Physics.IgnoreLayerCollision  

static function IgnoreLayerCollision (layer1 : int, layer2 : int, ignore : boolean = true) : void

Description

Makes the collision detection system ignore all collisions between any collider in layer1 and any collider in layer2.

You can set the default values for your project for any layer combinations in the Physics inspector. See Also: Physics.GetIgnoreLayerCollision,Physics.IgnoreCollision