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Code Issues 150 Wiki Activity

Give the volumetric clouds lumps, sky and ground light and a fog colour by the angle from the sun

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Hirek
2026-10-16 22:25:11 +02:00
parent 2be85410ce
commit 8b929fc1da
5 changed files with 68 additions and 21 deletions
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10
shaders/weather_common.glsl
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@@ -98,11 +98,13 @@ vec2 fog_optical_depth(float origin, float up, float near, float far, float haze
vec3 fog_color_world(vec3 direction)
{
vec3 sun = weather_sun_direction.xyz;
vec2 flat_view = direction.xz;
vec2 flat_sun = sun.xz;
// the light of the haze goes with the angle from the sun, not with the azimuth alone: the table is taken at the point of the
// horizon as far from the sun as the view is. level views get the colour of their azimuth as before; a view high up over the
// sun no longer gets the glow of the horizon under it (a column of light standing over a low sun)
float sunflat = length(sun.xz);
float cosangle = 1.0;
if (dot(flat_view, flat_view) > 1e-8 && dot(flat_sun, flat_sun) > 1e-8)
cosangle = dot(normalize(flat_view), normalize(flat_sun));
if (sunflat > 1e-4)
cosangle = clamp(dot(normalize(direction), sun) / sunflat, -1.0, 1.0);
float position = acos(clamp(cosangle, -1.0, 1.0)) / WEATHER_PI * float(FOG_HORIZON_SAMPLES - 1);
int index = int(floor(position));
vec3 color = mix(fog_horizon[clamp(index, 0, FOG_HORIZON_SAMPLES - 1)].rgb, fog_horizon[clamp(index + 1, 0, FOG_HORIZON_SAMPLES - 1)].rgb, fract(position));