幾何中我們要畫一個圓,因為圓的标準表達式是
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIyZuBnLzYTNxMTNyADMxEzMwEjMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
圓心為(a,b),半徑為r。那麼我們隻要知道圓心和半徑就可以了。
我們隻要知道圓心,半徑,和旋轉弧度就可以了。
在Unity中建立測試工程,添加代碼Circles
using UnityEngine;
using System.Collections;
public class circle : MonoBehaviour
{
public GameObject circleModel;
//旋轉改變的角度
public int changeAngle = 0;
//旋轉一周需要的預制物體個數
private int count;
private float angle = 0;
public float r = 5;
// Use this for initialization
void Start()
{
count = (int)360 / changeAngle;
for (int i = 0; i<count; i++)
{
Vector3 center = circleModel.transform.position;
GameObject cube = (GameObject)Instantiate(circleModel);
float hudu = (angle / 180) * Mathf.PI;
float xx = center.x + r * Mathf.Cos(hudu);
float yy = center.y + r * Mathf.Sin(hudu);
cube.transform.position = new Vector3(xx, yy, 0);
cube.transform.LookAt(center);
angle += changeAngle;
}
}
}
代碼第28行cube.transform.LookAt(center);所有生成的物體都是朝向圓心的。
将此腳本管道MainCamera上即可,添加預制對象。