アルファ閾値は、Image で「ヒット」と考えられるイベントが発生したと判断するために、ピクセルになくてはならない最低のアルファを指定します。
閾値よりも低いアルファ値は、レイキャストイベントが Image で反応しない原因になります。値 1 にすると、完全に不透明なピクセルしか、Image でレイキャストイベントを起こすことができなくなります。アルファテストされたものは、画像スプライトのみから収集され、一方、Image の Graphic.color のアルファは無視されます。
alphaHitTestMinimumThreshold はデフォルトで 0 で、 Image 矩形中で発生したすべてのレイキャストイベントはヒットとみなされます。0 より大きい値で機能させるためには、Image に使用されるスプライトは読み取り可能なピクセルでなければなりません。これは、スプライトの Advanced Texture Import Settings の Read/Write enabled を有効にすることと、スプライトのアトラス化を無効にすることで実現できます。
using UnityEngine; using System.Collections; using UnityEngine.UI; // Required when Using UI elements.
public class ExampleClass : MonoBehaviour { public Image theButton;
// Use this for initialization void Start() { theButton.alphaHitTestMinimumThreshold = 0.5f; } }
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