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Question by eeveelution8 · Jul 10, 2014 at 07:56 PM · raycastraycastingraybegginermanual

project a ray in a straight line

I am working on raycasts for the first time, and have looked at the various kinds of ways a raycast can be done in the manual. I imagine raycasts are hard to understand for people new to it, because I cannot tell which of the rays casts a single line in a one direction.

this is the manuals page I'm looking at, http://docs.unity3d.com/ScriptReference/Physics.Raycast.html

what I'm asking is which script shown casts a single line in a single direction.

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Answer by NoseKills · Jul 10, 2014 at 08:29 PM

All of them :)

A Ray in Unity is basically always a 3-dimensional vector that has a starting point and length (length can be infinite)

When they say:

Casts a ray against all colliders in the scene.

It just means that the ray will produce a hit (return value "true") from all colliders in the scene that it hits (as opposed to some of the calls that filter out colliders based on their layers for example)

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