unity3d老电视花屏闪烁效果

找到一般都是全屏的闪烁效果

于是就移植了一个shader可以用到模型上的

另外添加了一些控制参数

做了个小场景试试效果，如下图

Shader "Custom/Screen" {
	Properties{
		_MainTex("贴图", 2D) = "white" {}
		_TimeScale("花屏速度" , Range(0.0001, 2.0)) = 1.0
	}
		SubShader{
		Tags{ "RenderType" = "Opaque" }
		LOD 300

		pass {
		Cull Back
			
			CGPROGRAM
		#pragma vertex vert
		#pragma fragment frag

		#include "UnityCG.cginc"
		#define R frac(43.*sin(p.x*73.+p.y*8.))


		float _TimeScale;
		float sat(float t) {
			return clamp(t, 0.0, 1.0);
		}

		float2 sat(float2 t) {
			return clamp(t, 0.0, 1.0);
		}

		float remap(float t, float a, float b) {
			return sat((t - a) / (b - a));
		}

		float linterp(float t) {
			return sat(1.0 - abs(2.0*t - 1.0));
		}

		float3 spectrum_offset(float t) {
			float3 ret;
			float lo = step(t,0.5);
			float hi = 1.0 - lo;
			float w = linterp(remap(t, 1.0 / 6.0, 5.0 / 6.0));
			float neg_w = 1.0 - w;
			ret = float3(lo,1.0,hi) * float3(neg_w, w, neg_w);
			return pow(ret, float3(1.0 / 2.2, 1.0 / 2.2, 1.0 / 2.2));
		}

		float rand(float2 n) {
			return (sin(dot(float2(n.x *_TimeScale, n.y *_TimeScale), float2(12.9898, 78.233))));
		}

		float srand(float2 n) {
			return rand(n) * 2.0 - 1.0;
		}

		float mytrunc(float x, float num_levels)
		{
			return floor(x*num_levels) / num_levels;
		}
		float2 mytrunc(float2 x, float num_levels)
		{
			return floor(x*num_levels) / num_levels;
		}
			sampler2D _MainTex;
		float4 _MainTex_ST;
		float uvOffset;

		struct a2v {
			float4 vertex : POSITION;
			float3 normal : NORMAL;
			float4 texcoord : TEXCOORD0;
		};

		struct v2f {
			float4 pos : POSITION;
			float2 uv : TEXCOORD0;
			float3 color : TEXCOORD1;
		};

		v2f vert(a2v v) {
			v2f o; o.pos = UnityObjectToClipPos(v.vertex);
			o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
			o.color = ShadeVertexLights(v.vertex, v.normal);
			return o;
		}

		float4 frag(v2f i) : COLOR{
		float4 c;


		float aspect = _ScreenParams.x / _ScreenParams.y;
		aspect = 1;
		float2 uv = _ScreenParams.xy / _ScreenParams.xy;
		uv = float2(1,1);

		float time = fmod(_Time.y, 32.0); 
		float GLITCH = 10.1;

		float gnm = sat(GLITCH);
		float rnd0 = rand(mytrunc(float2(time, time), 6.0));
		float r0 = sat((1.0 - gnm)*0.7 + rnd0);
		float rnd1 = rand(float2(mytrunc(i.uv.x, 10.0*r0), time));
		float r1 = 0.5 - 0.5 * gnm + rnd1;
		r1 = 1.0 - max(0.0, ((r1<1.0) ? r1 : 0.9999999));
		float rnd2 = rand(float2(mytrunc(i.uv.y, 40.0*r1), time)); 
		float r2 = sat(rnd2);

		float rnd3 = rand(float2(mytrunc(i.uv.y, 10.0*r0), time));
		float r3 = (1.0 - sat(rnd3 + 0.8)) - 0.1;

		float pxrnd = rand(i.uv + time);

		float ofs = 0.05 * r2 * GLITCH * (rnd0 > 0.5 ? 1.0 : -1.0);
		ofs += 0.5 * pxrnd * ofs;

		i.uv.y += 0.1 * r3 * GLITCH;

		const int NUM_SAMPLES = 10;
		const float RCP_NUM_SAMPLES_F = 1.0 / float(NUM_SAMPLES);

		float4 sum = float4(0.0, 0.0, 0.0, 0.0);
		float3 wsum = float3(0.0, 0.0, 0.0);
		for (int j = 0; j

包含更多参数和场景的版本可以（场景和截图一样）

这里下载（两个都一样，使用unity版本5.6）

http://download.csdn.net/download/shenmifangke/9938098

http://download.csdn.net/download/shenmifangke/9938045