@babylonjs/materials/sky/sky.fragment.js

Babylon.js Materials Library =====================

// Do not edit.
import { ShaderStore } from "@babylonjs/core/Engines/shaderStore.js";
import "@babylonjs/core/Shaders/ShadersInclude/clipPlaneFragmentDeclaration.js";
import "@babylonjs/core/Shaders/ShadersInclude/logDepthDeclaration.js";
import "@babylonjs/core/Shaders/ShadersInclude/fogFragmentDeclaration.js";
import "@babylonjs/core/Shaders/ShadersInclude/helperFunctions.js";
import "@babylonjs/core/Shaders/ShadersInclude/clipPlaneFragment.js";
import "@babylonjs/core/Shaders/ShadersInclude/logDepthFragment.js";
import "@babylonjs/core/Shaders/ShadersInclude/fogFragment.js";
import "@babylonjs/core/Shaders/ShadersInclude/imageProcessingCompatibility.js";
const name = "skyPixelShader";
const shader = `precision highp float;varying vec3 vPositionW;
#ifdef VERTEXCOLOR
varying vec4 vColor;
#endif
#include<clipPlaneFragmentDeclaration>
uniform vec3 cameraPosition;uniform vec3 cameraOffset;uniform vec3 up;uniform float luminance;uniform float turbidity;uniform float rayleigh;uniform float mieCoefficient;uniform float mieDirectionalG;uniform vec3 sunPosition;
#ifdef LOGARITHMICDEPTH
#extension GL_EXT_frag_depth : enable
#endif
#include<logDepthDeclaration>
#include<fogFragmentDeclaration>
const float e=2.71828182845904523536028747135266249775724709369995957;const float pi=3.141592653589793238462643383279502884197169;const float n=1.0003;const float N=2.545E25;const float pn=0.035;const vec3 lambda=vec3(680E-9,550E-9,450E-9);const vec3 K=vec3(0.686,0.678,0.666);const float v=4.0;const float rayleighZenithLength=8.4E3;const float mieZenithLength=1.25E3;const float EE=1000.0;const float sunAngularDiameterCos=0.999956676946448443553574619906976478926848692873900859324;const float cutoffAngle=pi/1.95;const float steepness=1.5;vec3 totalRayleigh(vec3 lambda)
{return (8.0*pow(pi,3.0)*pow(pow(n,2.0)-1.0,2.0)*(6.0+3.0*pn))/(3.0*N*pow(lambda,vec3(4.0))*(6.0-7.0*pn));}
vec3 simplifiedRayleigh()
{return 0.0005/vec3(94,40,18);}
float rayleighPhase(float cosTheta)
{ 
return (3.0/(16.0*pi))*(1.0+pow(cosTheta,2.0));}
vec3 totalMie(vec3 lambda,vec3 K,float T)
{float c=(0.2*T )*10E-18;return 0.434*c*pi*pow((2.0*pi)/lambda,vec3(v-2.0))*K;}
float hgPhase(float cosTheta,float g)
{return (1.0/(4.0*pi))*((1.0-pow(g,2.0))/pow(1.0-2.0*g*cosTheta+pow(g,2.0),1.5));}
float sunIntensity(float zenithAngleCos)
{return EE*max(0.0,1.0-exp((-(cutoffAngle-acos(zenithAngleCos))/steepness)));}
float A=0.15;float B=0.50;float C=0.10;float D=0.20;float EEE=0.02;float F=0.30;float W=1000.0;vec3 Uncharted2Tonemap(vec3 x)
{return ((x*(A*x+C*B)+D*EEE)/(x*(A*x+B)+D*F))-EEE/F;}
#if DITHER
#include<helperFunctions>
#endif
#define CUSTOM_FRAGMENT_DEFINITIONS
void main(void) {
#define CUSTOM_FRAGMENT_MAIN_BEGIN
#include<clipPlaneFragment>
/**
*--------------------------------------------------------------------------------------------------
* Sky Color
*--------------------------------------------------------------------------------------------------
*/
float sunfade=1.0-clamp(1.0-exp((sunPosition.y/450000.0)),0.0,1.0);float rayleighCoefficient=rayleigh-(1.0*(1.0-sunfade));vec3 sunDirection=normalize(sunPosition);float sunE=sunIntensity(dot(sunDirection,up));vec3 betaR=simplifiedRayleigh()*rayleighCoefficient;vec3 betaM=totalMie(lambda,K,turbidity)*mieCoefficient;float zenithAngle=acos(max(0.0,dot(up,normalize(vPositionW-cameraPosition+cameraOffset))));float sR=rayleighZenithLength/(cos(zenithAngle)+0.15*pow(93.885-((zenithAngle*180.0)/pi),-1.253));float sM=mieZenithLength/(cos(zenithAngle)+0.15*pow(93.885-((zenithAngle*180.0)/pi),-1.253));vec3 Fex=exp(-(betaR*sR+betaM*sM));float cosTheta=dot(normalize(vPositionW-cameraPosition),sunDirection);float rPhase=rayleighPhase(cosTheta*0.5+0.5);vec3 betaRTheta=betaR*rPhase;float mPhase=hgPhase(cosTheta,mieDirectionalG);vec3 betaMTheta=betaM*mPhase;vec3 Lin=pow(sunE*((betaRTheta+betaMTheta)/(betaR+betaM))*(1.0-Fex),vec3(1.5));Lin*=mix(vec3(1.0),pow(sunE*((betaRTheta+betaMTheta)/(betaR+betaM))*Fex,vec3(1.0/2.0)),clamp(pow(1.0-dot(up,sunDirection),5.0),0.0,1.0));vec3 direction=normalize(vPositionW-cameraPosition);float theta=acos(direction.y);float phi=atan(direction.z,direction.x);vec2 uv=vec2(phi,theta)/vec2(2.0*pi,pi)+vec2(0.5,0.0);vec3 L0=vec3(0.1)*Fex;float sundisk=smoothstep(sunAngularDiameterCos,sunAngularDiameterCos+0.00002,cosTheta);L0+=(sunE*19000.0*Fex)*sundisk;vec3 whiteScale=1.0/Uncharted2Tonemap(vec3(W));vec3 texColor=(Lin+L0);texColor*=0.04 ;texColor+=vec3(0.0,0.001,0.0025)*0.3;float g_fMaxLuminance=1.0;float fLumScaled=0.1/luminance; 
float fLumCompressed=(fLumScaled*(1.0+(fLumScaled/(g_fMaxLuminance*g_fMaxLuminance))))/(1.0+fLumScaled); 
float ExposureBias=fLumCompressed;vec3 curr=Uncharted2Tonemap((log2(2.0/pow(luminance,4.0)))*texColor);vec3 retColor=curr*whiteScale;/**
*--------------------------------------------------------------------------------------------------
* Sky Color
*--------------------------------------------------------------------------------------------------
*/
float alpha=1.0;
#ifdef VERTEXCOLOR
retColor.rgb*=vColor.rgb;
#endif
#if defined(VERTEXALPHA) || defined(INSTANCESCOLOR) && defined(INSTANCES)
alpha*=vColor.a;
#endif
#if DITHER
retColor.rgb+=dither(gl_FragCoord.xy,0.5);
#endif
vec4 color=clamp(vec4(retColor.rgb,alpha),0.0,1.0);
#include<logDepthFragment>
#include<fogFragment>
gl_FragColor=color;
#include<imageProcessingCompatibility>
#define CUSTOM_FRAGMENT_MAIN_END
}
`;
// Sideeffect
if (!ShaderStore.ShadersStore[name]) {
    ShaderStore.ShadersStore[name] = shader;
}
/** @internal */
export const skyPixelShader = { name, shader };
//# sourceMappingURL=sky.fragment.js.map