54 lines
2.0 KiB
C#
54 lines
2.0 KiB
C#
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using System.Collections;
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using UnityEngine;
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/**
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* 因为物体在不断随着鼠标的运动而旋转，所以旋转时一定要在世界坐标中，否则我们会看到物体绕着自身的旋转轴旋转，这是不对的。
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* 另外，我们都是通过camera来看到的，所以Rotate的第一个参数axis一定要是camera的某个轴向，左右方向的旋转需要绕着camera的up方向，
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* 上下方向的旋转需要绕着camera的right方向。
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*/
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public class ModelRotate : MonoBehaviour
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{
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private Vector3 startPos;
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private Quaternion startRot;
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private Vector3 screenPoint;
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private Vector3 offset;
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private Camera mCamera;
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public void Init(Camera c)
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{
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startPos = transform.localPosition;
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startRot = transform.localRotation;
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mCamera = c;
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}
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private void OnMouseDown()
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{
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if (mCamera == null) return;
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screenPoint = mCamera.WorldToScreenPoint(transform.position);
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offset = transform.position - mCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
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}
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private void OnMouseDrag()
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{
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if (mCamera == null) return;
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Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
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Vector3 curWorldPoint = mCamera.ScreenToWorldPoint(curScreenPoint);
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transform.position = curWorldPoint + offset;
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}
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private void Update()
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{
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RotateXY();
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}
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private void RotateXY()
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{
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if (Input.GetMouseButton(1))
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{
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Vector3 vaxis = Vector3.Cross(Vector3.forward, Vector3.right);
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transform.Rotate(vaxis, Input.GetAxis("Mouse X") * 7, Space.World);
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Vector3 haxis = Vector3.Cross(Vector3.forward, Vector3.up);
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transform.Rotate(haxis, -Input.GetAxis("Mouse Y") * 7, Space.World);
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}
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}
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public void ResetPosAndRot()
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{
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transform.localPosition = startPos;
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transform.localRotation = startRot;
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}
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}
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