如何让玩家能够在 Unity 中围绕立方体旋转相机？

Question

我创建了新的 Unity 项目，在中心添加了一个立方体，现在想让玩家能够通过滑动和/或鼠标拖动来围绕这个立方体旋转相机。

请说出简单的实施步骤或关键字以找到答案或在哪里阅读？

Answer 1

public Transform Target;

public float distance = 2.0f;
public float xSpeed = 20.0f;
public float ySpeed = 20.0f;
public float yMinLimit = -90f;
public float yMaxLimit = 90f;
public float distanceMin = 10f;
public float distanceMax = 10f;
public float smoothTime = 2f;
float rotationYAxis = 0.0f;
float rotationXAxis = 0.0f;
float velocityX = 0.0f;
float velocityY = 0.0f;

void Update()
{
    if (Input.GetMouseButton(0))
    {
        velocityX += xSpeed * Input.GetAxis("Mouse X") * distance * 0.02f;
        velocityY += ySpeed * Input.GetAxis("Mouse Y") * 0.02f;
    }
    rotationYAxis += velocityX;
    rotationXAxis -= velocityY;
    rotationXAxis = ClampAngle(rotationXAxis, yMinLimit, yMaxLimit);

    Quaternion rotation = Quaternion.Euler(rotationXAxis, rotationYAxis, 0);

    Vector3 negDistance = new Vector3(0.0f, 0.0f, -distance);
    Vector3 position = rotation * negDistance + Target.position;

    transform.rotation = rotation;
    transform.position = position;
    velocityX = Mathf.Lerp(velocityX, 0, Time.deltaTime * smoothTime);
    velocityY = Mathf.Lerp(velocityY, 0, Time.deltaTime * smoothTime);
}

public static float ClampAngle(float angle, float min, float max)
{
    if (angle < -360F)
        angle += 360F;
    if (angle > 360F)
        angle -= 360F;
    return Mathf.Clamp(angle, min, max);
}

取自https://answers.unity.com/questions/1257281/how-to-rotate-camera-orbit-around-a-game-object-on.html

如果您只想围绕特定轴旋转，例如围绕 Y，您基本上可以这样做

this.transform.RotateAround(Target.transform.position, Vector3.up, Input.GetAxis("Mouse X")*20.0f);

Answer 2

创建一个名为“CameraRotate”的新 C# 脚本，打开它并粘贴此脚本：

    using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraRotate : MonoBehaviour {

    public Transform cube;

    public float sensitivityX;
    public float sensitivityY;
    GameObject pivot;

    void Start () {
        pivot = new GameObject ("pivot");
        pivot.transform.position = cube.position;
        transform.SetParent (pivot.transform);
    }

    void Update () {
        pivot.transform.eulerAngles += new Vector3 (Input.GetAxis ("Mouse Y") * -sensitivityX * Time.deltaTime, Input.GetAxis ("Mouse X") * sensitivityY * Time.deltaTime, 0);
    }
}

将此脚本分配给您的相机，然后在 Inspector 选项卡中，选择相机，将您的 Cube（拖动）分配到“cube”插槽中，并为灵敏度字段分配一个值（我使用了大约 500），按玩和测试。

这个脚本有什么作用？ 它在 Cube 的中心创建一个新的 GameObject 作为旋转的参考，称为枢轴。因此它将相机设置为枢轴的子节点，并根据您的鼠标轴旋转枢轴。

Answer 3

我是这样写的：

float mouseX = -Input.GetAxis("Mouse X");
float mouseY = -Input.GetAxis("Mouse Y");

float magnitude = transform.position.magnitude;

Vector3 mouseSwipe = new Vector3(mouseX, mouseY, 0);
Vector3 startPoint = new Vector3((float)camera.pixelWidth / 2, (float)camera.pixelHeight / 2, magnitude - 1);

Vector3 startPointWorld = camera.ScreenToViewportPoint(startPoint);
Vector3 endPointWord = camera.ScreenToViewportPoint(startPoint + mouseSwipe);

Vector3 mouseSwipeWord = endPointWord - startPointWorld;

float dragLat = mouseSwipeWord.y;
float dragLng = mouseSwipeWord.x;

Vector3 oldPosition = transform.position / magnitude;

float lat = Mathf.Asin(oldPosition.y);
float rsmall = Mathf.Acos(oldPosition.y);

float lng = Mathf.Atan2(oldPosition.z / rsmall, oldPosition.x / rsmall);

lat += dragLat * 10 * 2 * Mathf.PI;
if( lat*180/Mathf.PI > 80 )
{
    lat = 80 * Mathf.PI / 180;
}
else if( lat*180/Mathf.PI < -80)
{
    lat = -80 * Mathf.PI / 180;
}

lng += dragLng * 10 * 2 * Mathf.PI * 2;



float y = Mathf.Sin(lat);
rsmall = Mathf.Cos(lat);

float x = rsmall * Mathf.Cos(lng);
float z = rsmall * Mathf.Sin(lng);

Vector3 newPosition = new Vector3(x, y, z);
newPosition *= magnitude;

transform.position = newPosition;

LookAtTarget();

目标是模拟鼠标通过拖动来旋转对象。