Make an object pulse to a beat

Archived Forums Questions & Answers
1

Hi there,
Im trying to make an object pulse to the beat of a soundtrack. The effect I want to achieve is something like the centre hexagon of this game: http://distractionware.com/games/flash/hexagon/.
I already implemented the solution given on this thread, but here the movement is too continuous. I need to have my wave more discreet, like a fast peak and then back to normal.
How can I achieve such an effect?
Thank you!

3 Answers

3
2

It is fairly easy and you can make remarkable stuff with the function GetSpectrumData in the AudioSource-class. For instance: http://youtu.be/zvciEKEjuXI

Have a look at aldonaletto’s answer for more details on how to attack this with code.

Uhm, this look quite advanced to me (I'm a bit of a noob) :( I wonder if there is a way to implement a pulse effect starting from the code I linked before (so without a real spectrum analysis, just setting a bpm value and make my object bounce to the BPM).

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@kurai: Comments! Use comments. This is not an answer to your question.

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3

This is a great tutorial, I reccomend you check it out :slight_smile:

4

Here is my code copy / paste it its complicated :expressionless:

PulsingObject.cs

using System.Collections;
using UnityEngine;

[RequireComponent(typeof (AudioSource))]
public class PulsingObject : MonoBehaviour
{

    AudioSource _audioSource;
    public static float[] _samples = new float[512];
    public static float[] _freqBand = new float[8];

    // Start is called before the first frame update
    void Start()
    {
        _audioSource = GetComponent<AudioSource>();
    }

    // Update is called once per frame
    void Update()
    {
        GetSpectrumData();
        MakeFrequencyBands();
    }

    void GetSpectrumData()
    {
        _audioSource.GetSpectrumData(_samples, 0, FFTWindow.Blackman);
    }

    void MakeFrequencyBands()
    {
        int count = 0;

        for (int i = 0; i < 8; i++)
        {
            float average = 0;
            int sampleCount = (int)Mathf.Pow(2, i) * 2;

            if (i == 7)
            {
                sampleCount += 2;
            }
            for (int j = 0; j < sampleCount; j++)
            {
                average += _samples[count] * (count + 1);
                count++;
            }

            average /= count;

            _freqBand _= average * 10;_

}
}
}
Place this script on an empty object called Audio.
_____________________________________________________________________________________
PResize.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PResize : MonoBehaviour
{

public int _band;
public float _startScale, _scaleMultiplier;

// Start is called before the first frame update
void Start()
{

}

// Update is called once per frame
void Update()
{
transform.localScale = new Vector3((PulsingObject._freqBand[_band] * _scaleMultiplier) + _startScale, (PulsingObject._freqBand[_band] * _scaleMultiplier)+ _startScale, transform.localScale.z);
}
}

Place this script on any objects you want to pulse.
Thanks -Mika.