Getting distance to the goal

[DjMaddius]

Just wondering what other teams are using/have used to get the distance to the goal. If I have the distance to the goal I can throw the distance into my equation for our shooter and spit out the angle I need the shooter at to make the shot. Really, my quesetion is what is the most efficient manner when using vision processing to get the distance to the 3 ptn frisbee goal? I'm using java right now (doing a build on labview and java)

Any help is much appreciated!