Unity 3D音频可视化项目：Vector3转Float失败求解决

错误原因 #

你修改后的代码里，这一行存在类型不匹配问题：

this.transform.localScale = new Vector3(this.transform.localScale, baseHeight + _spectrumBand * height, this.transform.localScale);

Vector3的构造函数需要传入三个float类型的参数，但你传入的是整个transform.localScale（Vector3类型）和计算后的baseHeight + _spectrumBand * height（Vector3类型），C#无法自动将Vector3转换成float，因此报错。

两种解决方案 #

方案1：完全均匀缩放（三个轴同步同比例缩放） #

如果你的需求是三个轴按照同一比例缩放，不需要每个轴单独设置基础值和幅度，可以保持baseHeight和height为float类型，直接计算统一的缩放值应用到三个轴：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using static SAP.SapVars;

public class GrowSap : MonoBehaviour
{
    private RedactedForPrivacy sap;
    public SapSetBand growBand;
    public int band;
    public float height; // 控制整体缩放幅度
    public float baseHeight; // 控制整体基础缩放值
    private float _spectrumBand;

    void Start()
    {
        sap = RedactedForPrivacy._SapInstance;
    }

    void Update()
    {
        switch(growBand.bandType)
        {
            case BandType.Raw:
                _spectrumBand = sap.GetSpectrumBand(growBand.source, growBand.spectrum, band);
                break;

            case BandType.Smooth:
                _spectrumBand = sap.GetSpectrumBandSmooth(growBand.source, growBand.spectrum, band);
                break;

            case BandType.Trigger:
                _spectrumBand = sap.GetSpectrumBandTrigger(growBand.source, growBand.spectrum, growBand.trigger, band);
                break;
        }

        // 计算统一缩放值，应用到X/Y/Z三轴
        float targetScale = baseHeight + _spectrumBand * height;
        transform.localScale = new Vector3(targetScale, targetScale, targetScale);
    }
}

方案2：三轴独立设置基础值和缩放幅度 #

如果需要每个轴使用不同的基础缩放值和幅度（比如X轴基础1、Y轴基础2、Z轴基础3），可以保留baseHeight和height的Vector3类型，分别计算每个轴的float值：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using static SAP.SapVars;

public class GrowSap : MonoBehaviour
{
    private RedactedForPrivacy sap;
    public SapSetBand growBand;
    public int band;
    public Vector3 height; // 每个轴单独的缩放幅度
    public Vector3 baseHeight; // 每个轴单独的基础缩放值
    private float _spectrumBand;

    void Start()
    {
        sap = RedactedForPrivacy._SapInstance;
    }

    void Update()
    {
        switch(growBand.bandType)
        {
            case BandType.Raw:
                _spectrumBand = sap.GetSpectrumBand(growBand.source, growBand.spectrum, band);
                break;

            case BandType.Smooth:
                _spectrumBand = sap.GetSpectrumBandSmooth(growBand.source, growBand.spectrum, band);
                break;

            case BandType.Trigger:
                _spectrumBand = sap.GetSpectrumBandTrigger(growBand.source, growBand.spectrum, growBand.trigger, band);
                break;
        }

        // 分别计算三轴的目标缩放值
        float scaleX = baseHeight.x + _spectrumBand * height.x;
        float scaleY = baseHeight.y + _spectrumBand * height.y;
        float scaleZ = baseHeight.z + _spectrumBand * height.z;
        transform.localScale = new Vector3(scaleX, scaleY, scaleZ);
    }
}

内容的提问来源于stack exchange，提问作者Jeremy Romanowski