how does our perception affect our sense of touch? does a schizophrenic able to see a hallucinations and able to Touch them physically?

I'm not sure about scizophrenia, but I recall reading that people under the effects of LSD have their sense of touch affected as well.

Otherwise the hallucinations would be much less realistic and easier to ignore.

That hallucinations in schizophrenia are usually auditory, as in "hearing voices". There's a condition known as "synestheisia" that can be caused by drugs and certain physiological conditions where sensations are switched around, so a person experiences, for example, "seeing" sounds, and "hearing" colors. So in this case, I suppose a person could "feel (touch)" an odor, but the odor would have to be real.

I don't know of a phenomena specifically where a person sees a hallucination, and can sense touching it, but I wouldn't think it beyond the realm of human experience. The closest thing I know of is sleep paralysis, where people awaken from sleep (mostly), are aware of being awake, and can't move. This can be accompanied by "hynagogic" hallucinations with the same sort of sensations and perceptions you'd get in a dream. But this is a dreaming brain, not an hallucinating one.