Does a second 3D cloth model, wrapped over the hanger arm, agree with the 2D hanger drape?

What it found

An independent 3D mass-spring sheet that wraps over a round-ended arm (cross-check of hanger-3d), draped on the hangers of hanger-fit with the same fabric constants and mass. It picks the same best arm width as the 2D chain (22.8 cm for a size M tee; error correlation 0.994 over a width sweep), with error 0.1–0.4 cm higher near the optimum, and adds the bend across the arm: 119 deg/cm over a 0.5 cm arm against 34 over a 2 cm one. It disagrees for a heavy knit on a thin arm (17.8 cm against 5.6 cm error) and is not grid-converged (1.19 against 0.62 cm at 1 and 0.5 cm spacing). Stylised, assumed fabric constants.

A figure from its own output

Paper, code and results

• README and method
• Experiments and results
• Code
• Tests

More in Laundry-hanging robots

• Should a laundry-hanging arm yield to the other arm's next pick only when the clash would be long? Gating lookahead by predicted overlap, paired on 1000 loadsShould an arm yield to the other arm's next pick only when the clash would be long? Gating by predicted overlap removes most of lookahead's loss and gains +0.7 to +1.35 garments an hour for pinching at 0.30 m (paired, 1000 loads). Stylised: inputs are placeholders.
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• How does a laundry robot get a hanger into a garment, and what does it cost the neck?How does a laundry robot get a hanger into a garment, and what does it cost the neck? A swept-section model of a rigid, telescoping or folding hanger passing a neck or hem loop: rigid hangers need 43–61 cm of loop, a tee's neck stretches up to 33% and a buttoned shirt collar cannot take them at all (shirts go in at the hem, 10 s against 6 s); a hanger that collapses to a 10 cm half width needs 31 cm. The round end hanger-fit wants costs about 3 cm more. Stylised, assumed constants.
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All 25 Laundry-hanging robots projects →

Other research topics

Proper scoring & elicitation28Effort & peer prediction9Verification games & slashing19Detection & tolerances14Markets as routers13Prediction-market design9Paying contributors8Decentralised training systems23Digital twins & sim-to-real164LLM chip design loops40Robot manufacturing loops53Ambient AI assistant46Self-replicating manufacturing34Simulation-first design64Engineered clothing45Task-specific AI accelerators40Algorithmic chip-design loops42Open-source purpose-built robots44The software-engineering loop43Adversarial human imitation41Open-source residential construction41Autonomous multi-angle capture34Sensing, imaging and 3D31Energy supply and dense energy storage39Robot societies among people31Agentic co-design of low-cost robots27Laundry-hanging robots25Machine learning on qualitative data23Robots on the building site27Civilizations & group psychology1History & human sciences1

Produced with AI assistance (Claude). Results are from the code in this repository and are simulated or stylised unless the abstract says otherwise; nothing here implies affiliation with or endorsement by any lab, researcher or company cited. MIT licensed.