void keyboardFunc(unsigned char key, int x, int y){    if (key=='w')    {        ypos-=50;    }    if (key==27)    {        exit(0);    }}void reshapeFunc(int x, int y){    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    gluPerspective(45, width/height, 1.0, 1000.0);    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();    gluLookAt (xpos, ypos, zpos,                  0, 0, 0,                  0, 1, 0);}void displayFunc(){    glClearColor(0,0,1,1);    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    gluLookAt (xpos, ypos, zpos,                  0, 0, 0,                  0, 1, 0);    glBegin(GL_TRIANGLES);     glColor3f(1,1,1);    for(unsigned int i = 0; i < myMesh.nVertices*3;i+=3)    {        glVertex3f(myMesh.vertices[i+0],                   myMesh.vertices[i+1],                   myMesh.vertices[i+2]);    }    glEnd();    glutSwapBuffers();}void load(){    //load a mesh}int main(int argc, char *argv[]){    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);    glutInitWindowSize(width, height);    glutInitWindowPosition(0,0);    glutCreateWindow("openGL");    glutKeyboardFunc(keyboardFunc);    glutReshapeFunc(reshapeFunc);    glutDisplayFunc(displayFunc);    load();   glutMainLoop();}