add: win->frameExit();
context: display(void){    static float a = 0;    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );    glPushMatrix();    glRotatef( a, 0,1,0 );//    glMultMatrixf(accumM.getValues());    dact->apply( root );    glPopMatrix();    a+=1;    accumM.mult(stepM);    glutSwapBuffers();}