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Unity3D | Lightning Shader
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//Code is converted to use in Unity(ShaderLab) from | |
//Lightining by asti | |
//on Shadertoy(https://www.shadertoy.com/view/Xds3Rj) | |
Shader "Custom/Lightning" | |
{ | |
Properties | |
{ | |
_MainTex ("Texture", 2D) = "white" {} | |
} | |
SubShader | |
{ | |
Tags { "RenderType"="Opaque" } | |
LOD 100 | |
Pass | |
{ | |
CGPROGRAM | |
#pragma vertex vert | |
#pragma fragment frag | |
#include "UnityCG.cginc" | |
#define LIGHTNING_PARTS 10 | |
struct appdata | |
{ | |
float4 vertex : POSITION; | |
float2 uv : TEXCOORD0; | |
}; | |
struct v2f | |
{ | |
float2 uv : TEXCOORD0; | |
float4 vertex : SV_POSITION; | |
}; | |
sampler2D _MainTex; | |
float4 _MainTex_ST; | |
v2f vert (appdata v) | |
{ | |
v2f o; | |
o.vertex = UnityObjectToClipPos(v.vertex); | |
o.uv = v.uv; | |
return o; | |
} | |
float hash(in float x) | |
{ | |
return frac(21654.6512 * sin(385.51 * x)); | |
} | |
float hash(float2 p) | |
{ | |
return frac(21654.65155 * sin(35.51 * p.x + 45.51 * p.y)); | |
} | |
float lhash(float x, float y) | |
{ | |
float h = 0.0; | |
[unroll(5)]for (int i = 0; i < 5; i++) | |
{ | |
h += (frac(21654.65155 * float(i) * sin(35.51 * x + 45.51 * float(i) * y * (5.0 / float(i))))* 2.0 - 1.0) / 10.0; | |
} | |
return h / 5.0 + 0.02; | |
} | |
float noise(in float2 p) | |
{ | |
float2 fl = floor(p); | |
float2 fr = frac(p); | |
fr.x = smoothstep(0.0, 1.0, fr.x); | |
fr.y = smoothstep(0.0, 1.0, fr.y); | |
float a = lerp(hash(fl + float2(0.0, 0.0)), hash(fl + float2(1.0, 0.0)), fr.x); | |
float b = lerp(hash(fl + float2(0.0, 1.0)), hash(fl + float2(1.0, 1.0)), fr.x); | |
return lerp(a, b, fr.y); | |
} | |
float distanceToSegment(float2 a, float2 b, float2 p) | |
{ | |
float2 pa = p - a; | |
float2 ba = b - a; | |
float h = clamp(dot(pa, ba) / dot(ba, ba), 0.0, 1.0); | |
return length(pa - ba*h); | |
} | |
float lightning2(float2 ls, float2 le, float intensity, float2 uv) | |
{ | |
float f = 1.0; | |
[unroll(10)]for (int i = 0; i < LIGHTNING_PARTS; i++) | |
{ | |
float2 ltemp1 = lerp(ls, le, float(i) / float(LIGHTNING_PARTS)); | |
float2 ltemp2 = lerp(ls, le, float(i + 1) / float(LIGHTNING_PARTS)); | |
float h3 = frac(21654.65155 * sin(35.51 * ls.x)); | |
float lh1 = lhash(ltemp1.y, _Time.y); | |
float lh2 = lhash(ltemp2.y, _Time.y); | |
ltemp1.x += lh1; | |
ltemp2.x += lh2; | |
if (i == 0) { | |
f = min(f, distanceToSegment(ls, ltemp2, uv)); | |
} | |
//else if(i == LIGHTNING_PARTS - 1) | |
//f = min(f,distanceToSegment(ltemp1, le, uv )); | |
else { | |
f = min(f, distanceToSegment(ltemp1, ltemp2, uv)); | |
} | |
//if(abs(h3) > 0.07 && intensity > 0.1) | |
//f = min(f,lightning(ltemp1, vec2(mix(ltemp1, le, 0.5) + vec2(lh1 * 3.0 - h3 * 5.0,h3 * 5.0)),intensity * 0.5,uv)); | |
// f = min(f,distanceToSegment(ltemp1, vec2(mix(ltemp1, le, 0.5) + vec2(lh1 * 3.0 - h3 * 5.0,h3 * 5.0)),uv)); | |
} | |
return f; | |
} | |
float lightning(float2 ls, float2 le, float intensity, float2 uv) | |
{ | |
float f = 1.0; | |
for (int i = 0; i < LIGHTNING_PARTS; i++) | |
{ | |
float2 ltemp1 = lerp(ls, le, float(i) / float(LIGHTNING_PARTS)); | |
float2 ltemp2 = lerp(ls, le, float(i + 1) / float(LIGHTNING_PARTS)); | |
float h3 = frac(22654.65155 * ls.x * sin(3542.51 * ltemp1.y * le.y)) - sqrt(ltemp1.y) + 0.6; | |
float lh1 = lhash(ltemp1.y + ltemp1.x, _Time.y); | |
float lh2 = lhash(ltemp2.y + ltemp2.x, _Time.y); | |
ltemp1.x += lh1; | |
ltemp2.x += lh2; | |
if (i == 0) | |
f = min(f, distanceToSegment(ls, ltemp2, uv)); | |
else | |
f = min(f, distanceToSegment(ltemp1, ltemp2, uv)); | |
if (h3 > 0.9) | |
f = min(f, sqrt(float(i + 2)) * lightning2(ltemp1, float2(le.x + ltemp1.y + sqrt(h3) - 1.0 + lh1 * 7.0, le.y), intensity * 0.5, uv)); | |
} | |
return f; | |
} | |
fixed4 frag (v2f i) : SV_Target | |
{ | |
//vec2 uv = fragCoord.xy / iResolution.xy; | |
float2 uv = i.uv; | |
uv = uv*2.0 - 1.0; | |
uv.x *= _ScreenParams.x / _ScreenParams.y; | |
float3 col = float3(0.0, 0.0, 0.0); | |
float2 ls = float2(0.0, 1.01); | |
float2 le = float2(0.0, -1.0); | |
float f = 1.0; | |
[unroll(10)]for (int i = 0; i < 10; i++) | |
{ | |
//Lightning Seeds | |
float h = hash(float2(sqrt(float(i)), floor((_Time.y) * 7.0 + (float(i) / 10.0)) * float(i))); | |
ls.x = hash(h) * 3.0 - fmod(_Time.y, 3.0); | |
le.x = ls.x + sqrt(hash(sqrt(h + i))) -0.5; | |
if (h > 0.96) { | |
f = min(f, lightning(ls, le, 1.0, uv)); | |
} | |
} | |
col = lerp(col, float3(0.2, 0.0, 0.9), 1.0 - smoothstep(0.0, 0.5, pow(f / 2.0, 0.5) - uv.y / 40.0)); | |
// glow effect | |
col = lerp(col, float3(0.9, 0.9, 0.9), 1.0 - smoothstep(0.0, 0.2, pow(f / 2.0, 0.5) - uv.y / 40.0)); | |
fixed4 color = fixed4(col, 1.0); | |
return color; | |
} | |
ENDCG | |
} | |
} | |
} |
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