Question

这应该是一项简单的任务，我已经用Google搜索了，但我无法弄清楚为什么任何一个例子都适合我。

基本上，我想在我的第一人称游戏中将瓷砖放在地上。我希望我想放置在地面上的物体在空中“漂浮”，同时选择它的完美位置。我可以实例化该对象，使其成为玩家相机的孩子，但我无法将X单位定位在相机前;它总是最终“在”玩家身上;

public void StartPlacing ( Item item ) {
    Object itemPrefab = Resources.Load( "Prefabs/" + item.prefabName );

    GameObject itemObject = (GameObject)Instantiate( itemPrefab );
    itemObject.transform.parent = playerCamera.transform;

    // What to do here to place it in front of the camera? I've tried this:
    itemObject.localPosition = new Vector3( 0, 0, 5 );
}

更新：相机是播放器（角色控制器）的孩子，相机处于透视模式。

Answer 1

您可以使用对象的forward vector，如下所示：

public GameObject frontObject;
public float distance;

void Update () {
    frontObject.transform.position = Camera.main.transform.position + Camera.main.transform.forward * distance;
}

Answer 2

感谢所有有用的建议，大家！我提出了以下适合我需要的代码：

using UnityEngine;
using System.Collections;

public class ConstructionController : MonoBehaviour {

    private Camera playerCamera;
    private GameObject itemObject;
    private float distance = 3.0f;

    // Use this for initialization
    void Start () {
        playerCamera = GetComponentInChildren<Camera>();
    }

    // Update is called once per frame
    void Update () {

        if ( itemObject != null ) {
            itemObject.transform.position = playerCamera.transform.position + playerCamera.transform.forward * distance;
            itemObject.transform.rotation = new Quaternion( 0.0f, playerCamera.transform.rotation.y, 0.0f, playerCamera.transform.rotation.w );
        }

    }

    // Start constructing an item
    public void StartConstructingItem ( Item item ) {
        Object itemPrefab = Resources.Load( "Prefabs/" + item.prefabName );

        itemObject = (GameObject)Instantiate( itemPrefab );
    }

}

将物体放在相机前面

2 个答案: