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Tune WebGL book bounce lighting

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Georg Tomitsch
2026-06-06 10:41:00 +02:00
parent 0956d2ef1f
commit 965be72ea4
1 changed files with 13 additions and 10 deletions
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public/js/webgl-book-lab.js
+13 -10
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@@ -547,17 +547,20 @@ function configureBookShadowReceiver(material, strength) {
return clamp(max(max(shadow0, shadow1), shadow2), 0.0, 1.0);
}
vec3 bookLocalBounce(vec3 worldPosition, vec3 worldNormal, float shadow) {
vec3 bookLocalBounce(vec3 worldPosition, vec3 worldNormal, float shadow, vec3 albedo) {
float tableDistance = max(0.0, worldPosition.y - bookTableTopY);
float tableReach = 1.0 - smoothstep(0.02, 0.24, tableDistance);
float tableReach = 1.0 - smoothstep(0.0, 0.34, tableDistance);
float sideReach = 1.0 - smoothstep(0.02, 0.62, tableDistance);
float grazingSide = 1.0 - pow(abs(worldNormal.y), 0.65);
float underside = smoothstep(0.12, 0.82, -worldNormal.y);
float pageGlow = smoothstep(0.02, 0.18, worldPosition.y - bookTableTopY) *
(1.0 - smoothstep(0.18, 0.34, worldPosition.y - bookTableTopY));
float bounce = tableReach * (0.42 + grazingSide * 0.34 + underside * 0.32) + pageGlow * 0.16;
vec3 tableWarmth = vec3(0.055, 0.029, 0.014);
vec3 pageWarmth = vec3(0.03, 0.021, 0.012);
return (tableWarmth * bounce + pageWarmth * pageGlow) * mix(1.0, 0.62, shadow);
float underside = smoothstep(0.16, 0.88, -worldNormal.y);
float sideFill = grazingSide * sideReach;
float tableFill = tableReach * (0.22 + underside * 0.24);
float pageFill = smoothstep(0.02, 0.2, tableDistance) * (1.0 - smoothstep(0.24, 0.72, tableDistance));
vec3 tableWarmth = vec3(0.08, 0.045, 0.024) * tableFill;
vec3 roomWarmth = vec3(0.045, 0.033, 0.024) * sideFill;
vec3 pageWarmth = vec3(0.05, 0.041, 0.029) * pageFill * grazingSide;
vec3 indirect = tableWarmth + roomWarmth + pageWarmth;
return albedo * indirect * mix(1.0, 0.72, shadow);
}
float spineClothThread(float coordinate, float frequency, float sharpness) {
@@ -606,7 +609,7 @@ function configureBookShadowReceiver(material, strength) {
${isHeadband ? 'outgoingLight = headbandCreviceLight(vBookSurfaceUv, outgoingLight);' : ''}
float bookReceiverShadow = bookReceiverShadowField(vBookReceiverWorldPosition) * bookShadowReceiverStrength;
outgoingLight *= mix(vec3(1.0), ${isHeadband ? 'vec3(0.16, 0.095, 0.055)' : 'vec3(0.38, 0.29, 0.2)'}, bookReceiverShadow);
outgoingLight += bookLocalBounce(vBookReceiverWorldPosition, normalize(vBookReceiverWorldNormal), bookReceiverShadow);
outgoingLight += bookLocalBounce(vBookReceiverWorldPosition, normalize(vBookReceiverWorldNormal), bookReceiverShadow, diffuseColor.rgb);
#include <opaque_fragment>`
);
};