How do you use the Vision Sensor? I can't seem to get it!

Programming Support VEXcode V5 Tech Support
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Recently, my robotics team had the idea of implementing a sensor onto a robot.
We decided to use a vision sensor.

For some reason though, even reading the articles, I am still perplexed on this matter.

  1. How do you get it to detect something and then have a signal to perform an action?
  2. What does the “take a snapshot” and “when Vision object exists?” block even mean at all?
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Take snapshot let’s the vision take a picture of an object from a tuned signature. The largest object exists allows you to check if the vision sensor can see and object. You can get objects center x and center y as well as it’s size however I don’t know how to do it in blocks.
Here are some articles on how to set it up:

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