Why do I need bitwise shift operator in linecast?

Question

In the sample 2D project with 4.3, there is this line:

grounded = Physics2D.Linecast(transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));

I understand all of this and implemented something similar in my own project. But I don't understand why I need the '1 <<' bit when using the LayerMask.NameToLayer function.

If I don't include it in my project then it doesn't work of course, but why not? I've looked up what the '<<' means and it still makes no sense to me.

Can someone quickly explain what I've missed please? Cheers.

Answer 1

Answer by AlucardJay · Mar 19, 2014 at 08:21 PM

Bunny83 did an excellent answer for this, but I cannot find it. Here's another that may be useful : http://answers.unity3d.com/questions/8715/how-do-i-use-layermasks.html

Also read the Documentation, scroll down to Casting Rays Selectively

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Why do I need bitwise shift operator in linecast?

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