三维物体的统一三维四元数旋转透镜
三维物体的统一三维四元数旋转透镜
提问于 2020-02-21 06:20:32
我在做一个团结项目。有一个汽车雨刷，我想旋转它的方式，当我预先“雨刷切换”雨刷开始旋转从0,0, 0 ,0，-45，并开始勒平。但是当我按下“雨刷开关”时，雨刷必须旋转回0,0,0。例如，如果当前的雨刷旋转为0,0，-20，并且我按下“雨刷切换关闭”键，它们必须是rotateTowards 0,0,0。另外，如果我再次按下“雨刷开关”，雨刷必须开始从0,0,0到0,0，-45旋转。现在，情况是雨刷是旋转的，但当我按下“雨刷开关关闭”，雨刷停止在相同的当前旋转点，例如(0,0，-30)。当我再一次按下“雨刷开关”时，雨刷就会从奇怪的不同的旋转点开始。这是我的代码：
using UnityEngine;
using System.Collections;
public class Wipers : MonoBehaviour
{
[SerializeField] protected Vector3 m_from = new Vector3(0.0F, 0.0F, 0.0F);
[SerializeField] protected Vector3 m_to = new Vector3(0.0F, -45.0F, 0.0F);
[SerializeField] protected float m_frequency = 1.0F;
protected virtual void Update()
{
if (ControlFreak2.CF2Input.GetAxis ("wipers") != 0)
{
Quaternion from = Quaternion.Euler(this.m_from);
Quaternion to = Quaternion.Euler(this.m_to);
float lerp = 0.5F * (1.0F + Mathf.Sin(Mathf.PI * Time.realtimeSinceStartup * this.m_frequency));
this.transform.localRotation = Quaternion.Lerp(from, to, lerp);
}
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2020-02-21 07:03:42
- 打开时的问题是，您直接使用的是
Time.realtimeSinceStartup，当然，在关闭例程时，它也继续运行！所以你永远不知道什么时候雨刷会被打开。 →，您更愿意使用的时间，因为雨刷，从哪里开始。 - 当你关闭时，你的问题当然是你立即停止移动。 →你宁愿总是完成一个完整的循环后，雨刷已关闭。
与其在Update中这样做，我建议使用一个柯鲁丁。与直接在Update中进行操作相比，协同工作更容易控制和维护。实际上，它们就像小的临时更新，像例程一样，在真正的Update完成后立即执行。
一个协同器，你可以让它继续和完成一个完整的周期，直到它实际完成。
在Update中，您将只检查用户输入并启动一个例程(如果没有一个已经在运行)，并且该例程可以独立运行和终止一个完整的循环：
[SerializeField] protected Vector3 m_from = new Vector3(0.0F, 0.0F, 0.0F);
[SerializeField] protected Vector3 m_to = new Vector3(0.0F, -45.0F, 0.0F);
[SerializeField] protected float m_frequency = 1.0F;
// TODO only for debugging
[SerializeField] private bool ControlFreak2Dummy;
private bool wipersOn;
private Quaternion from;
private Quaternion to;
private void Awake()
{
// Store these once -> more efficient then recalculate them everytime
from = Quaternion.Euler(m_from);
to = Quaternion.Euler(m_to);
}
protected virtual void Update()
{
// TODO switch these back
//if (ControlFreak2.CF2Input.GetAxis ("wipers") != 0)
if (ControlFreak2Dummy)
{
if(!wipersOn)
{
StartCoroutine(Wipers());
}
}
}
// To make things easier for us this in itself closed routine is exactly ONE FULL wipers cycle
// so we can determine exactly when a full cycle is done or not
private IEnumerator Wipers()
{
// block concurrent routines
wipersOn = true;
var duration = 1f / m_frequency;
var timePassed = 0f;
while (timePassed <= duration)
{
// Note: Your sinus factor calculation was a bit strange
// (or maybe this early I'm way too stupid for maths lol ^^)
// It was always minimum 0.5 and maximum 1, you rather want to pingpong between 0 and 1
//
// This now moves forth and back exactly once between 0 and 1
var factor = Mathf.Sin(Mathf.PI * timePassed / duration);
transform.localRotation = Quaternion.Lerp(from, to, factor);
// increase timePassed by the time passed since last frame
timePassed += Time.deltaTime;
// allows Unity to "pause" here, render this frame and
// continue from here in the next frame
yield return null;
}
// make sur it really terminates in 0
transform.localRotation = from;
// tell others that this routine is done
wipersOn = false;
}
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60333130
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