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Describe a system. tplus1 builds it, runs it in the browser, and keeps every part editable.

Create a simulation Explore

Three simulation types

Choose the right runtime.

Use custom code or built-in Rapier physics in two or three dimensions.

custom-js

Custom

Author the simulation loop and presentation directly for bespoke interactive experiences.

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rapier2d

Rapier 2D

Fast 2D rigid-body simulations with colliders, sensors, joints, and collision events.

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rapier3d

Rapier 3D

Interactive 3D rigid-body worlds with joints, sensors, raycasts, and custom step logic.

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Examples

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Procedural & Generation

Ancient River Forest — 1 km²

A seed-grown kilometre-square old-growth forest split by a winding river and sealed inside a ring of unclimbable mountains. Every hill, bank, tree, fern, stone, bark pattern, and water ripple is procedural.

3D Rigid Body Chaos

A high-performance demonstration of 3D physics using Rapier. Thousands of rigid bodies interacting in real-time, calculated via WebWorker and rendered natively with WebGL.

3D Parkour Sandbox

Use WASD keys to roll the ball. Jump across platforms and don't fall off! Full 3D interactivity.

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