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Code Issues 156 Wiki Activity

Switch the fog over the sky to the fog without the clouds as soon as the volume holds any cloud

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Hirek
2026-10-17 19:31:45 +02:00
parent 56889679d9
commit df48637718
1 changed files with 6 additions and 3 deletions
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9
shaders/fog_volume.glsl
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@@ -54,8 +54,11 @@ vec4 fog_along_view(vec3 view, vec2 fragcoord)
return vec4(volume.rgb + volume.a * rest.rgb, volume.a * rest.a); return vec4(volume.rgb + volume.a * rest.rgb, volume.a * rest.a);
} }
// how fast the fog of the volume over the sky gives way to the fog without the clouds, per share of the light the clouds in it hold back // shares of the light the clouds in the volume hold back between which its fog over the sky gives way to the fog without the clouds.
const float FOG_SKY_CLOUD_CUT = 4.0; // low: the clouds of the volume (without the detail, so a little wider than those drawn) leave no light rim along their thin edges;
// the lower end above what the cells of the volume and the fog along the ray differ by on their own
const float FOG_SKY_CLOUD_LOW = 0.004;
const float FOG_SKY_CLOUD_HIGH = 0.03;
// fog in front of the sky in a view space direction: through the fog volume to its far end, then along the ray without the // fog in front of the sky in a view space direction: through the fog volume to its far end, then along the ray without the
// haze the atmosphere draws already. the far fog of the volume and the fog over the sky behind it are the same then // haze the atmosphere draws already. the far fog of the volume and the fog over the sky behind it are the same then
@@ -75,7 +78,7 @@ vec4 fog_sky(vec3 viewdirection, vec2 fragcoord)
if (weather_camera.z > 0.5) if (weather_camera.z > 0.5)
{ {
vec4 clear = fog_analytic(direction, 0.0, far, false); vec4 clear = fog_analytic(direction, 0.0, far, false);
float clouds = clamp((1.0 - volume.a / max(clear.a, 1e-4)) * FOG_SKY_CLOUD_CUT, 0.0, 1.0); float clouds = smoothstep(FOG_SKY_CLOUD_LOW, FOG_SKY_CLOUD_HIGH, 1.0 - volume.a / max(clear.a, 1e-4));
volume = mix(volume, clear, clouds); volume = mix(volume, clear, clouds);
} }
vec4 rest = fog_analytic(direction, far, 200000.0, true); vec4 rest = fog_analytic(direction, far, 200000.0, true);