Ergonomic Furniture Design: Modeling a Task Chair with Rhino & Grasshopper

Free Rhino 3D & Grasshopper Course | Workflow Webinar 5.0

Welcome to the fifth module of our free Rhino 3D and Grasshopper course. In this 1.5-hour session, we take on the ultimate furniture design challenge: modeling a Herman Miller-style ergonomic chair. This lesson covers everything from structural NURBS surfacing to mechanical assembly and complex parametric mesh texturing using the Lunchbox plugin.

Download Files: cademy.xyz/webinar5

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What’s included in this lesson:

• Full Video Tutorial: Follow along with our 1.5-hour step-by-step recording.
• Project Files: Download the exact Rhino and Grasshopper files to practice.
• Portfolio Piece: A high-quality assembly project perfect for students and professional portfolios.

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What you will learn in this module:

• Complex Assembly Modeling: How to manage multiple components including frames, cushions, and mechanical adjustment systems.
• Advanced NURBS Continuity: Using NetworkSrf and BlendSrf to create organic, breathable surfaces that meet industrial design standards.
• Lunchbox Plugin for Grasshopper: Leveraging computational design tools to create staggered, dynamic mesh patterns for back support.
• Attractor-Based Perforation: Using Pull Point logic and Tween Curves to create a custom "breathable" texture that varies across the surface.
• Manufacturing Preparation: Exporting watertight STL files for SLA and FDM 3D printing.

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Step 1: Base Structure

• Create a side profile using the Project command.
• Use Loft to generate the primary surface for the back support.
• Add guiding curves and refine the back profile.

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Step 2: Surface Creation

• Use BlendCrv for smooth curve connections (G0 and G1 continuity).
• Generate a surface using NetworkSrf from U and V curves.

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Step 3: Cut-Outs & Refinement

• Draw outer and Y-shaped cut-out profiles.
• Trim surfaces using these profiles to refine the chair’s structure.

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Step 4: Seat & Frame Integration

• Connect the Y cutout to the seat frame with BlendSrf.
• Add thickness by scaling the PolySurface and connecting with Loft.

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Step 5: Cushion Modeling

• Create three profiles for the cushion.
• Use Extrude, Rebuild, and BlendSrf for realistic organic shaping.

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Step 6: Mechanical Assembly

• Extrude profiles for the chair’s height and angle adjustment system.
• Use Boolean Intersection to refine mechanical components.

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Step 7: Armrest Construction

• Extrude profiles, split excess surfaces, and use BlendSrf.
• Apply Fillet for smooth ergonomic transitions.

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Step 8: Arm Support

• Structure created with extrusions and BlendSrf.
• Rotate 35º for ergonomic inclination.

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Step 9: Wheel Assembly

• Use Polar Array for five evenly spaced wheels.
• Apply Revolve and Boolean operations for support frames.

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Step 10: Final Assembly

• Position and align all chair components.

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Step 11: Mesh Texturing (Grasshopper 3D)

• Extract the back support surface.
• Use the Lunchbox plugin to refine the isocurves.
• Apply the staggered panel component for a dynamic, modern texture.

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Step 12: Attractor Influence

• Extract surface center and normal using Evaluate Surface.
• Reparameterize the surface and apply an attractor geometry with Pull Point.

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Step 13: Patterned Perforation

• Use Tween Curves to interpolate between two profiles.
• Assign curves dynamically using List Item based on the attractor field.
• Extrude and perform Boolean Difference for the final perforation texture.

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Step 14: Import & Material Setup (KeyShot)

• Open the .3dm file in KeyShot.
• Apply Solid Glass material with 90% white color.
• Adjust roughness (0.05) for a professional frosted effect.

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Step 15: Advanced Texturing

• Use the Mesh procedural node for vertical line effects.
• Control spacing and thickness, applying the texture as a Bump parameter for realism.

Software & Manufacturing

• Software: Rhinoceros 3D, Grasshopper 3D, KeyShot, ChituBox.
• 3D Printing: Export high-quality STL files for SLA + FDM techniques.

Thank you for reading ❤️