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[WIP] Implement advanced rendering features: skin SSS, eye shader, and hair shader with SDK/demo controls #6

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Merged
hmthanh merged 3 commits into from
Mar 22, 2026
Merged

[WIP] Implement advanced rendering features: skin SSS, eye shader, and hair shader with SDK/demo controls #6

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Copilot Mar 22, 2026
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Copilot Mar 22, 2026
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feat: continue PR4 with deferred SSS integration, SDK controls, and d…
Copilot Mar 22, 2026
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178 changes: 175 additions & 3 deletions demo/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -242,6 +242,58 @@ <h1>OpenHuman Engine</h1>
<label>Pipeline</label>
<button class="toggle-btn" id="btn-pipeline" style="min-width:68px;">Deferred</button>
</div>

<div class="section-title" style="margin-top:6px;">Advanced Shading</div>

<div class="ctrl-row">
<label>Skin SSS</label>
<button class="toggle-btn off" id="btn-sss">OFF</button>
</div>
<div class="ctrl-row">
<label>SSS Strength</label>
<input type="range" id="sss-strength" min="0.0" max="1.0" step="0.02" value="0.45" />
<span id="sss-strength-val">0.45</span>
</div>
<div class="ctrl-row">
<label>SSS Width</label>
<input type="range" id="sss-width" min="0.5" max="5.0" step="0.1" value="2.0" />
<span id="sss-width-val">2.0</span>
</div>
<div class="ctrl-row">
<label>SSS Color R</label>
<input type="range" id="sss-r" min="0.0" max="2.0" step="0.05" value="1.0" />
<span id="sss-r-val">1.00</span>
</div>
<div class="ctrl-row">
<label>SSS Color G</label>
<input type="range" id="sss-g" min="0.0" max="2.0" step="0.05" value="0.45" />
<span id="sss-g-val">0.45</span>
</div>
<div class="ctrl-row">
<label>SSS Color B</label>
<input type="range" id="sss-b" min="0.0" max="2.0" step="0.05" value="0.18" />
<span id="sss-b-val">0.18</span>
</div>

<div class="ctrl-row">
<label>Eye Shader</label>
<button class="toggle-btn" id="btn-eye">ON</button>
</div>
<div class="ctrl-row">
<label>Iris Size</label>
<input type="range" id="eye-iris" min="0.12" max="0.45" step="0.01" value="0.30" />
<span id="eye-iris-val">0.30</span>
</div>

<div class="ctrl-row">
<label>Hair Shader</label>
<button class="toggle-btn" id="btn-hair">ON</button>
</div>
<div class="ctrl-row">
<label>Hair Aniso</label>
<input type="range" id="hair-spec" min="16" max="128" step="1" value="80" />
<span id="hair-spec-val">80</span>
</div>
</div>

<!-- Animation controls (bottom-centre) -->
Expand Down Expand Up @@ -277,6 +329,7 @@ <h1>OpenHuman Engine</h1>
import {
GLContext, StateCache,
ForwardRenderer, DeferredRenderer, ShadowMap,
EyeRenderer, HairRenderer, buildHairCards,
Camera, Light, Node,
VertexBuffer, IndexBuffer,
Skeleton, Joint,
Expand Down Expand Up @@ -477,6 +530,8 @@ <h1>OpenHuman Engine</h1>
const deferredRenderer = new DeferredRenderer(glCtx, cache);
const forwardRenderer = new ForwardRenderer(glCtx, cache);
const shadowMap = new ShadowMap(glCtx, cache);
const eyeRenderer = new EyeRenderer(glCtx, cache);
const hairRenderer = new HairRenderer(glCtx, cache);

// Active renderer pointer — starts on deferred path
let renderer = deferredRenderer;
Expand All @@ -486,6 +541,9 @@ <h1>OpenHuman Engine</h1>
let shadowEnabled = true;
let iblEnabled = false;
let acesEnabled = true;
let sssEnabled = false;
let eyeEnabled = true;
let hairEnabled = true;

const camera = new Camera({ fov: 50, aspect: canvas.clientWidth / (canvas.clientHeight || 1), near: 0.1, far: 100 });
camera.setOrbit(0.2, Math.PI / 3.5, 3.5);
Expand All @@ -507,6 +565,28 @@ <h1>OpenHuman Engine</h1>
charNode.addChild(meshNode);
charNode.position.set(0, -1, 0);

// Additional demo meshes for PR#4
const skinNode = new Node('skinSphere');
skinNode.mesh = { ...meshData };
skinNode.position.set(-0.75, 0.05, -0.15);
skinNode.scale.set(0.62, 0.62, 0.62);
skinNode.mesh.material = {
baseColorFactor: [0.92, 0.62, 0.50, 1.0],
roughnessFactor: 0.58,
metallicFactor: 0.02,
};

const eyeNode = new Node('eye');
eyeNode.mesh = { vao: true }; // marker mesh for eye renderer pass
eyeNode.position.set(0.22, 0.15, 0.16);
eyeNode.scale.set(0.24, 0.24, 0.24);

const hairNode = new Node('hairCards');
hairNode.mesh = buildHairCards(gl, { cardCount: 48, cardLength: 0.95, cardWidth: 0.06 });
hairNode.position.set(0.0, 0.48, 0.0);

const sceneNodes = [meshNode, skinNode];

// ── Animation graph
const graph = new AnimationGraph(skeleton);
graph.addState('idle', buildIdleClip());
Expand All @@ -521,6 +601,9 @@ <h1>OpenHuman Engine</h1>
const parts = ['Deferred PBR · G-buffer'];
if (shadowEnabled) parts.push('PCF Shadows');
if (iblEnabled) parts.push('IBL');
if (sssEnabled) parts.push('SSS');
if (eyeEnabled) parts.push('Eye');
if (hairEnabled) parts.push('Hair');
if (acesEnabled) parts.push('ACES');
pathBadge.textContent = parts.join(' · ');
pathBadge.style.background = '#7a3c1c';
Expand Down Expand Up @@ -588,6 +671,81 @@ <h1>OpenHuman Engine</h1>
updatePathUI();
});

// SSS controls
const btnSSS = document.getElementById('btn-sss');
btnSSS.addEventListener('click', () => {
sssEnabled = !sssEnabled;
deferredRenderer.setSSSEnabled(sssEnabled);
btnSSS.textContent = sssEnabled ? 'ON' : 'OFF';
btnSSS.classList.toggle('off', !sssEnabled);
updatePathUI();
});
const sssStrength = document.getElementById('sss-strength');
const sssStrengthVal = document.getElementById('sss-strength-val');
sssStrength.addEventListener('input', () => {
const v = parseFloat(sssStrength.value);
sssStrengthVal.textContent = v.toFixed(2);
deferredRenderer.setSSSStrength(v);
});
const sssWidth = document.getElementById('sss-width');
const sssWidthVal = document.getElementById('sss-width-val');
sssWidth.addEventListener('input', () => {
const v = parseFloat(sssWidth.value);
sssWidthVal.textContent = v.toFixed(1);
deferredRenderer.setSSSWidth(v);
});
const sssR = document.getElementById('sss-r');
const sssG = document.getElementById('sss-g');
const sssB = document.getElementById('sss-b');
const sssRVal = document.getElementById('sss-r-val');
const sssGVal = document.getElementById('sss-g-val');
const sssBVal = document.getElementById('sss-b-val');
function applySSSColorFromUI() {
const r = parseFloat(sssR.value), g = parseFloat(sssG.value), b = parseFloat(sssB.value);
sssRVal.textContent = r.toFixed(2);
sssGVal.textContent = g.toFixed(2);
sssBVal.textContent = b.toFixed(2);
deferredRenderer.setSSSColor(r, g, b);
}
sssR.addEventListener('input', applySSSColorFromUI);
sssG.addEventListener('input', applySSSColorFromUI);
sssB.addEventListener('input', applySSSColorFromUI);
applySSSColorFromUI();

// Eye controls
const btnEye = document.getElementById('btn-eye');
btnEye.addEventListener('click', () => {
eyeEnabled = !eyeEnabled;
btnEye.textContent = eyeEnabled ? 'ON' : 'OFF';
btnEye.classList.toggle('off', !eyeEnabled);
updatePathUI();
});
const eyeIris = document.getElementById('eye-iris');
const eyeIrisVal = document.getElementById('eye-iris-val');
eyeIris.addEventListener('input', () => {
const v = parseFloat(eyeIris.value);
eyeIrisVal.textContent = v.toFixed(2);
eyeRenderer.setIrisDilate(v);
});

// Hair controls
const btnHair = document.getElementById('btn-hair');
btnHair.addEventListener('click', () => {
hairEnabled = !hairEnabled;
btnHair.textContent = hairEnabled ? 'ON' : 'OFF';
btnHair.classList.toggle('off', !hairEnabled);
updatePathUI();
});
const hairSpec = document.getElementById('hair-spec');
const hairSpecVal = document.getElementById('hair-spec-val');
hairSpec.addEventListener('input', () => {
const v = parseFloat(hairSpec.value);
hairSpecVal.textContent = v.toFixed(0);
hairRenderer.setSpecPower1(v);
// Secondary lobe is wider/softer than primary; clamp to keep it visible at low values.
hairRenderer.setSpecPower2(Math.max(8, v * 0.4));
});

// ── Animation controls
document.getElementById('btn-idle').addEventListener('click', () => {
graph.setBool('isTalking', false);
Expand Down Expand Up @@ -649,14 +807,28 @@ <h1>OpenHuman Engine</h1>
// ── Shadow pass (deferred path only, when shadows enabled)
const activeShadow = (useDeferred && shadowEnabled) ? shadowMap : null;
if (activeShadow) {
shadowMap.render(charNode.children, light, gpuSkin);
shadowMap.render(sceneNodes, light, gpuSkin);
}

// ── Main render
if (useDeferred) {
deferredRenderer.render(charNode.children, camera, [light], gpuSkin, activeShadow);
deferredRenderer.render(sceneNodes, camera, [light], gpuSkin, activeShadow);
} else {
forwardRenderer.render(charNode.children, camera, [light], gpuSkin);
forwardRenderer.render(sceneNodes, camera, [light], gpuSkin);
}

// Forward overlay passes for specialised eye/hair shaders
if (eyeEnabled || hairEnabled) {
// Clear depth so eye/hair overlay passes can render on top of deferred scene color.
gl.clear(gl.DEPTH_BUFFER_BIT);
}
if (eyeEnabled) {
eyeNode.updateWorldMatrix(null);
eyeRenderer.render([eyeNode], camera, [light]);
}
if (hairEnabled) {
hairNode.updateWorldMatrix(null);
hairRenderer.render([hairNode], camera, [light]);
}

// ── FPS counter
Expand Down
56 changes: 52 additions & 4 deletions src/renderer/DeferredRenderer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
import { Shader } from '../core/Shader.js';
import { RenderTarget } from '../core/RenderTarget.js';
import { PostProcessStack } from './PostProcessStack.js';
import { SSSPass } from './SSSPass.js';
import { Mat4 } from '../math/Mat4.js';
import { Mat3 } from '../math/Mat3.js';

Expand Down Expand Up @@ -463,6 +464,16 @@ export class DeferredRenderer {
depthAttachment: false,
});

// ── SSS post-process (skin subsurface scattering)
// Rendered between lighting pass and tonemap.
this._sssPass = new SSSPass(glContext, stateCache, { width: w, height: h });
// Secondary HDR target written by SSS pass; tonemap reads from it when SSS is on.
this._sssTarget = new RenderTarget(gl, {
width: w, height: h,
colorAttachments: ['RGBA16F'],
depthAttachment: false,
});

// ── Post-process stack (ACES tone-map)
this._postStack = new PostProcessStack(glContext, stateCache, { width: w, height: h });

Expand Down Expand Up @@ -515,10 +526,22 @@ export class DeferredRenderer {
// 3 ── Lighting pass → HDR target
this._lightingPass(camera, dirLight, shadowMap);

// 4 ── Tone-map pass → canvas
const gl = this.gl;
// 4 ── Optional SSS pass (skin) → sssTarget
if (this._sssPass.enabled) {
this._sssTarget.bind();
this._sssPass.render(
this._hdrTarget.getColorTexture(0),
this._gBuffer.getColorTexture(1),
this._gBuffer.getColorTexture(0),
this._gBuffer.width,
this._gBuffer.height
);
this._sssTarget.unbind();
}

// 5 ── Tone-map pass → canvas
this._postStack.render(
this._hdrTarget.getColorTexture(0),
this._sssPass.enabled ? this._sssTarget.getColorTexture(0) : this._hdrTarget.getColorTexture(0),
this._gBuffer.width,
this._gBuffer.height
);
Expand Down Expand Up @@ -569,18 +592,42 @@ export class DeferredRenderer {
/** @param {number} v */
setIBLIntensity(v) { this._iblIntensity = Math.max(0, v); }

/** @param {boolean} enabled */
setSSSEnabled(enabled) {
this._sssPass.setEnabled(!!enabled);
}

/** @param {number} value */
setSSSStrength(value) {
this._sssPass.setStrength(value);
}

/** @param {number} value */
setSSSWidth(value) {
this._sssPass.setWidth(value);
}

/** @param {number} r @param {number} g @param {number} b */
setSSSColor(r, g, b) {
this._sssPass.setColor(r, g, b);
}

/** Handle canvas resize. */
resize(w, h) {
const cache = this.cache;
this._gBuffer.resize(w, h);
this._hdrTarget.resize(w, h);
this._sssTarget.resize(w, h);
this._sssPass.resize(w, h);
this._postStack.resize(w, h);
cache.setViewport(0, 0, w, h);
}

destroy() {
this._gBuffer?.destroy();
this._hdrTarget?.destroy();
this._sssTarget?.destroy();
this._sssPass?.destroy();
this._postStack?.destroy();
this._geoShader?.destroy();
this._geoSkinnedShader?.destroy();
Expand All @@ -589,7 +636,8 @@ export class DeferredRenderer {
if (this._brdfLUT) gl.deleteTexture(this._brdfLUT);
if (this._irradianceTex) gl.deleteTexture(this._irradianceTex);
if (this._envTex) gl.deleteTexture(this._envTex);
this._gBuffer = this._hdrTarget = this._postStack = null;
this._gBuffer = this._hdrTarget = this._sssTarget = this._postStack = null;
this._sssPass = null;
this._geoShader = this._geoSkinnedShader = this._lightShader = null;
this._brdfLUT = this._irradianceTex = this._envTex = null;
}
Expand Down
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