What body turn for a 3/4 shot.

Well, it depends which swing "method" you're following.

Some methods teach a takeaway initiated by the shoulders, which means that your torso is already actively winding up at the start of the backswing.

Others say to keep the shoulders and torso inactive until the arms get to halfway up/horizontal on the backswing. But all that means you're not actually pushing with your shoulders until that point. But try to swing this way and you'll see that in fact you still have to wind you're torso somewhat because your shoulders have already rotated.

Either way, even for a half swing/pitch shot, and more so for a 3/4 swing, where your arms rise to somewhere about 30 degrees from the horizontal, you'll have some shoulder turn and therefore torso twisting.

But the difference in torque between a half swing and 3/4 should feel fairly significant. With a half swing, there will be less torque, and therefore the shot is easier to control and lets you gain confidence, and that's why you should start with pitches in that drill I detailed before and after move up to 3/4 swings, where the torque will be greater, and control a little less easy to master.

Tom