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Code Issues 151 Wiki Activity

Take the light of a lamp in the fog along four rays in the cells next to it

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Hirek
2026-10-17 00:31:59 +02:00
parent f1c12ca651
commit d07204db5c
1 changed files with 24 additions and 1 deletions
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25
shaders/fog_inject.comp
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@@ -149,6 +149,7 @@ vec3 lamp_light(light_s light, vec3 position)
// that far behind the lamp. the point sampled moves within the cell from frame to frame, and the ray of the cell would pass at
// almost no distance from the lamp in one frame and a cell away in the next, above the tip of the cone and below it. Part:
// where between the two halves of the segment the points are (0-1)
vec3 lamp_segment(light_s lamp, light_s cone, vec3 start, vec3 direction, float span, float width, float part);
vec3 lamp_scattering(light_s lamp, vec3 start, vec3 direction, float span, float cellwidth, float part)
{
vec3 sum = vec3(0.0);
@@ -165,10 +166,32 @@ vec3 lamp_scattering(light_s lamp, vec3 start, vec3 direction, float span, float
float closest = dot(lamp.pos - start, direction);
vec3 nearest = start + direction * closest;
float width = max(cellwidth * max(-nearest.z, 0.0), 1e-3);
float reach = sqrt(dot(lamp.pos - nearest, lamp.pos - nearest) + width * width);
light_s cone = lamp;
if (lamp.type == LIGHT_SPOT)
cone.pos -= normalize(lamp.dir) * width;
if (dot(lamp.pos - nearest, lamp.pos - nearest) < 9.0 * width * width)
{
// a lamp within a few cells of the ray: the light of the cell is taken along four rays spread over the cell, so it
// doesn't depend on which side of the lamp the ray of this frame passes
vec3 across = normalize(cross(direction, vec3(0.0, 1.0, 0.0) + vec3(1e-4, 0.0, 0.0)));
vec3 up = cross(across, direction);
for (int k = 0; k < 4; k++)
{
vec2 shift = (vec2(float(k & 1), float(k >> 1)) - 0.5) * 0.5 * width;
sum += lamp_segment(lamp, cone, start + across * shift.x + up * shift.y, direction, span, width, part);
}
return sum * 0.25;
}
return lamp_segment(lamp, cone, start, direction, span, width, part);
}
// lamp_scattering() along one ray: Cone the lamp with the tip of its cone moved behind it, Width the width of the cell at the lamp
vec3 lamp_segment(light_s lamp, light_s cone, vec3 start, vec3 direction, float span, float width, float part)
{
vec3 sum = vec3(0.0);
float closest = dot(lamp.pos - start, direction);
vec3 nearest = start + direction * closest;
float reach = sqrt(dot(lamp.pos - nearest, lamp.pos - nearest) + width * width);
float first = atan(-closest, reach);
float last = atan(span - closest, reach);
for (int i = 0; i < 2; i++)