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try to improve how VL fog goes away in caves/low light levels

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Xonk 2024-06-28 16:59:33 -04:00
parent 0ccec1e817
commit d5a92880ac
2 changed files with 36 additions and 22 deletions
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56
shaders/lib/overworld_fog.glsl
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@ -111,11 +111,9 @@ vec4 GetVolumetricFog(
/// ------------- COLOR/LIGHTING STUFF ------------- \\\
vec3 color = vec3(0.0);
float absorbance = 1.0;
float AtmosphereAbsorbance = 1.0;
float lightleakfix = 1.0 - caveDetection;
float lightleakfix2 = pow(clamp(eyeBrightnessSmooth.y/240. ,0.0,1.0),3.0);
float totalAbsorbance = 1.0;
float fogAbsorbance = 1.0;
float atmosphereAbsorbance = 1.0;
vec3 WsunVec = mat3(gbufferModelViewInverse) * sunVec;
float SdotV = dot(sunVec, normalize(viewPosition))*lightCol.a;
@ -172,6 +170,11 @@ vec4 GetVolumetricFog(
float TorchBrightness_autoAdjust = mix(1.0, 30.0, clamp(exp(-10.0*exposure),0.0,1.0)) / 5.0;
#endif
float inACave = 1.0 - caveDetection;
float lightLevelZero = pow(clamp(eyeBrightnessSmooth.y/240.0 ,0.0,1.0),3.0);
// SkyLightColor *= lightLevelZero*0.9 + 0.1;
for (int i = 0; i < SAMPLECOUNT; i++) {
float d = (pow(expFactor, float(i+dither.x)/float(SAMPLECOUNT))/expFactor - 1.0/expFactor)/(1-1.0/expFactor);
float dd = pow(expFactor, float(i+dither.x)/float(SAMPLECOUNT)) * log(expFactor) / float(SAMPLECOUNT)/(expFactor-1.0);
@ -179,7 +182,9 @@ vec4 GetVolumetricFog(
progress = start.xyz + d*dV;
progressW = gbufferModelViewInverse[3].xyz + cameraPosition + d*dVWorld;
//------------------------------------
//------ SAMPLE SHADOWS FOR FOG EFFECTS
//------------------------------------
#ifdef DISTORT_SHADOWMAP
float distortFactor = calcDistort(progress.xy);
#else
@ -212,12 +217,14 @@ vec4 GetVolumetricFog(
#ifdef PER_BIOME_ENVIRONMENT
float maxDistance = inBiome * min(max(1.0 - length(d*dVWorld.xz)/(32*8),0.0)*2.0,1.0);
float densityVol = cloudVol(progressW, maxDistance) * lightleakfix;
float densityVol = cloudVol(progressW, maxDistance) * inACave;
#else
float densityVol = cloudVol(progressW, 0.0) * lightleakfix;
float densityVol = cloudVol(progressW, 0.0) * inACave;
#endif
//------------------------------------
//------ MAIN FOG EFFECT
//------------------------------------
float fogDensity = densityVol;
float fogVolumeCoeff = exp(-fogDensity*dd*dL); // this is like beer-lambert law or something
@ -230,12 +237,16 @@ vec4 GetVolumetricFog(
#endif
vec3 Lightning = Iris_Lightningflash_VLfog(progressW-cameraPosition, lightningBoltPosition.xyz);
vec3 lighting = DirectLight * lightleakfix + indirectLight * lightleakfix2 + Lightning;
vec3 lighting = DirectLight + indirectLight * (lightLevelZero*0.99 + 0.01) + Lightning;
color += (lighting - lighting * fogVolumeCoeff) * absorbance;
absorbance *= fogVolumeCoeff;
color += (lighting - lighting * fogVolumeCoeff) * fogAbsorbance;
fogAbsorbance *= fogVolumeCoeff;
// kill fog absorbance when in caves.
totalAbsorbance *= mix(1.0, fogVolumeCoeff, lightLevelZero);
//------------------------------------
//------ ATMOSPHERE HAZE EFFECT
//------------------------------------
#if defined CloudLayer0 && defined VOLUMETRIC_CLOUDS
float cloudPlaneCutoff = clamp((CloudLayer0_height + max(eyeAltitude-(CloudLayer0_height-100),0)) - progressW.y,0.0,1.0);
#else
@ -252,15 +263,18 @@ vec4 GetVolumetricFog(
// calculate the atmosphere haze seperately and purely additive to color, do not contribute to absorbtion.
vec3 atmosphereVolumeCoeff = exp(-(rL+m)*dd*dL_alternate);
vec3 Atmosphere = (LightSourcePhased * sh * (rayL*rL + sunPhase*m) + AveragedAmbientColor * (rL+m)) * lightleakfix2;
color += (Atmosphere - Atmosphere * atmosphereVolumeCoeff) / (rL+m+1e-6) * AtmosphereAbsorbance * absorbance;
AtmosphereAbsorbance *= dot(atmosphereVolumeCoeff, vec3(0.33333));
vec3 Atmosphere = (LightSourcePhased * sh * (rayL*rL + sunPhase*m) + AveragedAmbientColor * (rL+m) * (lightLevelZero*0.99 + 0.01)) * inACave;
color += (Atmosphere - Atmosphere * atmosphereVolumeCoeff) / (rL+m+1e-6) * atmosphereAbsorbance * totalAbsorbance;
atmosphereAbsorbance *= dot(atmosphereVolumeCoeff, vec3(0.33333));
//------------------------------------
//------ LPV FOG EFFECT
//------------------------------------
#if defined LPV_VL_FOG_ILLUMINATION && defined EXCLUDE_WRITE_TO_LUT
color += LPV_FOG_ILLUMINATION(progressW-cameraPosition, dd, dL) * TorchBrightness_autoAdjust * absorbance;
color += LPV_FOG_ILLUMINATION(progressW-cameraPosition, dd, dL) * TorchBrightness_autoAdjust * totalAbsorbance;
#endif
//------------------------------------
//------ STUPID RENDER CLOUDS AS FOG EFFECT
//------------------------------------
#ifdef RAYMARCH_CLOUDS_WITH_FOG
float otherlayer = max(progressW.y - (CloudLayer0_height+99.5), 0.0) > 0.0 ? 0.0 : 1.0;
@ -313,15 +327,15 @@ vec4 GetVolumetricFog(
float distantfade = 1- exp( -10*pow(clamp(1.0 - length(progressW - cameraPosition)/(32*65),0.0,1.0),2));
vec3 cloudlighting = DoCloudLighting(DUAL_DENSITY * cumulus, SkyLightColor*skylightOcclusion, skyScatter, directLight, directScattering*sh_forClouds, directMultiScattering*sh_forClouds, 1);
color += max(cloudlighting - cloudlighting*exp(-muE*dd*dL_alternate),0.0) * absorbance;
absorbance *= max(exp(-muE*dd*dL_alternate),0.0);
color += max(cloudlighting - cloudlighting*exp(-muE*dd*dL_alternate),0.0) * totalAbsorbance * lightLevelZero;
totalAbsorbance *= max(exp(-muE*dd*dL_alternate),1.0-lightLevelZero);
}
}
#else
if (absorbance < 1e-5) break;
if (totalAbsorbance < 1e-5) break;
#endif
}
return vec4(color, absorbance);
return vec4(color, totalAbsorbance);
}

2
shaders/lib/settings.glsl
View File

@ -1,4 +1,4 @@
#define SHADER_VERSION_LABEL 474 // [474]
#define SHADER_VERSION_LABEL 475 // [475]
#define saturate(x) clamp(x,0.0,1.0)