2D 空間でのレイ
レイ とは空間上の点から指定された方向に伸びる線分です。レイには Unity で多くの用途がありますが、もっとも良く使用されるのが Raycast です。このテクニックによりレイの開始地点からセンサーのように何かのオブジェクトと交差するか判定します。これは発射物の軌跡をプロットしたり、視界の判定、共通的に使用できる多くのゲームメカニックの実装に役に立ちます。
関連項目: Physics2D.Raycast、Ray クラス、RaycastHit2D クラス .
Ray2D | Creates a 2D ray starting at origin along direction. |
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