Browser-based robot simulator with Three.js and rapier.js
Browser-based robot simulator with Three.js and rapier.js launched on April 30, 2023 with 13 votes, #1,634 of 4,853 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
This browser-based robot simulator uses Three.js for graphics and rapier.js for physics simulation. Users can design and test virtual robots directly in their web browser without installing software. It's aimed at hobbyists and students interested in robotics, engineering, or physics simulations. The simulator runs entirely online, making it accessible for anyone wanting to experiment with robot design and behavior in a 3D environment.
written from the facts on this page · September 2026
From the sources
While learning more about embodied AI and robot simulation i’m building a simple simulator, based on Three.js and Rapier physics engine . The robot model is a mobile platform with a 6DOF manipulator and a 2-finger gripper. Each part of the robot is a three.js mesh, kept in sync with the Rapier rigid body. Parts are connected into a kinematic chain with Rapier joints. Arm pose can be set by dragging the gripper with three.js TransformControls. Surprisingly, inverse kinematics works just based on physics simulation, without the need for an additional explicit solver. Initially, I assumed that adding inverse kinematics would be the hardest part of the project, so it’s nice that it comes for…from grgv.xyz
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Source: Show HN post ↗
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