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https://github.com/X0nk/Bliss-Shader.git
synced 2025-06-27 02:32:39 +08:00
allow volumetric fog to intersect volumetric clouds
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Xonk
@ -237,18 +237,21 @@ vec4 raymarchCloud(
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float distanceFade,
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float referenceDistance,
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vec3 sampledSkyCol
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vec3 sampledSkyCol,
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inout vec2 cloudPlaneDistance
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){
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vec3 color = vec3(0.0);
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float totalAbsorbance = 1.0;
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float GetPos = 0.0;
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float planetShadow = getPlanetShadow(rayPosition, sunVector);
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sunScattering *= planetShadow;
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sunMultiScattering *= planetShadow;
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float distanceFactor = length(rayDirection);
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if(LayerIndex == ALTOSTRATUS_LAYER){
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float density = dailyWeatherParams1.z;
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@ -267,6 +270,9 @@ vec4 raymarchCloud(
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// check if the pixel has visible clouds before doing work.
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if(shapeWithDensity > 1e-5){
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cloudPlaneDistance.x = length(rayPosition - cameraPosition); cloudPlaneDistance.y = 0.0;
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// can add the initial cloud shape sample for a free shadow starting step :D
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float sunShadowMask = (shapeWithDensity + getCloudScattering(LayerIndex, rayPosition, sunVector, dither, minHeight, maxHeight, density)) * (1.0-abs(WsunVec.y));
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float indirectShadowMask = 0.5;
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@ -290,6 +296,8 @@ vec4 raymarchCloud(
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}
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if(LayerIndex < ALTOSTRATUS_LAYER){
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float density = dailyWeatherParams1.x;
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if(LayerIndex == LARGECUMULUS_LAYER) density = dailyWeatherParams1.y;
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@ -304,8 +312,10 @@ vec4 raymarchCloud(
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skylightOcclusion = mix(1.0, skylightOcclusion, distanceFade);
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#endif
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for(int i = 0; i < int(samples); i++) {
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// check if the ray staring position is going farther than the reference distance, if yes, dont begin marching. this is to check for intersections with the world.
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#ifndef VL_CLOUDS_DEFERRED
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if(length(rayPosition - cameraPosition) > referenceDistance) break;
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@ -318,8 +328,12 @@ vec4 raymarchCloud(
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float shapeWithDensity = shape*density;
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float shapeWithDensityFaded = shape*density * pow(clamp((rayPosition.y - minHeight)/(max(maxHeight-minHeight,1.0)*0.25),0.0,1.0),2.0);
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// check if the pixel has visible clouds before doing work.
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if(shapeWithDensityFaded > 1e-5){
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cloudPlaneDistance.x = length(rayPosition - cameraPosition); cloudPlaneDistance.y = 0.0;
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// can add the initial cloud shape sample for a free shadow starting step :D
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float indirectShadowMask = 1.0 - min(max(rayPosition.y - minHeight,0.0) / max(maxHeight-minHeight,1.0), 1.0);
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float sunShadowMask = shapeWithDensity + getCloudScattering(LayerIndex, rayPosition, sunVector, dither, minHeight, maxHeight, density);
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@ -339,7 +353,7 @@ vec4 raymarchCloud(
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#endif
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vec3 lighting = getCloudLighting(shapeWithDensity, shapeWithDensityFaded, sunShadowMask, sunScattering, sunMultiScattering, indirectShadowMask, skyScattering * skylightOcclusion, distanceFade);
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vec3 newPos = rayPosition - cameraPosition;
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newPos.xz /= max(newPos.y,0.0)*0.0025 + 1.0;
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newPos.y = min(newPos.y,0.0);
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@ -347,7 +361,6 @@ vec4 raymarchCloud(
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float distancefog = exp(-0.00025*length(newPos));
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vec3 atmosphereHaze = (sampledSkyCol - sampledSkyCol * distancefog);
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lighting = lighting * distancefog + atmosphereHaze;
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float densityCoeff = exp(-distanceFactor*shapeWithDensityFaded);
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color += (lighting - lighting * densityCoeff) * totalAbsorbance;
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@ -355,11 +368,15 @@ vec4 raymarchCloud(
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// check if you can see through the cloud on the pixel before doing the next iteration
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if (totalAbsorbance < 1e-5) break;
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}
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}
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rayPosition += rayDirection;
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}
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return vec4(color, totalAbsorbance);
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}
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@ -391,7 +408,9 @@ vec4 GetVolumetricClouds(
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vec2 dither,
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vec3 sunVector,
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vec3 directLightCol,
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vec3 indirectLightCol
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vec3 indirectLightCol,
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inout float cloudPlaneDistance
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){
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#ifndef VOLUMETRIC_CLOUDS
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return vec4(0.0,0.0,0.0,1.0);
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@ -438,6 +457,20 @@ vec4 GetVolumetricClouds(
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vec3 rayDirection = NormPlayerPos.xyz * (cloudheight/length(NormPlayerPos.xyz/cloudDist)/samples);
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vec3 rayPosition = getRayOrigin(rayDirection, cameraPosition, dither.y, minHeight, maxHeight);
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// setup for getting distance
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vec3 playerPos = mat3(gbufferModelViewInverse) * viewPos;
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#ifdef DISTANT_HORIZONS
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float maxLength = min(length(playerPos), max(far, dhRenderDistance))/length(playerPos);
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#else
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float maxLength = min(length(playerPos), far)/length(playerPos);
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#endif
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playerPos *= maxLength;
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float startDistance = length(playerPos);
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///------- do color stuff outside of the raymarcher loop
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vec3 sunScattering = directLightCol * (phaseCloud(SdotV, 0.85) + phaseCloud(SdotV, 0.75)) * 3.14;
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vec3 sunMultiScattering = directLightCol * 0.8;// * (phaseCloud(SdotV, 0.35) + phaseCloud(-SdotV, 0.35) * 0.5) * 6.28;
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@ -468,8 +501,9 @@ vec4 GetVolumetricClouds(
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////------- RENDER SMALL CUMULUS CLOUDS
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vec4 smallCumulusClouds = cloudColor;
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vec2 cloudLayer0_Distance = vec2(startDistance, 1.0);
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#ifdef CloudLayer0
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smallCumulusClouds = raymarchCloud(SMALLCUMULUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM, sampledSkyCol);
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smallCumulusClouds = raymarchCloud(SMALLCUMULUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM, sampledSkyCol, cloudLayer0_Distance);
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#endif
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////------- RENDER LARGE CUMULUS CLOUDS
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@ -484,7 +518,8 @@ vec4 GetVolumetricClouds(
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rayDirection = NormPlayerPos.xyz * (cloudheight/length(NormPlayerPos.xyz/cloudDist)/samples);
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rayPosition = getRayOrigin(rayDirection, cameraPosition, dither.y, minHeight, maxHeight);
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if(smallCumulusClouds.a > 1e-5) largeCumulusClouds = raymarchCloud(LARGECUMULUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM, sampledSkyCol);
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vec2 cloudLayer1_Distance = vec2(startDistance, 1.0);
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if(smallCumulusClouds.a > 1e-5) largeCumulusClouds = raymarchCloud(LARGECUMULUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM, sampledSkyCol, cloudLayer1_Distance);
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#endif
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////------- RENDER ALTOSTRATUS CLOUDS
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@ -499,11 +534,25 @@ vec4 GetVolumetricClouds(
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rayDirection = NormPlayerPos.xyz * (cloudheight/length(NormPlayerPos.xyz/cloudDist));
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rayPosition = getRayOrigin(rayDirection, cameraPosition, dither.y, minHeight, maxHeight);
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if(smallCumulusClouds.a > 1e-5 || largeCumulusClouds.a > 1e-5) altoStratusClouds = raymarchCloud(ALTOSTRATUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM, sampledSkyCol);
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vec2 cloudLayer2_Distance = vec2(startDistance, 1.0);
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if(smallCumulusClouds.a > 1e-5 || largeCumulusClouds.a > 1e-5) altoStratusClouds = raymarchCloud(ALTOSTRATUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM, sampledSkyCol, cloudLayer2_Distance);
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#endif
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////------- BLEND LAYERS
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#if defined CloudLayer0 && !defined CloudLayer1 && !defined CloudLayer2
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cloudPlaneDistance = cloudLayer1_Distance.x;
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#endif
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#if defined CloudLayer0 && defined CloudLayer1 && !defined CloudLayer2
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cloudPlaneDistance = mix(cloudLayer0_Distance.x, cloudLayer1_Distance.x, cloudLayer0_Distance.y);
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#endif
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#if defined CloudLayer0 && defined CloudLayer1 && defined CloudLayer2
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cloudPlaneDistance = mix(cloudLayer2_Distance.x, cloudLayer1_Distance.x, cloudLayer2_Distance.y);
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cloudPlaneDistance = mix(cloudLayer0_Distance.x, cloudPlaneDistance, cloudLayer0_Distance.y);
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#endif
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#ifdef CloudLayer2
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cloudColor = altoStratusClouds;
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#endif
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@ -511,6 +560,8 @@ vec4 GetVolumetricClouds(
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cloudColor.rgb *= largeCumulusClouds.a;
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cloudColor.rgb += largeCumulusClouds.rgb;
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cloudColor.a *= largeCumulusClouds.a;
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#endif
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#ifdef CloudLayer0
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cloudColor.rgb *= smallCumulusClouds.a;
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