void TimerFunc( int value ) { yRot1 -= 5; if (yRot1 <=-130) yRot1=-130; { glutPostRedisplay(); glutTimerFunc(120,TimerFunc,1); } } above is my code,my facing problem was the object rotate at one time only after one clip,when i hit the second clip the timer wouldn't run. any solution.

Sorry, I don't quite understand what you mean by "after one clip" and "second clip" could you share a little more information about the problem?

your problem is that you are setting your timer variable to -130 immediately after your if statement i would think