Gerber AccuMark 3D Virtual Sampling: 3D Fit Validation and Pattern-to-3D Workflow

Gerber AccuMark 3D Virtual Sampling: 3D Fit Validation and Pattern-to-3D Workflow

I've used AccuMark 3D to reduce physical sampling iterations for apparel brands producing in the Americas. AccuMark 3D is Gerber's virtual sampling add-on for the AccuMark platform — it takes 2D patterns from PDS and simulates them on 3D avatars for fit validation. While it's a separate module from the core AccuMark pattern and marker tools, the integration is seamless: pattern changes in PDS update the 3D simulation, and fit analysis in 3D can drive pattern adjustments.

AccuMark 3D Overview

Gerber's product page describes it: "AccuMark 3D enables virtual sampling, allowing designers to visualize garments on customizable avatars and validate fit before producing physical samples."

AccuMark 3D integrates with:

• AccuMark PDS: 2D pattern design
• AccuMark Grade Rule Tables: Graded sizes
• YuniquePLM: Style and colorway management
• AccuMark Cloud: Remote 3D viewing and collaboration

Setting Up a 3D Simulation

Step 1: Prepare the 2D Pattern

1. Create or import the 2D pattern in AccuMark PDS
2. Ensure all pattern pieces are properly defined:
   • Seam lines matched (equal lengths)
   • Notches aligned
   • Grainlines defined
   • Seam allowances added
3. Verify the pattern is production-ready

Step 2: Open AccuMark 3D

1. Launch AccuMark 3D from the AccuMark suite
2. Open the pattern from the storage area
3. The 2D pattern pieces appear in the 3D workspace

Step 3: Select an Avatar

1. Open the Avatar Library
2. Select a standard avatar:
   • Male and female bodies
   • Standard sizes (US, EU)
   • Various poses (A-pose, relaxed, walking)
3. Or import a custom avatar:
   • Body scan (FBX, OBJ)
   • Custom measurements
4. Configure avatar measurements:
   • Height, chest, waist, hip, shoulder, arm length
5. The avatar should match the target fit model

Step 4: Assign Fabric Properties

1. Open the Fabric Properties editor
2. Set physical properties:
   • Stretch (%): Warp and weft
   • Bending (g·cm): Stiffness
   • Shear (g·cm): Diagonal resistance
   • Weight (g/m²): Fabric weight
   • Thickness (mm): Fabric thickness
3. Apply texture maps (diffuse, normal, roughness)
4. Assign fabric to each pattern piece
5. AccuMark 3D includes a fabric library with common fabric types

Step 5: Position Pattern Pieces

1. Use arrangement points to position pieces on the avatar
2. Each piece snaps to its designated position:
   • Front pieces to the front
   • Back pieces to the back
   • Sleeves to the shoulders
3. Verify all pieces are outside the body
4. Adjust positions manually if needed

Step 6: Run Simulation

1. Click Simulate
2. AccuMark 3D drapes the garment on the avatar
3. The simulation runs in real-time
4. Any 2D pattern change in PDS updates the 3D simulation
5. Watch for clipping, floating, seam misalignment, and tension

Fit Validation

Tension Map

The tension map shows where the garment is under stress:

• Red/yellow: Fabric is stretched — garment is too tight
• Blue: Fabric is compressed or floating — garment is too loose
• Green/white: Normal tension — correct fit

Check tension at key fit points:

• Armhole and sleeve cap
• Chest/bust
• Waist
• Hip
• Shoulder seam
• Crotch seam
• Collar/neckline

Measurement Verification

1. Create measurement points on the garment
2. Compare simulated measurements against the spec sheet
3. Verify ease allowances:
   • Blouse: 5-10cm ease at chest
   • Fitted dress: 3-5cm ease at chest
   • Pants: 2-4cm ease at waist
4. If measurements are off, adjust the 2D pattern in PDS

Drape Analysis

1. Check the drape quality:
   • Folds and wrinkles should look natural
   • Fabric should conform to the body where designed
   • No excessive bunching or pulling
2. Compare the drape against reference photos
3. Adjust fabric properties if the drape doesn't match reality

The Pattern-to-3D-to-Pattern Workflow

Round-Trip Workflow

1. 2D Pattern (PDS): Design or modify the pattern
2. 3D Simulation (AccuMark 3D): The 3D updates automatically
3. Fit Analysis: Check tension map, measurements, and drape
4. Pattern Adjustment (PDS): Go back to 2D and adjust
5. Re-Simulation: The 3D updates with the new pattern
6. Iterate: Repeat until the fit is correct

Common Pattern Adjustments from 3D Analysis

• Tight across chest: Increase chest width in PDS
• Loose at waist: Reduce waist measurement or increase dart intake
• Sleeve cap too tight: Increase sleeve cap ease or reduce armhole depth
• Collar gaps: Adjust collar curve to match neckline
• Crotch pulls: Increase crotch depth or adjust inseam curve
• Hemline uneven: Check and adjust side seam lengths

Size Run Validation

Multi-Size 3D Validation

1. After perfecting the base size, validate the entire size run:
2. Switch the avatar to each size
3. Apply the graded patterns from the grade rule table
4. Re-simulate the garment on each size
5. Check the tension map for each size
6. Identify sizes that need grade rule adjustments
7. This prevents fit issues in production sizes

Grade Rule Adjustment from 3D

1. If a specific size shows fit issues in 3D:
   • Identify which area is too tight or too loose
   • Go to the grade rule table in AccuMark
   • Adjust the grade increment for that size at the problem area
   • Re-simulate to verify the fix
2. This ensures all sizes fit correctly, not just the base size

Colorway and Presentation

Colorway Creation

1. Apply different colors and prints to the 3D garment
2. Create multiple colorways for the same style
3. Generate colorway images for:
   • Buyer presentations
   • Internal design review
   • E-commerce pre-launch visualization

3D Image Export

1. Export high-resolution images of the 3D garment
2. Export rotation videos (turntable)
3. Export close-up images of specific details
4. Use for buyer presentations and marketing

AccuMark Cloud Sharing

1. Upload the 3D garment to AccuMark Cloud
2. Share with remote team members
3. Buyers can view the 3D garment in a web browser
4. Leave comments and feedback on specific areas
5. No AccuMark license required for viewing

YuniquePLM Integration

Style Management

1. The 3D garment links to the style in YuniquePLM
2. Style data (colorways, BOM, tech pack) is synchronized
3. The 3D image appears in the PLM style record
4. This creates a single source of truth for each style

Tech Pack with 3D

1. Generate tech packs that include 3D images
2. The tech pack includes:
   • Flat sketches (front and back)
   • 3D rendered images
   • POM spec sheet
   • BOM
   • Colorway information
3. Manufacturers receive both 2D and 3D references

Common Issues

Garment Clips Through Avatar

• Increase the avatar's collision offset
• Reduce fabric stretch values
• Check that pattern pieces start outside the body
• Increase simulation quality

Fabric Doesn't Drape Realistically

• Verify fabric properties match the actual material
• Check bending and stretch values
• Increase simulation quality
• Compare against reference photos

3D Doesn't Update After Pattern Change

• Verify the pattern is saved in PDS
• Refresh the 3D simulation
• Check that the 3D is linked to the correct pattern order
• Re-open the pattern in AccuMark 3D

Simulation Is Slow

• Reduce mesh resolution
• Lower simulation quality for design iteration
• Close other applications
• Simplify the garment for initial fitting

Summary

AccuMark 3D adds virtual sampling to the AccuMark platform with seamless PDS integration. Prepare the 2D pattern in PDS, select an avatar matching the fit model, assign fabric properties, position pieces, and run the simulation. Use the tension map for fit validation — red is too tight, blue is too loose. The round-trip workflow (PDS → 3D → fit analysis → PDS adjustment → re-simulation) enables iterative fit improvement without physical samples. Validate the entire size run by switching avatars and applying graded patterns. Create colorways and export images for buyer presentations. Share via AccuMark Cloud for remote collaboration. Integrate with YuniquePLM for complete style management with 3D images in tech packs. The most common issues — clipping, unrealistic drape, and update failures — are fixed by adjusting collision offset, fabric properties, and verifying pattern links.