If i was the director

If i was to direct the dagger scene in Macbeth, i would definitely make him look mad. i would do this by having Macbeth actually grab a dagger out of the air when he says "come, let me clutch thee". Then have him look at it and it would disappear, this would  make him appear as though he never had the dagger in the first place. this will definitely make him look mad, by giving him the illusion that he was holding the dagger that he was obviously hallucinating.

Is MacBeth mad?

In MacBeth; act two, scene one, MacBeth is definitely mad.
this is shown because in the scene MacBeth is seen talking to himself about murdering king Duncan. I know he is mad because of what he says in the scene. "Is this a dagger that i see before me? The handle toward my hand? come, let me clutch thee".(2.1- lines 33-34) In this scene MacBeth is clearly hallucinating a dagger in front of him and a quote that he will say later prooves this. "I dont have you but i can see you. Fatefull Apparition, isnt it possible to touch you as well as see you? or are you nothing more than a dagger of the mind, a hallucination of my fevered brain?"(2.1-lines37-39). this prooves that he is mad because he speaks of how he has  a "fevered brain" , this is a sign that he is sick and that is why he is seeing things.