1：效果如上图，代码如下：

Shader "Unlit/fogshader"

{

Properties

{

_MainTex ("Texture", 2D) = "white" {}

}

SubShader

{

Tags { "RenderType"="Opaque" }

LOD 100

Pass

{

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

// make fog work

#pragma multi_compile_fog

#define vec2 float2

#define vec3 float3

#define vec4 float4

#define mix lerp

#define fract frac

#define iTime _Time.y

#define iResolution _ScreenParams

#include "UnityCG.cginc"

struct appdata

{

float4 vertex : POSITION;

float2 uv : TEXCOORD0;

};

struct v2f

{

float2 uv : TEXCOORD0;

float4 vertex : SV_POSITION;

};

sampler2D _MainTex;

float4 _MainTex_ST;

float rand(in vec2 sd) {

return fract(sin(dot(sd.xy, vec2(9.128, 3.256) * 293699.963)));

}

float n2D(in vec2 sd) {

vec2 iComp = floor(sd);

//integer and fractional components

vec2 fComp = fract(sd);

float a = rand(iComp + vec2(0.0, 0.0)); //

float b = rand(iComp + vec2(1.0, 0.0)); // interpolation points

float c = rand(iComp + vec2(0.0, 1.0)); // (4 corners)

float d = rand(iComp + vec2(1.0, 1.0)); //

vec2 fac = smoothstep(0.0, 1.0, fComp); //interpolation factor

//Quad corners interpolation

return

mix(a, b, fac.x) +

(c - a) * fac.y * (1.0 - fac.x) +

(d - b) * fac.x * fac.y;

}

//fractal Brownian Motion and Motion Pattern

#define OCTAVES 6

float fBM(in vec2 sd) {

//init values

float val = 0.0;

float freq = 1.0;

float amp = 0.5;

float lacunarity = 2.0;

float gain = 0.5;

//Octaves iterations

for (int i = 0; i < OCTAVES; i++) {

val += amp * n2D(sd * freq);

freq *= lacunarity;

amp *= gain;

}

return val;

}

float mp(in vec2 p) {

float qx = fBM(p + vec2(0.0, 0.0));

float qy = fBM(p + vec2(6.8, 2.4));

vec2 q = vec2(qx, qy);

float tm = 0.008 * iTime * 1.3; //time factor

float rx = fBM(p + 1.1 * q + vec2(9.5, 9.3) * tm);

float ry = fBM(p + 1.5 * q + vec2(7.2, 1.5) * -(tm + 0.002));

vec2 r = vec2(rx, ry);

return fBM(p + (2.0 * r));

}

//========================================================================

//main()

void mainImage(out vec4 fragColor, in vec2 fragCoord)

{

//Normalized pixel coordinates (from 0 to 1)

vec2 uv = fragCoord;// / iResolution.xy;

vec3 col = vec3(0.0,0.0,0.0);

//col += fBM(uv*3.0);

float wFac = mp(uv*3.0); //warping factor

col = mix(vec3(0.101961, 0.29608, 0.26567), vec3(0.66667, 0.45667, 0.89839), clamp(pow(wFac, 2.5), 0.0, 1.0));

col = mix(col, vec3(0.44467, 0.00567, 0.19809), clamp(pow(wFac, 0.4), 0.0, 1.0));

col = mix(col, vec3(0.52467, 0.42567, 0.01809), clamp(wFac * wFac, 0.0, 1.0));

col = mix(col, vec3(0.84467, 0.32567, 0.13809), clamp(smoothstep(0.0, 1.0, wFac), 0.0, 1.0));

// Output to screen

fragColor = vec4(col, 1.0);

}

v2f vert (appdata v)

{

v2f o;

o.vertex = UnityObjectToClipPos(v.vertex);

o.uv = TRANSFORM_TEX(v.uv, _MainTex);

return o;

}

fixed4 frag (v2f i) : SV_Target

{

// sample the texture

//fixed4 col = tex2D(_MainTex, i.uv);

vec4 col = vec4(0,0,0,0);

mainImage(col, i.uv);

return col;

}

ENDCG

}

}

}

本人qq：344810449，欢迎探讨研究。

有unity，shader，小程序，软件开发，游戏制作等需求也可以联系本人，非常乐于助人。

如果觉得还不错给博主来个小惊喜，纯属自愿，不强求：

作者：unity游侠

链接：https://blog.csdn.net/y90o08u28/article/details/107109606

来源：CSDN
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。