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Thomas Geijtenbeek

@tgeijten.bsky.social

320 followers 190 following 24 posts

I like to simulate how humans and animals move. Creator of SCONE (https://scone.software) and Hyfydy (https://hyfydy.com).

scone.software)

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Thomas Geijtenbeek @tgeijten.bsky.social · Jul 24

I'll be presenting our new predictive simulation model at ISB 2025 in Stockholm next week!

Parallel session 9F (Movement Generation and Prediction), Wednesday July 30 from 10:40 to 12:00.

Hope to meet you there!

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Reposted by Thomas Geijtenbeek

Wonder of Science @wonderofscience.bsky.social · May 7

These boxes are not moving. A mind-bending optical illusion by Japanese artist Jagarikin.

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Thomas Geijtenbeek @tgeijten.bsky.social · Apr 20

It’s the forward dynamics simulation that runs at 20x real-time

Thomas Geijtenbeek @tgeijten.bsky.social · Apr 19

This model has 35 degrees-of-freedom, 120 musculotendon actuators and full contact geometry. Simulations run at around 20X real-time. No motion data was used.

Thomas Geijtenbeek @tgeijten.bsky.social · Apr 19

Now featuring: a full upper-body biomechanical model that learned to reach (SCONE + Hyfydy)

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Thomas Geijtenbeek @tgeijten.bsky.social · Feb 10

Please consider adding me!

Thomas Geijtenbeek @tgeijten.bsky.social · Dec 8

Please consider adding me here too!

Thomas Geijtenbeek @tgeijten.bsky.social · Dec 8

Please consider adding me as well!

Thomas Geijtenbeek @tgeijten.bsky.social · Dec 2

I simulate how animals move (see my feed for examples)

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Thomas Geijtenbeek @tgeijten.bsky.social · Nov 28

Model developed by @pashavanb.bsky.social

academic.oup.com/icb/article/...

Muscle-Driven Predictive Physics Simulations of Quadrupedal Locomotion in the Horse

Synopsis. Musculoskeletal simulations can provide insights into the underlying mechanisms that govern animal locomotion. In this study, we describe the dev

academic.oup.com

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Thomas Geijtenbeek @tgeijten.bsky.social · Nov 28

My favourite local minimum

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Thomas Geijtenbeek @tgeijten.bsky.social · Nov 23

The scapula is kept in place through spring forces between points on the scapula and an ellipsoid on the thorax. Springs that push the points outwards have a higher stiffness than springs that pull the points towards the ellipsoid.

Thomas Geijtenbeek @tgeijten.bsky.social · Nov 23

The muscle activations are optimized for the hand to reach the red sphere targets; the scapular motion emerges independently.

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Thomas Geijtenbeek @tgeijten.bsky.social · Nov 22

Our biomechanical shoulder model now has full contact geometry, so the arm must navigate around the torso to reach behind...

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Thomas Geijtenbeek @tgeijten.bsky.social · Nov 19

See the link in my other reply

Thomas Geijtenbeek @tgeijten.bsky.social · Nov 19

D-Flow 🫶

Thomas Geijtenbeek @tgeijten.bsky.social · Nov 18

More information: sites.google.com/view/natural...

Natural Walking RL

Preprint

sites.google.com

Thomas Geijtenbeek @tgeijten.bsky.social · Nov 18

This uses a 30-dof model with 122 compliant musculotendon units, simulated using Hyfydy and trained using depRL. No motion data was used for training.

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Thomas Geijtenbeek @tgeijten.bsky.social · Nov 18

Now that Bluesky has native video support, I figured it's time for a repost: Teaching a biomechanical model to run using reinforcement learning.

New results coming soon! #BiomechSky