main (int argc, char** argv)
{
    glutInit (&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    glutInitWindowPosition (50,50);
    glutInitWindowSize(500,500);
    glutCreateWindow("t=tran x, T=tran y, s=scale x, S=scale y, x=rot x, y=rot y, z=rot z");
    int();
    glutDisplayFunc (myDisplay);
    glutIdleFunc(myDisPlay);
    glutKeyboardFunc (KeyboardAssign);
    glutMainLoop();
}