Unity随机小技巧

最新推荐文章于 2024-04-15 16:41:33 发布

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最新推荐文章于 2024-04-15 16:41:33 发布

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分类专栏： unity3d 文章标签： unity3d random

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本文介绍使用Unity实现随机位置生成和随机颜色选择的方法。通过CircleRd和SphereRd两个脚本，演示如何在圆内和球体内随机生成物体，并为每个物体赋予随机颜色。适用于游戏开发中需要随机元素的场景。

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Color Random.ColorHSV() 颜色随机
Vector3 Random.insideUnitCircle 圈内位置随机
Vector3 Random.insideUnitSphere 球体内位置随机

public class CircleRd : MonoBehaviour
{
    [SerializeField] GameObject prefab;
    [Range(0, 10), SerializeField] float radius = 5.0f;

    void Update()
    {
        if (Input.GetKey(KeyCode.C))
            InsideCircle();
    }

    void InsideCircle()
    {
        GameObject newCube = Instantiate(prefab);
        newCube.transform.SetParent(transform);
        Vector2 randomPos = Random.insideUnitCircle;
        Vector3 newRandomPos = new Vector3(randomPos.x, 0, randomPos.y);
        newCube.transform.localPosition = newRandomPos * radius;
        newCube.GetComponent<MeshRenderer>().material.color = Random.ColorHSV();
    }
    void DrawCircle()
    {
        Gizmos.color = Color.white;
        float theta = 0;
        float x = radius * Mathf.Cos(theta);
        float y = radius * Mathf.Sin(theta);
        Vector3 pos = transform.position + new Vector3(x, 0, y);
        Vector3 newPos = pos;
        Vector3 lastPos = pos;
        for (theta = 0.1f; theta < Mathf.PI * 2; theta += 0.1f)
        {
            x = radius * Mathf.Cos(theta);
            y = radius * Mathf.Sin(theta);
            newPos = transform.position + new Vector3(x, 0, y);
            Gizmos.DrawLine(pos, newPos);
            pos = newPos;
        }
        Gizmos.DrawLine(pos, lastPos);
    }

    void OnDrawGizmos()
    {
        DrawCircle();
    }
}

public class SphereRd : MonoBehaviour
{
    [SerializeField] GameObject prefab;
    [Range(0, 10), SerializeField] float radius = 5.0f;

    void Update()
    {
        if (Input.GetKey(KeyCode.S))
            InsideSphere();
    }

    void InsideSphere()
    {
        GameObject newCube = Instantiate(prefab);
        newCube.transform.SetParent(transform);
        newCube.transform.localPosition = Random.insideUnitSphere * radius;
        newCube.GetComponent<MeshRenderer>().material.color = Random.ColorHSV();
    }
    void DrawSphere()
    {
        Gizmos.color = Color.green;
        Gizmos.DrawWireSphere(transform.position, radius);
    }

    void OnDrawGizmos()
    {
        DrawSphere();
    }
}