如何使用Physics2d.raycast檢測用光線擊中圖層

Question

我正在嘗試使用c＃為游戲制作一個建築方面。 我需要檢測我是否在某個層上構建。

我曾嘗試多次編輯下面的代碼，但我似乎無法找到問題。 我還觀看了多個視頻，這些視頻解釋了我的代碼應該有效，但也許我只是沒有看到一些東西。 任何幫助都會很棒。

這是我用於圖層檢測的代碼：

[SerializeField]
private LayerMask weaponNoBuildLayer;
[SerializeField]
private LayerMask pathNoBuildLayer;

private bool buildBlocked = false;

private GameObject blockTemplate;

        blockTemplate.transform.position = new Vector2(newPosx, newPosy);

        RaycastHit2D rayHit;
        if(currentBlock.isWeapon == true)
        {
            rayHit = Physics2D.Raycast(blockTemplate.transform.position, Vector2.zero, Mathf.Infinity, weaponNoBuildLayer);
        }
        else
        {
            rayHit = Physics2D.Raycast(blockTemplate.transform.position, Vector2.zero, Mathf.Infinity, pathNoBuildLayer);
        }
        if(rayHit.collider != null)
        {
            Debug.Log("yh");
            buildBlocked = true;
        }
        else
        {
            buildBlocked = false;
        }

這應該做的是，如果光線與某些圖層（在代碼中進一步設置為圖層掩碼）發生沖突，則將布爾buildBlocked設置為true，但它不會和buildBlocked永久錯誤。 再次，任何幫助將不勝感激。

Answer 1

來自https://docs.unity3d.com/ScriptReference/Physics.Raycast.html

// Bit shift the index of the layer (8) to get a bit mask
        int layerMask = 1 << 8;

        // This would cast rays only against colliders in layer 8.
        // But instead we want to collide against everything except layer 8. The ~ operator does this, it inverts a bitmask.
        layerMask = ~layerMask;

        RaycastHit hit;
        // Does the ray intersect any objects excluding the player layer
        if (Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, Mathf.Infinity, layerMask))
        {
            Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * hit.distance, Color.yellow);
            Debug.Log("Did Hit");
        }
        else
        {
            Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * 1000, Color.white);
            Debug.Log("Did not Hit");
        }