來自IQ大神的小教程，效果圖：

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shaderToy源碼：https://www.shadertoy.com/view/lsfGRr

教程視頻：https://www.bilibili.com/video/BV1KK4y1K7wM/

Unity項目代碼Git地址：https://github.com/Dejavu0709/Graphics.git

Shader "Graphics/MathEye"{Properties{//Properties}SubShader{Tags { "RenderType" = "Transparent" "Queue" = "Transparent" }Pass{ZWrite OffBlend SrcAlpha OneMinusSrcAlphaCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"struct VertexInput {float4 vertex : POSITION;float2 uv:TEXCOORD0;float4 tangent : TANGENT;float3 normal : NORMAL;//VertexInput};struct VertexOutput {float4 pos : SV_POSITION;float2 uv:TEXCOORD0;//VertexOutput};const float2x2 m = float2x2( 0.80, 0.60, -0.60, 0.80 );float hash( float n ){return frac(sin(n)*43758.5453);}float noise( in float2 x ){float2 p = floor(x);float2 f = frac(x);f = f*f*(3.0-2.0*f);float n = p.x + p.y*57.0;return lerp(lerp( hash(n+ 0.0), hash(n+ 1.0),f.x),lerp( hash(n+ 57.0), hash(n+ 58.0),f.x),f.y);}float fbm( float2 p ){float f = 0.0;f += 0.50000*noise( p ); p = m*float2x1(p)*2.02;f += 0.25000*noise( p ); p = m*float2x1(p)*2.03;f += 0.12500*noise( p ); p = m*float2x1(p)*2.01;f += 0.06250*noise( p ); p = m*float2x1(p)*2.04;f += 0.03125*noise( p );return f/0.984375;}float length2( float2 p ){float2 q = p*p*p*p;return pow( q.x + q.y, 1.0/4.0 );}VertexOutput vert (VertexInput v){VertexOutput o;o.pos = UnityObjectToClipPos (v.vertex);o.uv = v.uv;//VertexFactoryreturn o;}float4 frag(VertexOutput i) : SV_Target{float2 q = i.uv/1;float2 p = -1.0 + 2.0 * q;p.x *= 1/1;float r = length( p );float a = atan2(p.y,p.x);float3 col = float3( 1.0, 1.0, 1.0 );float ss = 0.5 + 0.5 * sin(7.0 * _Time.y);float anim = 1.0 + 0.1 * ss * clamp(1 - r, 0.0 , 1.0);r*= anim;if(r < 0.8){col = float3(0.0, 0.3, 0.4);float f = fbm(5 * p);col = lerp(col, float3(0.2,0.5,0.4),f);f = 1.0 - smoothstep(0.2, 0.5, r);col = lerp(col, float3(0.9,0.6,0.2),f);a += 0.05 * fbm(20.0 * p);f = smoothstep(0.3, 1.0, fbm(float2(6.0 * r, 20.0 * a)));col = lerp(col, float3(1.0,1.0,1.0),f);f = smoothstep(0.4, 0.9, fbm(float2(10.0 * r, 15.0 * a)));col *= 1.0 - 0.5 * f;f = smoothstep(0.6, 0.8, r);col *= 1.0 - 0.5 * f;f = smoothstep(0.2, 0.25, r);col *= f;f = 1.0 - smoothstep(0.0, 0.5 ,length(p - float2(0.24, 0.2))); col += float3(1.0, 0.9, 0.8) * f * 0.9; f = smoothstep(0.75, 0.8, r);col = lerp(col, float3(1.0,1.0,1.0),f);//col /= 2.2;}return float4( col, 1.0 );}ENDCG}} }

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