👗 Virtual Try-On Studio

Core Source Code & AR Fashion Technology Implementation

React 19 TypeScript WebGL AR/3D Processing

🔍 About This Code Showcase

This curated code snippet demonstrates how the Virtual Try-On Studio performs 3D body mapping, realistic fabric simulation, and seamless AR integration for immersive fashion experiences.

Full deployment scripts, API integrations, and proprietary details are omitted for clarity and security. This showcase highlights the core 3D rendering and virtual fitting algorithms.

🎯 Core Algorithm: 3D Body Mapping Engine

The foundation of the Virtual Try-On Studio is its ability to create accurate 3D body models from camera input, perform realistic garment fitting, and render natural-looking virtual try-on experiences:

📄 body_mapping_engine.ts

import * as THREE from 'three';
import { MediaPipeHolistic } from '@mediapipe/holistic';
import { FabricPhysics } from './fabric-physics';

interface BodyMeasurements {
  chest: number;
  waist: number;
  hips: number;
  shoulders: number;
  inseam: number;
  armLength: number;
  bodyHeight: number;
}

class BodyMappingEngine {
  private scene: THREE.Scene;
  private camera: THREE.PerspectiveCamera;
  private renderer: THREE.WebGLRenderer;
  private bodyMesh: THREE.Mesh;
  private holistic: MediaPipeHolistic;

  // Standard body reference points for clothing fitting
  private bodyLandmarks = {
    shoulders: [11, 12], // Left and right shoulder indices
    chest: [11, 12, 23, 24], // Chest measurement points
    waist: [23, 24], // Hip landmarks for waist estimation
    hips: [23, 24], // Hip measurement points
    arms: [11, 13, 15, 17, 19], // Arm chain: shoulder to fingertips
    legs: [23, 25, 27, 29, 31] // Leg chain: hip to ankle
  };

  // Garment categories with fitting parameters
  private garmentTypes = {
    shirt: {
      fitPoints: ['shoulders', 'chest', 'armLength'],
      allowance: { chest: 4, shoulders: 2, armLength: 1 }
    },
    pants: {
      fitPoints: ['waist', 'hips', 'inseam'],
      allowance: { waist: 3, hips: 2, inseam: 0 }
    },
    dress: {
      fitPoints: ['chest', 'waist', 'hips', 'bodyHeight'],
      allowance: { chest: 3, waist: 2, hips: 3, bodyHeight: 0 }
    }
  };

  constructor(canvas: HTMLCanvasElement) {
    this.initializeThreeJS(canvas);
    this.initializeMediaPipe();
  }

  async createBodyModel(videoFrame: HTMLVideoElement): Promise<BodyMeasurements> {
    """
    Create accurate 3D body model from camera input.
    Analyzes pose landmarks and estimates body measurements for garment fitting.

    Args:
        videoFrame: Live video feed from user's camera

    Returns:
        Body measurements object with key dimensions
    """

    // Step 1: Extract pose landmarks from video frame
    const poseResults = await this.holistic.send({ image: videoFrame });

    if (!poseResults.poseLandmarks) {
      throw new Error('Unable to detect pose - please ensure full body is visible');
    }

    // Step 2: Calculate real-world measurements from landmarks
    const measurements = this.calculateBodyMeasurements(poseResults.poseLandmarks);

    // Step 3: Generate 3D body mesh for virtual fitting
    const bodyMesh = this.generateBodyMesh(measurements, poseResults.poseLandmarks);

    // Step 4: Optimize mesh for clothing simulation
    const optimizedMesh = this.optimizeMeshForClothing(bodyMesh);

    // Step 5: Update 3D scene with new body model
    this.updateBodyMesh(optimizedMesh);

    return measurements;
  }

  private calculateBodyMeasurements(landmarks: any[]): BodyMeasurements {
    """
    Calculate precise body measurements from pose landmarks.
    Uses anatomical proportions and depth estimation for accuracy.
    """

    // Calculate shoulder width using landmark distance
    const leftShoulder = landmarks[this.bodyLandmarks.shoulders[0]];
    const rightShoulder = landmarks[this.bodyLandmarks.shoulders[1]];
    const shoulderWidth = this.calculateDistance3D(leftShoulder, rightShoulder);

    // Estimate chest circumference using shoulder width and anatomical ratios
    const chestCircumference = shoulderWidth * 2.1; // Average anatomical ratio

    // Calculate waist measurement using hip landmarks
    const leftHip = landmarks[this.bodyLandmarks.waist[0]];
    const rightHip = landmarks[this.bodyLandmarks.waist[1]];
    const hipWidth = this.calculateDistance3D(leftHip, rightHip);
    const waistCircumference = hipWidth * 1.8; // Waist typically smaller than hips

    // Calculate hip circumference
    const hipCircumference = hipWidth * 2.0;

    // Calculate arm length (shoulder to wrist)
    const leftWrist = landmarks[15]; // Left wrist landmark
    const armLength = this.calculateDistance3D(leftShoulder, leftWrist);

    // Calculate inseam (hip to ankle)
    const leftAnkle = landmarks[27]; // Left ankle landmark
    const inseam = this.calculateDistance3D(leftHip, leftAnkle) * 0.8; // Adjust for inseam vs outer leg

    // Calculate total body height
    const head = landmarks[0]; // Head top landmark
    const bodyHeight = this.calculateDistance3D(head, leftAnkle);

    return {
      chest: chestCircumference,
      waist: waistCircumference,
      hips: hipCircumference,
      shoulders: shoulderWidth,
      armLength: armLength,
      inseam: inseam,
      bodyHeight: bodyHeight
    };
  }

  async fitGarment(
    garmentModel: THREE.Object3D,
    garmentType: string,
    bodyMeasurements: BodyMeasurements
  ): Promise<THREE.Object3D> {
    """
    Fit virtual garment to user's body measurements.
    Applies realistic fabric physics and ensures proper sizing.
    """

    // Get fitting parameters for garment type
    const fittingParams = this.garmentTypes[garmentType];
    if (!fittingParams) {
      throw new Error(`Unknown garment type: ${garmentType}`);
    }

    // Step 1: Scale garment to body measurements
    const scaledGarment = this.scaleGarmentToBody(garmentModel, bodyMeasurements, fittingParams);

    // Step 2: Position garment on body model
    const positionedGarment = this.positionGarmentOnBody(scaledGarment, garmentType);

    // Step 3: Apply fabric physics simulation
    const physicsSim = new FabricPhysics(scaledGarment, this.bodyMesh);
    const simulatedGarment = await physicsSim.simulate(60); // 60 frames for stable simulation

    // Step 4: Add realistic fabric behavior (draping, wrinkles)
    const finalGarment = this.addFabricDetails(simulatedGarment, garmentType);

    // Step 5: Optimize for real-time rendering
    this.optimizeForRendering(finalGarment);

    return finalGarment;
  }

  private scaleGarmentToBody(
    garment: THREE.Object3D,
    measurements: BodyMeasurements,
    fittingParams: any
  ): THREE.Object3D {
    """
    Scale garment geometry to match user's body measurements.
    Maintains garment proportions while ensuring proper fit.
    """

    const scaledGarment = garment.clone();

    // Calculate scaling factors for each dimension
    const scaleFactors = {
      x: 1.0, // Width scaling
      y: 1.0, // Height scaling
      z: 1.0  // Depth scaling
    };

    // Adjust scaling based on fit points
    fittingParams.fitPoints.forEach(fitPoint => {
      switch (fitPoint) {
        case 'chest':
          const targetChest = measurements.chest + fittingParams.allowance.chest;
          scaleFactors.x = Math.max(scaleFactors.x, targetChest / 100); // Base size 100cm
          scaleFactors.z = Math.max(scaleFactors.z, targetChest / 100);
          break;

        case 'shoulders':
          const targetShoulders = measurements.shoulders + fittingParams.allowance.shoulders;
          scaleFactors.x = Math.max(scaleFactors.x, targetShoulders / 45); // Base shoulder width
          break;

        case 'bodyHeight':
          const targetHeight = measurements.bodyHeight + fittingParams.allowance.bodyHeight;
          scaleFactors.y = targetHeight / 170; // Base height 170cm
          break;

        case 'armLength':
          // Adjust sleeve length specifically
          const targetArmLength = measurements.armLength + fittingParams.allowance.armLength;
          this.adjustSleeveLength(scaledGarment, targetArmLength);
          break;
      }
    });

    // Apply scaling to garment mesh
    scaledGarment.scale.set(scaleFactors.x, scaleFactors.y, scaleFactors.z);

    return scaledGarment;
  }

  private calculateDistance3D(point1: any, point2: any): number {
    """
    Calculate 3D distance between two landmark points.
    Accounts for depth information from pose estimation.
    """

    const dx = point2.x - point1.x;
    const dy = point2.y - point1.y;
    const dz = (point2.z || 0) - (point1.z || 0); // Handle 2D landmarks

    // Convert normalized coordinates to real-world measurements (cm)
    const distance = Math.sqrt(dx * dx + dy * dy + dz * dz);

    // Scale factor based on average human proportions
    const scaleFactor = 170; // Assumes 170cm average height

    return distance * scaleFactor;
  }
                

🧵 Advanced Fabric Simulation Engine

The fabric simulation system provides realistic cloth behavior, natural draping, and accurate material properties for immersive virtual try-on experiences:

📄 fabric_physics_engine.ts

class FabricPhysics {
  private clothMesh: THREE.Mesh;
  private bodyMesh: THREE.Mesh;
  private constraints: Constraint[] = [];
  private particles: Particle[] = [];

  // Fabric material properties for realistic simulation
  private materialProperties = {
    cotton: { stiffness: 0.3, damping: 0.8, density: 1.5 },
    silk: { stiffness: 0.1, damping: 0.9, density: 1.3 },
    denim: { stiffness: 0.7, damping: 0.6, density: 1.8 },
    leather: { stiffness: 0.9, damping: 0.4, density: 2.2 },
    polyester: { stiffness: 0.4, damping: 0.7, density: 1.4 }
  };

  constructor(clothMesh: THREE.Mesh, bodyMesh: THREE.Mesh) {
    this.clothMesh = clothMesh;
    this.bodyMesh = bodyMesh;
    this.initializePhysicsSystem();
  }

  async simulate(frames: number, materialType: string = 'cotton'): Promise<THREE.Mesh> {
    """
    Run fabric physics simulation for realistic cloth behavior.
    Simulates gravity, wind, collision with body, and material properties.

    Args:
        frames: Number of simulation steps for stability
        materialType: Fabric material affecting draping behavior

    Returns:
        Updated mesh with realistic fabric deformation
    """

    const material = this.materialProperties[materialType] || this.materialProperties.cotton;

    // Initialize particle system from mesh vertices
    this.initializeParticles(material);

    // Create constraints for fabric integrity
    this.createFabricConstraints();

    // Run physics simulation
    for (let frame = 0; frame < frames; frame++) {
      // Apply forces (gravity, wind, body interaction)
      this.applyForces(material);

      // Update particle positions
      this.updateParticles(material);

      // Satisfy constraints (maintain fabric structure)
      this.satisfyConstraints();

      // Handle collision with body mesh
      this.handleBodyCollisions();

      // Update mesh geometry with new particle positions
      if (frame % 5 === 0) { // Update mesh every 5 frames for performance
        this.updateMeshFromParticles();
      }
    }

    // Final mesh update and smoothing
    this.updateMeshFromParticles();
    this.smoothMeshSurface();

    return this.clothMesh;
  }

  private initializeParticles(material: any): void {
    """
    Convert mesh vertices to physics particles for simulation.
    Each vertex becomes a particle with mass and velocity.
    """

    const geometry = this.clothMesh.geometry;
    const positions = geometry.attributes.position.array;

    this.particles = [];

    for (let i = 0; i < positions.length; i += 3) {
      const particle = new Particle(
        new THREE.Vector3(positions[i], positions[i + 1], positions[i + 2]),
        material.density
      );

      // Pin certain particles (e.g., collar, shoulders) to body
      if (this.shouldPinParticle(particle.position)) {
        particle.pinned = true;
      }

      this.particles.push(particle);
    }
  }

  private applyForces(material: any): void {
    """
    Apply physical forces to particles for realistic behavior.
    Includes gravity, air resistance, and fabric tension.
    """

    const gravity = new THREE.Vector3(0, -9.81, 0); // Gravity force
    const wind = new THREE.Vector3(0.1, 0, 0.2); // Subtle wind effect

    this.particles.forEach(particle => {
      if (particle.pinned) return; // Skip pinned particles

      // Apply gravity based on particle mass
      const gravityForce = gravity.clone().multiplyScalar(particle.mass);
      particle.addForce(gravityForce);

      // Apply wind resistance
      const windResistance = wind.clone().multiplyScalar(0.01);
      particle.addForce(windResistance);

      // Apply damping to reduce oscillations
      const damping = particle.velocity.clone().multiplyScalar(-material.damping * 0.1);
      particle.addForce(damping);
    });
  }

  private satisfyConstraints(): void {
    """
    Maintain fabric structural integrity by satisfying distance constraints.
    Prevents fabric from stretching beyond realistic limits.
    """

    // Multiple constraint satisfaction iterations for stability
    for (let iteration = 0; iteration < 3; iteration++) {
      this.constraints.forEach(constraint => {
        const p1 = this.particles[constraint.particle1Index];
        const p2 = this.particles[constraint.particle2Index];

        // Calculate current distance between particles
        const delta = p2.position.clone().sub(p1.position);
        const currentDistance = delta.length();
        const difference = currentDistance - constraint.restLength;

        // Apply correction to maintain rest length
        if (Math.abs(difference) > 0.001) { // Threshold to avoid micro-adjustments
          const correction = delta.normalize().multiplyScalar(difference * 0.5);

          if (!p1.pinned) p1.position.add(correction);
          if (!p2.pinned) p2.position.sub(correction);
        }
      });
    }
  }

  private handleBodyCollisions(): void {
    """
    Handle collisions between fabric and body mesh.
    Prevents fabric from intersecting with the body model.
    """

    const bodyBoundingBox = new THREE.Box3().setFromObject(this.bodyMesh);

    this.particles.forEach(particle => {
      if (particle.pinned) return;

      // Check if particle is inside body bounding box
      if (bodyBoundingBox.containsPoint(particle.position)) {
        // Find closest point on body surface
        const closestPoint = this.findClosestPointOnBody(particle.position);

        // Move particle to body surface with small offset
        const normal = particle.position.clone().sub(closestPoint).normalize();
        const offset = normal.multiplyScalar(0.5); // 0.5cm offset from body

        particle.position.copy(closestPoint.add(offset));
        particle.velocity.multiplyScalar(0.5); // Reduce velocity after collision
      }
    });
  }

  private updateMeshFromParticles(): void {
    """
    Update mesh geometry with new particle positions.
    Transfers physics simulation results back to visual mesh.
    """

    const geometry = this.clothMesh.geometry;
    const positions = geometry.attributes.position.array;

    // Update vertex positions from particle positions
    for (let i = 0; i < this.particles.length; i++) {
      const particle = this.particles[i];
      positions[i * 3] = particle.position.x;
      positions[i * 3 + 1] = particle.position.y;
      positions[i * 3 + 2] = particle.position.z;
    }

    // Mark geometry for update
    geometry.attributes.position.needsUpdate = true;

    // Recalculate normals for proper lighting
    geometry.computeVertexNormals();
  }

  private shouldPinParticle(position: THREE.Vector3): boolean {
    """
    Determine if a particle should be pinned to the body.
    Typically applies to collar, shoulder seams, and waistbands.
    """

    // Pin particles near shoulder area (y > 1.4 and close to body center)
    if (position.y > 1.4 && Math.abs(position.x) < 0.3) {
      return true;
    }

    // Pin particles at collar level
    if (position.y > 1.6 && Math.abs(position.z) < 0.1) {
      return true;
    }

    return false;
  }
}

// Particle class for physics simulation
class Particle {
  position: THREE.Vector3;
  oldPosition: THREE.Vector3;
  velocity: THREE.Vector3;
  force: THREE.Vector3;
  mass: number;
  pinned: boolean = false;

  constructor(position: THREE.Vector3, mass: number) {
    this.position = position.clone();
    this.oldPosition = position.clone();
    this.velocity = new THREE.Vector3();
    this.force = new THREE.Vector3();
    this.mass = mass;
  }

  addForce(force: THREE.Vector3): void {
    this.force.add(force);
  }

  update(damping: number): void {
    if (this.pinned) return;

    // Verlet integration for stable physics
    const acceleration = this.force.clone().divideScalar(this.mass);
    const newPosition = this.position.clone()
      .multiplyScalar(2)
      .sub(this.oldPosition)
      .add(acceleration.multiplyScalar(0.016 * 0.016)); // dt^2 for 60fps

    this.oldPosition.copy(this.position);
    this.position.copy(newPosition);
    this.force.set(0, 0, 0); // Reset forces
  }
}
                

⚙️ Technical Implementation Notes

Key Algorithms & Innovations

3D Body Mapping: MediaPipe pose estimation for accurate body dimension calculation
Fabric Physics: Verlet integration and constraint solving for realistic cloth simulation
Collision Detection: Advanced algorithms prevent fabric-body intersection
Material Properties: Realistic fabric behavior based on material characteristics
Real-time Rendering: Optimized Three.js pipeline for smooth AR experience

Why This Approach Works

Photorealistic Results: Advanced physics simulation creates believable virtual try-on experience
Accurate Fitting: Precise body measurements ensure proper garment sizing
Material Authenticity: Different fabric behaviors provide realistic draping and movement
Performance Optimized: Efficient algorithms enable real-time interaction on consumer devices

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