Unity信号干扰Shader

崩坏3这种信号干扰效果用到噪音，其实就是把个噪音shader放到rendertexture对应的材质球就可以实现

噪音里面最关键的代码

frac(sin(dot(float2(x, y), float2(12.9898, 78.233))) * 43758.5453);

这些参数哪来的，看看这边链接介绍

https://blog.csdn.net/candycat1992/article/details/50346469

用dotween来控制噪音参数

_ScanLineJitter 扫描线

_VerticalJump 画面垂直跳

_HorizontalShake 画面左右震动

_ColorDrift 颜色偏移

具体效果

下面是噪音shader

Shader "Test/Glitch"
{
    Properties
    {
        _MainTex ("-", 2D) = "" {}
    }
    CGINCLUDE

    #include "UnityCG.cginc"

    sampler2D _MainTex;
    float2 _MainTex_TexelSize;

    float2 _ScanLineJitter; 
    float2 _VerticalJump;
    float _HorizontalShake;
    float2 _ColorDrift;

	//计算噪音公式
    float nrand(float x, float y)
    {
        return frac(sin(dot(float2(x, y), float2(12.9898, 78.233))) * 43758.5453);
    }

    half4 frag(v2f_img i) : SV_Target
    {
        float u = i.uv.x;
        float v = i.uv.y;

        //扫描线
        float jitter = nrand(v, _Time.x) * 2 - 1;
        jitter *= step(_ScanLineJitter.y, abs(jitter)) * _ScanLineJitter.x;

        //画面垂直跳
        float jump = lerp(v, frac(v + _VerticalJump.y), _VerticalJump.x);

        //画面左右震动
        float shake = (nrand(_Time.x, 2) - 0.5) * _HorizontalShake;

        //颜色偏移
        float drift = sin(jump + _ColorDrift.y) * _ColorDrift.x;

        half4 src1 = tex2D(_MainTex, frac(float2(u + jitter + shake, jump)));
        half4 src2 = tex2D(_MainTex, frac(float2(u + jitter + shake + drift, jump)));

        return half4(src1.r, src2.g, src1.b, 1);
    }

    ENDCG
    SubShader
    {
        Pass
        {
            ZTest Always Cull Off ZWrite Off
            CGPROGRAM
            #pragma vertex vert_img
            #pragma fragment frag
            #pragma target 3.0
            ENDCG
        }
    }
}

控制shader参数脚本

去掉awake里面的代码就可以手动调对应参数

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;

public class testnoise : MonoBehaviour {

    public Material mmm;

    [SerializeField, Range(0, 1)]
    float _scanLineJitter = 0;

    public float scanLineJitter
    {
        get { return _scanLineJitter; }
        set { _scanLineJitter = value; }
    }

    [SerializeField, Range(0, 1)]
    float _verticalJump = 0;

    public float verticalJump
    {
        get { return _verticalJump; }
        set { _verticalJump = value; }
    }

    [SerializeField, Range(0, 1)]
    float _horizontalShake = 0;

    public float horizontalShake
    {
        get { return _horizontalShake; }
        set { _horizontalShake = value; }
    }

    [SerializeField, Range(0, 1)]
    float _colorDrift = 0;

    public float colorDrift
    {
        get { return _colorDrift; }
        set { _colorDrift = value; }
    }
    float _verticalJumpTime;

    private void Awake()
    {
        DOTween.To(() => _scanLineJitter, x => _scanLineJitter = x, 1f, 0.6f).SetLoops(-1, LoopType.Yoyo);
        DOTween.To(() => _colorDrift, x => _colorDrift = x, 0.1f, 1f).SetLoops(-1, LoopType.Yoyo);
    }

    public void Update()
    {
        _verticalJumpTime += Time.deltaTime * _verticalJump * 11.3f;

        var sl_thresh = Mathf.Clamp01(1.0f - _scanLineJitter * 1.2f);
        var sl_disp = 0.002f + Mathf.Pow(_scanLineJitter, 3) * 0.05f;
        mmm.SetVector("_ScanLineJitter", new Vector2(sl_disp, sl_thresh));

        var vj = new Vector2(_verticalJump, _verticalJumpTime);
        mmm.SetVector("_VerticalJump", vj);

        mmm.SetFloat("_HorizontalShake", _horizontalShake * 0.2f);

        var cd = new Vector2(_colorDrift * 0.04f, Time.time * 606.11f);
        mmm.SetVector("_ColorDrift", cd);
    }
}

工程

链接：https://pan.baidu.com/s/1Za7042576CEzUUMXJiI5sA 密码：mcn6