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Enhance god rays effect with occlusion-based transmittance calculation

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This commit is contained in:
Victor Giers
2026-04-28 05:14:49 +02:00
parent 15175155aa
commit 1554c702c4
1 changed files with 11 additions and 6 deletions
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17
src/rendering/screen-space-god-rays.ts
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@@ -27,8 +27,8 @@ const MAX_GOD_RAYS_EXPOSURE = 2;
const MAX_GOD_RAYS_DENSITY = 1.5;
const MIN_GOD_RAYS_SAMPLES = 8;
const MAX_GOD_RAYS_SAMPLES = 64;
const LIGHT_OFFSCREEN_FADE_START = 0.98;
const LIGHT_OFFSCREEN_FADE_END = 1.12;
const LIGHT_OFFSCREEN_FADE_START = 0.92;
const LIGHT_OFFSCREEN_FADE_END = 1;
export interface ResolvedGodRaysParameters {
enabled: boolean;
@@ -301,9 +301,9 @@ float getSunSourceMask(const in vec2 sampleUv) {
vec2 safeResolution = max(resolution, vec2(1.0));
vec2 aspectScale = vec2(safeResolution.x / safeResolution.y, 1.0);
float sourceDistance = length((sampleUv - lightPosition) * aspectScale);
float core = 1.0 - smoothstep(0.015, 0.085, sourceDistance);
float halo = 1.0 - smoothstep(0.04, 0.42, sourceDistance);
return clamp(core * 1.35 + halo * 0.42, 0.0, 1.0);
float core = 1.0 - smoothstep(0.01, 0.05, sourceDistance);
float halo = 1.0 - smoothstep(0.035, 0.2, sourceDistance);
return clamp(core * 1.25 + halo * 0.32, 0.0, 1.0);
}
void main() {
@@ -324,6 +324,7 @@ void main() {
vec2 sampleUv = vUv;
vec3 accumulatedLight = vec3(0.0);
float illuminationDecay = 1.0;
float transmittance = 1.0;
for (int sampleIndex = 0; sampleIndex < MAX_GOD_RAYS_SAMPLES; ++sampleIndex) {
if (sampleIndex >= sampleCount) {
@@ -344,9 +345,12 @@ void main() {
float depth = readDepth(sampleUv);
float backgroundMask = smoothstep(0.9975, 1.0, depth);
float occluderMask = 1.0 - backgroundMask;
float sourceMask = getSunSourceMask(sampleUv);
if (backgroundMask <= 0.0 || sourceMask <= 0.0) {
transmittance *= mix(1.0, 0.58, occluderMask);
if (backgroundMask <= 0.0 || sourceMask <= 0.0 || transmittance <= 0.02) {
illuminationDecay *= decay;
continue;
}
@@ -358,6 +362,7 @@ void main() {
backgroundMask *
sourceMask *
(0.22 + brightness * 0.78) *
transmittance *
illuminationDecay;
accumulatedLight += mix(lightColor, sampleColor, 0.28) * contribution;
illuminationDecay *= decay;