1：先上图(参考shadertoy的)

2：在上代码：

Shader "Unlit/candle"

{

Properties

{

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

_iResolutionX("_iResolutionX", float) = 1920.0

_iResolutionY("_iResolutionY", float) = 1080.0

}

SubShader

{

Tags { "RenderType"="Opaque" }

LOD 100

Pass

{

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#include "UnityCG.cginc"

struct appdata

{

float4 vertex : POSITION;

float2 uv : TEXCOORD0;

};

struct v2f

{

float2 uv : TEXCOORD0;

UNITY_FOG_COORDS(1)

float4 vertex : SV_POSITION;

};

sampler2D _MainTex;

float4 _MainTex_ST;

float _iResolutionX;

float _iResolutionY;

float2x2 rotz(float angle)

{

float2x2 m;

m[0][0] = cos(angle); m[0][1] = -sin(angle);

m[1][0] = sin(angle); m[1][1] = cos(angle);

return m;

}

float rand(float2 co) {

return frac(sin(dot(co.xy, float2(12.9898, 78.233))) * 43758.5453);

}

float fbm(float2 uv)

{

float n = (tex2D(_MainTex, uv).r - 0.5) * 0.5;

n += (tex2D(_MainTex, uv * 2.0).r - 0.5) * 0.5 * 0.5;

n += (tex2D(_MainTex, uv * 3.0).r - 0.5) * 0.5 * 0.5 * 0.5;

return n + 0.5;

}

// -----------------------------------------------

float4 mainImage( in float2 fragCoord)

{

//float2 uv = fragCoord.xy / iResolution.xy;

float2 uv = fragCoord;

float2 _uv = uv;

uv -= float2(0.5,0.0);

uv.y /= _iResolutionX / _iResolutionY;

float2 centerUV = uv;

// height variation from fbm

float variationH = fbm(float2(_Time.x * 0.3,0.0)) * 1.1;

// flame "speed"

float2 offset = float2(0.0, -_Time.x * 0.15);

// flame turbulence

float f = fbm(uv * 0.1 + offset); // rotation from fbm

float l = max(0.1, length(uv)); // rotation amount normalized over distance

uv += mul(rotz(((f - 0.5) / l) * smoothstep(-0.2, 0.4, _uv.y) * 0.45) , uv);

// flame thickness

float flame = 1.3 - length(uv.x) * 5.0;

// bottom of flame

float blueflame = pow(flame * .9, 15.0);

blueflame *= smoothstep(.2, -1.0, _uv.y);

blueflame /= abs(uv.x * 2.0);

blueflame = clamp(blueflame, 0.0, 1.0);

// flame

flame *= smoothstep(1., variationH * 0.5, _uv.y);

flame = clamp(flame, 0.0, 1.0);

flame = pow(flame, 3.);

flame /= smoothstep(1.1, -0.1, _uv.y);

// colors

float4 col = lerp(float4(1.0, 1.0, 0.0, 0.0), float4(1.0, 1.0, 0.6, 0.0), flame);

col = lerp(float4(1.0, .0, 0.0, 0.0), col, smoothstep(0.0, 1.6, flame));

float4 fragColor = col;

// a bit blueness on the bottom

float4 bluecolor = lerp(float4(0.0, 0.0, 1.0, 0.0), fragColor, 0.95);

fragColor = lerp(fragColor, bluecolor, blueflame);

// clear bg outside of the flame

fragColor *= flame;

fragColor.a = flame;

// bg halo

float haloSize = 0.5;

float centerL = 1.0 - (length(centerUV + float2(0.0, 0.1)) / haloSize);

float4 halo = float4(.8, .3, .3, 0.0) * 1.0 * fbm(float2(_Time.x * 0.035,0.0)) * centerL + 0.02;

float4 finalCol = lerp(halo, fragColor, fragColor.a);

fragColor = finalCol;

// just a hint of noise

fragColor *= lerp(rand(uv) + rand(uv * .45), 1.0, 0.9);

fragColor = clamp(fragColor, 0.0, 1.0);

return fragColor;

}

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

{

return mainImage(i.uv);

}

ENDCG

}

}

}

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作者：unity游侠

链接：https://blog.csdn.net/y90o08u28/article/details/107026311

来源：CSDN
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