在 Unity 中，围绕另一个对象旋转一个对象就像在场景编辑器中按住 Alt 并单击左键进行旋转

Question

我尝试过组合两个RotateArounds，然后读取鼠标偏移量，但是当它到达顶部时它会剧烈摇晃。我尝试将其锁定在90度，但还是不行。我还没有找到实现它的好方法，因为常规旋转也存在万向节锁定问题。

我希望能够实现类似于Unity编辑器中Alt+左键单击的轨道旋转，并且也是在顶部锁定90度，而不是到达顶部后继续轨道旋转，这样会导致屏幕倒转.

Answer 1

以下脚本附加到您的

Camera

对象：

• 根据鼠标移动输入，围绕通过检查器提供的对象的

  Transform

  旋转相机
• 夹紧顶部和底部的旋转

    using UnityEngine;

    public class OrbitCamera : MonoBehaviour
    {
        [Tooltip("Transform of an object about which's center point camera should rotate")]
        public Transform objToRotAbout;
        [Tooltip("Rotation speed. Multiplication factor for mouse movement delta")]
        public float rotationSpeed = 0.05f;
    
        [Tooltip("Position of mouse in last frame")]
        private Vector3 lastMousePos;
        [Tooltip("Pose of camera in last frame")]
        private Pose lastCamPose;
    
    
        void Update()
        {
            // On mouse button down initially
            if (Input.GetMouseButtonDown(0))
            {
                // Start with current mouse position
                lastMousePos = Input.mousePosition;
            }
    
            // On mouse button pressed down continuously
            if (Input.GetMouseButton(0))
            {
                // Rotate camera about object center
                RotateCamera();
            }
        }
    
        void RotateCamera()
        {
            // Calculate mouse movement delta & update last mouse position to current
            Vector3 mouseDelta = Input.mousePosition - lastMousePos;
            lastMousePos = Input.mousePosition;
    
            // Calculate rotation amount based on mouse movement delta
            float mouseX = mouseDelta.x * rotationSpeed;
            float mouseY = mouseDelta.y * rotationSpeed;
    
            // Store previous camera pose
            lastCamPose = new Pose(transform.position, transform.rotation);
    
            // Rotate camera about object
            transform.RotateAround(objToRotAbout.position, Vector3.up, mouseX);
            transform.RotateAround(objToRotAbout.position, transform.right, -mouseY);
    
            // If camera upside down -> Revert to previous rotation
            if (Vector3.Dot(transform.up, Vector3.down) > 0)
            {
                transform.SetPositionAndRotation(lastCamPose.position, lastCamPose.rotation);
            }
        }
    }

目前，如果检测到相机颠倒，它会重置相机姿势。相反，您也可以先旋转占位符，检查它是否过度旋转，然后仅在满足条件时更新相机的姿势。但这种形式也确实有效。