The answer is I don't' know. I look at the shot and just feel how to shoot it. Sometimes I will draw a line from pocket through ob to see contact point and get down and try to hit that spot on the ball. When I do that I miss about half the time. I started about 25 years and I have always feel the angle of the shot. I look at the angle the cue ball and object ball will take. I get down I have feel the shot and not a certain spot but maybe fractional hits on the ball like 1/4 or1/2. Is this how you shoot by feel and can you play pro level like this?