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Is it possible to declare an Enum containing all the Scene's layers (which would optionally be updated if/when layers change/are added removed) ? Basically I'm working on a little script that plays sounds when a GameObject collides with another object, and in some cases I want to check if the gameObject has collided with a Collider from a specific layer. Ideally I'd like to be able to choose which layer from said Enum in a public variable so I won't have to code any layer-specifics into the script. Thanks.
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I too am very interested in this idea!
Layers are already stored as a bitmask- it's a very straightforward conversion. However, I wouldn't try making an enum that can be 'updated' as layers are changed or updated- once an enum has been declared, it can't be changed. Why would you have to code 'layer-specifics' into your script? There's no reason why you can't just make a public LayerMask object, and compare against that.
http://unity3d.com/support/documentation/ScriptReference/LayerMask.html