[游戏开发]【Unity】碰撞器相关备忘

• 始终显示碰撞体：

Physics2D.alwaysShowColliders = true;

• Composite Collider组件：2D 复合碰撞体 (Composite Collider 2D) - Unity 手册

????????附加到该Composite Collider的碰撞体需要勾选Used by Composite

• 设置A层与B层是否检测碰撞：

Unity - Scripting API: Physics2D.IgnoreLayerCollision

Physics2D.IgnoreLayerCollision(8, 9,true);//忽略8与9层的碰撞

bool ignored = Physics2D.GetIgnoreLayerCollision(8 , 9 );  //检查8与9层的碰撞是否被忽略

• 检查某一点是否在某个碰撞器范围内：Physics2D.OverlapPoint ( pointPosition, layerMask )

    void IsOnGround(Vector2 position)
    {
        Collider2D collider_Ground = Physics2D.OverlapPoint(position, 1 << LayerID_Ground);
        if (collider_Ground != null)
        {
            Debug.Log("在地面上。");
        }
        Debug.LogWarning("!!!不在地面上");
    }