如何在 Unity 中实例化对象？

Space只是一个枚举，与您正在尝试的无关！（其目的是为 egTransform.Rotate或定义相对变换空间Transform.Translate）

在那个枚举 afaik

• Space.World 只是具有 int 值 0
• Space.Self 具有 int 值 1

所以你实际上做的是

Instantiate(prefab, player.transform.position * 2 * 0);

等于

Instantiate(prefab, Vector3.zero);

这意味着对象在 World 位置实例化0,0,0。

还使用

Instantiate(prefab, player.transform.position * 2);

看起来有点奇怪。您确定要复制 的实际position值player吗？这意味着生成的对象总是与玩家和世界在一条线上，并且0,0,0离中心的距离总是与玩家一样远。

对我来说，这听起来更像是你宁愿在玩家面前产生一些东西......取决于玩家的视线方向（通常在自上而下的游戏中player.transform.up或player.transform.right）所以我猜你想要做的是

Instantiate(prefab, player.transform.position + player.transform.forward * 2);

这将2在玩家对象前面生成对象Unity 单位

您的评论后，它听起来像，而不是你想对球员位置产卵的对象X-axis，但“在它”在Y-axis这样

Instantiate(prefab, player.transform.position + Vector3.Up * 2);

也许您必须2根据播放器的移动方式以及“屏幕外”的距离来调整。或者，您也可以使用更复杂的使用Camera.ScreenToWorldPoint

// get players position
var playerPos = player.transform.position;

// get camera's position
var cameraPos = Camera.main.transform.position;

// get difference on Z-axis
var cameraDistance = cameraPos.z - playerPos.z;

// Get the world 3d point for the upper camera border
// don't care about the X value
// and as distance we use the z-distance to the player
var cameraTopPoint = Camera.main.ScreenToWorldPoint(new Vector3(0, Camera.main.pixelHeight, cameraDistance);

// use the players X-axis position
cameraTopPoint.x = player.transform.x;

// to spawn it exactly on the Screen border above the player
Instantiate(prefab, cameraTopPoint);

// or to spawn it a bit higher
Instantiate(prefab, cameraTopPoint + Vector3.Up * 1);

更新

您说您希望预制件在 X 轴上玩家位置的“对面”生成。

如果您的相机在世界 x=0 上是静态的，那么这实际上非常简单：

cameraTopPoint.x = -player.transform.x;

如果您的相机是否在 x=0 上移动，那么我们必须已经在屏幕位置级别计算它：

// get players position
var playerPos = player.transform.position;

// additionally convert the player position to screen space
var playerScreenPos = Camera.main.WorldToScreenPoint(playerPos);

var centerX = Camera.main.pixelWidth / 2.0f;

// get the difference between camera an player X (in screen space)
var differenceX = Mathf.Abs(playerScreenPos.x - centerX);

// here calculate the opposide side
var targetX = centerX + differenceX * (playerScreenPos.x < centerX ? 1 : -1);
// or alternatively if you want e.g. that the prefab always
// spawn with a bit of distance to the player even though he is very close
// to the center of the screen you could do something like
//var targetX = centerX + centerX / 2 * (playerScreenPos.x < centerX ? 1 : -1);

// Get the world 3d point for the upper camera border
// with the calculated X value
// and as distance we use the z-distance to the player
var cameraTopPoint = Camera.main.ScreenToWorldPoint(new Vector3(targetX, Camera.main.pixelHeight, playerScreenPos.z);

// to spawn it exactly on the Screen border above the player
Instantiate(prefab, cameraTopPoint);

// or to spawn it a bit higher
Instantiate(prefab, cameraTopPoint + Vector3.Up * 1);

其他更新

好的，所以您希望预制件始终在玩家旁边一定距离处生成。一侧取决于玩家在屏幕的哪一侧，因此您实际上可以再次使用第一种方法，但只需添加所需的距离：

// Adjust this is the Inspector (in Unity units)
public float spawnDistanceToPlayer;

...

// get players position
var playerPos = player.transform.position;

// additionally convert the player position to screen space
var playerScreenPos = Camera.main.WorldToScreenPoint(playerPos);

var centerX = Camera.main.pixelWidth / 2.0f;

// Get the world 3d point for the upper camera border
// with the calculated X value
// and as distance we use the z-distance to the player
var cameraTopPoint = Camera.main.ScreenToWorldPoint(new Vector3(playerScreenPos.x, Camera.main.pixelHeight, playerScreenPos.z);

// now add or reduce spawnDistanceToPlayer 
// depending on which side of the screen he is
cameraTopPoint.x += spawnDistanceToPlayer * (playerScreenPos.x < centerX ? 1 : -1);

// OR if your camera sits static on X=0 anyway you also could compare
// the player position directly without calculating in screenspace:
cameraTopPoint.x += spawnDistanceToPlayer * (playerPos.x < 0 ? 1 : -1);

// to spawn it exactly on the Screen border above the player
Instantiate(prefab, cameraTopPoint);

// or to spawn it a bit higher
Instantiate(prefab, cameraTopPoint + Vector3.Up * 1);

在智能手机上输入，因此可能无法“复制粘贴”；)