Three.js Particle System Shape Morphing Effect

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<div id="loading">
        <span>Initializing Particles...</span>
        <div id="progress-container">
             <div id="progress"></div>
        </div>
    </div>

<div id="ui">
        <div id="info">Shape: Sphere (Click to morph)</div>
    </div>

<div id="controls">
        <button id="shape-btn">Change Shape</button>

let scene, camera, renderer, controls, clock;
        let composer, bloomPass;

let particlesGeometry, particlesMaterial, particleSystem;
        let currentPositions, sourcePositions, targetPositions, swarmPositions; 
        let particleSizes, particleOpacities, particleEffectStrengths; 
        let noise3D, noise4D;

let morphTimeline = null; 
        let isInitialized = false;
        let isMorphing = false;

const CONFIG = {
            particleCount: 15000,
            shapeSize: 14,
            swarmDistanceFactor: 1.5,
            swirlFactor: 4.0,
            noiseFrequency: 0.1,
            noiseTimeScale: 0.04,
            noiseMaxStrength: 2.8,
            colorScheme: 'fire',
            morphDuration: 4000,
            particleSizeRange: [0.08, 0.25],
            starCount: 18000,
            bloomStrength: 1.3,
            bloomRadius: 0.5,
            bloomThreshold: 0.05,
            idleFlowStrength: 0.25,
            idleFlowSpeed: 0.08,
            idleRotationSpeed: 0.02,
            morphSizeFactor: 0.5, 
            morphBrightnessFactor: 0.6 
        };

const SHAPES = [
            { name: 'Sphere', generator: generateSphere },
            { name: 'Cube', generator: generateCube },
            { name: 'Pyramid', generator: generatePyramid },
            { name: 'Torus', generator: generateTorus },
            { name: 'Galaxy', generator: generateGalaxy },
            { name: 'Wave', generator: generateWave }
        ];
        let currentShapeIndex = 0;

const morphState = { progress: 0.0 };

const COLOR_SCHEMES = {
            fire: { startHue: 0, endHue: 45, saturation: 0.95, lightness: 0.6 },
            neon: { startHue: 300, endHue: 180, saturation: 1.0, lightness: 0.65 },
            nature: { startHue: 90, endHue: 160, saturation: 0.85, lightness: 0.55 },
            rainbow: { startHue: 0, endHue: 360, saturation: 0.9, lightness: 0.6 }
        };

const tempVec = new THREE.Vector3();
        const sourceVec = new THREE.Vector3();
        const targetVec = new THREE.Vector3();
        const swarmVec = new THREE.Vector3();
        const noiseOffset = new THREE.Vector3();
        const flowVec = new THREE.Vector3();
        const bezPos = new THREE.Vector3();
        const swirlAxis = new THREE.Vector3();
        const currentVec = new THREE.Vector3();

clock = new THREE.Clock();
            noise3D = createNoise3D(() => Math.random());
            noise4D = createNoise4D(() => Math.random());
            scene = new THREE.Scene();
            scene.fog = new THREE.FogExp2(0x000308, 0.03);
            updateProgress(5);

camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.1, 1000);
            camera.position.set(0, 8, 28); 
            camera.lookAt(scene.position);
            updateProgress(5);

const canvas = document.getElementById('webglCanvas');
            renderer = new THREE.WebGLRenderer({ canvas, antialias: true, alpha: true, powerPreference: 'high-performance' });
            renderer.setSize(window.innerWidth, window.innerHeight);
            renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
            renderer.toneMapping = THREE.ACESFilmicToneMapping;
            renderer.toneMappingExposure = 1.1;
            updateProgress(10);

controls = new OrbitControls(camera, renderer.domElement);
            controls.enableDamping = true; controls.dampingFactor = 0.05;
            controls.minDistance = 5; controls.maxDistance = 80;
            controls.autoRotate = true; controls.autoRotateSpeed = 0.3;
            updateProgress(5);

scene.add(new THREE.AmbientLight(0x404060));
            const dirLight1 = new THREE.DirectionalLight(0xffffff, 1.5);
            dirLight1.position.set(15, 20, 10); scene.add(dirLight1);
            const dirLight2 = new THREE.DirectionalLight(0x88aaff, 0.9);
            dirLight2.position.set(-15, -10, -15); scene.add(dirLight2);
            updateProgress(10);

setupPostProcessing(); updateProgress(10);
            createStarfield(); updateProgress(15);
            setupParticleSystem(); updateProgress(25);

isInitialized = true;
            animate();
            console.log("Initialization complete.");
        }

function setupPostProcessing() {
            composer = new EffectComposer(renderer);
            composer.addPass(new RenderPass(scene, camera));
            bloomPass = new UnrealBloomPass(new THREE.Vector2(window.innerWidth, window.innerHeight), CONFIG.bloomStrength, CONFIG.bloomRadius, CONFIG.bloomThreshold);
            composer.addPass(bloomPass);
        }

function createStarTexture() {
            const size = 64; const canvas = document.createElement('canvas');
            canvas.width = size; canvas.height = size; const context = canvas.getContext('2d');
            const gradient = context.createRadialGradient(size / 2, size / 2, 0, size / 2, size / 2, size / 2);
            gradient.addColorStop(0, 'rgba(255,255,255,1)'); gradient.addColorStop(0.2, 'rgba(255,255,255,0.8)');
            gradient.addColorStop(0.5, 'rgba(255,255,255,0.3)'); gradient.addColorStop(1, 'rgba(255,255,255,0)');
            context.fillStyle = gradient; context.fillRect(0, 0, size, size);
            return new THREE.CanvasTexture(canvas);
        }

function setupParticleSystem() {
            targetPositions = SHAPES.map(shape => shape.generator(CONFIG.particleCount, CONFIG.shapeSize));
            particlesGeometry = new THREE.BufferGeometry();

currentPositions = new Float32Array(targetPositions[0]);
            sourcePositions = new Float32Array(targetPositions[0]);
            swarmPositions = new Float32Array(CONFIG.particleCount * 3);
            particlesGeometry.setAttribute('position', new THREE.BufferAttribute(currentPositions, 3));

particleSizes = new Float32Array(CONFIG.particleCount);
            particleOpacities = new Float32Array(CONFIG.particleCount);
            particleEffectStrengths = new Float32Array(CONFIG.particleCount);
            for (let i = 0; i < CONFIG.particleCount; i++) {
                particleSizes[i] = THREE.MathUtils.randFloat(CONFIG.particleSizeRange[0], CONFIG.particleSizeRange[1]);
                particleOpacities[i] = 1.0;
                particleEffectStrengths[i] = 0.0;
            }
            particlesGeometry.setAttribute('size', new THREE.BufferAttribute(particleSizes, 1));
            particlesGeometry.setAttribute('opacity', new THREE.BufferAttribute(particleOpacities, 1));
            particlesGeometry.setAttribute('aEffectStrength', new THREE.BufferAttribute(particleEffectStrengths, 1));

const colors = new Float32Array(CONFIG.particleCount * 3);
            updateColorArray(colors, currentPositions);
            particlesGeometry.setAttribute('color', new THREE.BufferAttribute(colors, 3));

particlesMaterial = new THREE.ShaderMaterial({
                 uniforms: {
                      pointTexture: { value: createStarTexture() }
                 },
                 vertexShader: `
                      attribute float size;
                      attribute float opacity;
                      attribute float aEffectStrength;
                      varying vec3 vColor;
                      varying float vOpacity;
                      varying float vEffectStrength;

void main() {
                           vColor = color;
                           vOpacity = opacity;
                           vEffectStrength = aEffectStrength;

vec4 mvPosition = modelViewMatrix * vec4(position, 1.0);

float sizeScale = 1.0 - vEffectStrength * ${CONFIG.morphSizeFactor.toFixed(2)};
                           gl_PointSize = size * sizeScale * (400.0 / -mvPosition.z);

gl_Position = projectionMatrix * mvPosition;
                      }
                 `,
                 fragmentShader: `
                      uniform sampler2D pointTexture;
                      varying vec3 vColor;
                      varying float vOpacity;
                      varying float vEffectStrength;

void main() {
                           float alpha = texture2D(pointTexture, gl_PointCoord).a;
                           if (alpha < 0.05) discard;

vec3 finalColor = vColor * (1.0 + vEffectStrength * ${CONFIG.morphBrightnessFactor.toFixed(2)});

gl_FragColor = vec4(finalColor, alpha * vOpacity);
                      }
                 `,
                 blending: THREE.AdditiveBlending,
                 depthTest: true,
                 depthWrite: false,
                 transparent: true,
                 vertexColors: true
            });

particleSystem = new THREE.Points(particlesGeometry, particlesMaterial);
            scene.add(particleSystem);
        }

function updateColors() {
            const colors = particlesGeometry.attributes.color.array;
            updateColorArray(colors, particlesGeometry.attributes.position.array);
            particlesGeometry.attributes.color.needsUpdate = true;
        }

function animate() {
            requestAnimationFrame(animate);
            if (!isInitialized) return;
            const elapsedTime = clock.getElapsedTime();
            const deltaTime = clock.getDelta();
            controls.update();
            const positions = particlesGeometry.attributes.position.array;
            const effectStrengths = particlesGeometry.attributes.aEffectStrength.array;

if (isMorphing) {
                updateMorphAnimation(positions, effectStrengths, elapsedTime, deltaTime);
            } else {
                updateIdleAnimation(positions, effectStrengths, elapsedTime, deltaTime);
            }
            particlesGeometry.attributes.position.needsUpdate = true;
            if (isMorphing || particlesGeometry.attributes.aEffectStrength.needsUpdate) {
                 particlesGeometry.attributes.aEffectStrength.needsUpdate = true;
            }
            composer.render(deltaTime);
        }

function updateMorphAnimation(positions, effectStrengths, elapsedTime, deltaTime) {
            const t = morphState.progress;
            const targets = targetPositions[currentShapeIndex];
            const effectStrength = Math.sin(t * Math.PI);
            const currentSwirl = effectStrength * CONFIG.swirlFactor * deltaTime * 50;
            const currentNoise = effectStrength * CONFIG.noiseMaxStrength;

for (let i = 0; i < CONFIG.particleCount; i++) {
                const i3 = i * 3;
                sourceVec.fromArray(sourcePositions, i3);
                swarmVec.fromArray(swarmPositions, i3);
                targetVec.fromArray(targets, i3);

const t_inv = 1.0 - t; const t_inv_sq = t_inv * t_inv; const t_sq = t * t;
                bezPos.copy(sourceVec).multiplyScalar(t_inv_sq);
                bezPos.addScaledVector(swarmVec, 2.0 * t_inv * t);
                bezPos.addScaledVector(targetVec, t_sq);

if (currentSwirl > 0.01) {
                    tempVec.subVectors(bezPos, sourceVec);
                    swirlAxis.set( noise3D(i * 0.02, elapsedTime * 0.1, 0), noise3D(0, i * 0.02, elapsedTime * 0.1 + 5), noise3D(elapsedTime * 0.1 + 10, 0, i * 0.02) ).normalize();
                    tempVec.applyAxisAngle(swirlAxis, currentSwirl * (0.5 + Math.random() * 0.5));
                    bezPos.copy(sourceVec).add(tempVec);
                }

if (currentNoise > 0.01) {
                    const noiseTime = elapsedTime * CONFIG.noiseTimeScale;
                    noiseOffset.set( noise4D(bezPos.x * CONFIG.noiseFrequency, bezPos.y * CONFIG.noiseFrequency, bezPos.z * CONFIG.noiseFrequency, noiseTime), noise4D(bezPos.x * CONFIG.noiseFrequency + 100, bezPos.y * CONFIG.noiseFrequency + 100, bezPos.z * CONFIG.noiseFrequency + 100, noiseTime), noise4D(bezPos.x * CONFIG.noiseFrequency + 200, bezPos.y * CONFIG.noiseFrequency + 200, bezPos.z * CONFIG.noiseFrequency + 200, noiseTime) );
                    bezPos.addScaledVector(noiseOffset, currentNoise);
                }

positions[i3] = bezPos.x;
                positions[i3 + 1] = bezPos.y;
                positions[i3 + 2] = bezPos.z;

effectStrengths[i] = effectStrength;
            }
             particlesGeometry.attributes.aEffectStrength.needsUpdate = true;
        }

function updateIdleAnimation(positions, effectStrengths, elapsedTime, deltaTime) {
            const breathScale = 1.0 + Math.sin(elapsedTime * 0.5) * 0.015;
            const timeScaled = elapsedTime * CONFIG.idleFlowSpeed;
            const freq = 0.1;

let needsEffectStrengthReset = false;

for (let i = 0; i < CONFIG.particleCount; i++) {
                const i3 = i * 3;
                sourceVec.fromArray(sourcePositions, i3);
                tempVec.copy(sourceVec).multiplyScalar(breathScale);
                flowVec.set( noise4D(tempVec.x * freq, tempVec.y * freq, tempVec.z * freq, timeScaled), noise4D(tempVec.x * freq + 10, tempVec.y * freq + 10, tempVec.z * freq + 10, timeScaled), noise4D(tempVec.x * freq + 20, tempVec.y * freq + 20, tempVec.z * freq + 20, timeScaled) );
                tempVec.addScaledVector(flowVec, CONFIG.idleFlowStrength);
                currentVec.fromArray(positions, i3);
                currentVec.lerp(tempVec, 0.05);
                positions[i3] = currentVec.x;
                positions[i3 + 1] = currentVec.y;
                positions[i3 + 2] = currentVec.z;

if (effectStrengths[i] !== 0.0) {
                    effectStrengths[i] = 0.0;
                    needsEffectStrengthReset = true;
                }
            }
             if (needsEffectStrengthReset) {
                 particlesGeometry.attributes.aEffectStrength.needsUpdate = true;
             }
        }

function onCanvasClick(event) {
            if (event.target.closest('#controls')) { return; }
            triggerMorph();
        }

function onWindowResize() {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
            composer.setSize(window.innerWidth, window.innerHeight);
        }

init();

</script>

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