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[Home](./index.md) > [server](./server.md) > [Simulation](./server.simulation.md) ## Simulation class Represents the physics simulation for a world. When to use: advanced physics queries, custom gravity, or debug rendering. Do NOT use for: typical movement; use entity/rigid body APIs instead. **Signature:** ```typescript export default class Simulation extends EventRouter ``` **Extends:** [EventRouter](./server.eventrouter.md) ## Remarks Access via `World.simulation`. The simulation drives all collision and contact events for blocks and entities. <h2>Events</h2> This class is an EventRouter, and instances of it emit events with payloads listed under `SimulationEventPayloads`. \*\*Category:\*\* Physics The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `Simulation` class. ## Properties <table><thead><tr><th> Property </th><th> Modifiers </th><th> Type </th><th> Description </th></tr></thead> <tbody><tr><td> [gravity](./server.simulation.gravity.md) </td><td> `readonly` </td><td> RAPIER.Vector3 </td><td> The gravity vector for the simulation. \*\*Category:\*\* Physics </td></tr> <tr><td> [isDebugRaycastingEnabled](./server.simulation.isdebugraycastingenabled.md) </td><td> `readonly` </td><td> boolean </td><td> Whether debug raycasting is enabled. \*\*Category:\*\* Physics </td></tr> <tr><td> [isDebugRenderingEnabled](./server.simulation.isdebugrenderingenabled.md) </td><td> `readonly` </td><td> boolean </td><td> Whether debug rendering is enabled. \*\*Category:\*\* Physics </td></tr> <tr><td> [timestepS](./server.simulation.timesteps.md) </td><td> `readonly` </td><td> number </td><td> The fixed timestep for the simulation. \*\*Category:\*\* Physics </td></tr> <tr><td> [world](./server.simulation.world.md) </td><td> `readonly` </td><td> [World](./server.world.md) </td><td> The world this simulation belongs to. \*\*Category:\*\* Physics </td></tr> </tbody></table> ## Methods <table><thead><tr><th> Method </th><th> Modifiers </th><th> Description </th></tr></thead> <tbody><tr><td> [enableDebugRaycasting(enabled)](./server.simulation.enabledebugraycasting.md) </td><td> </td><td> Enables or disables debug raycasting for the simulation. </td></tr> <tr><td> [enableDebugRendering(enabled, filterFlags)](./server.simulation.enabledebugrendering.md) </td><td> </td><td> Enables or disables debug rendering for the simulation. </td></tr> <tr><td> [getContactManifolds(colliderHandleA, colliderHandleB)](./server.simulation.getcontactmanifolds.md) </td><td> </td><td> Gets the contact manifolds for a pair of colliders. </td></tr> <tr><td> [intersectionsWithRawShape(rawShape, position, rotation, options)](./server.simulation.intersectionswithrawshape.md) </td><td> </td><td> Gets the intersections with a raw shape. </td></tr> <tr><td> [raycast(origin, direction, length, options)](./server.simulation.raycast.md) </td><td> </td><td> Casts a ray through the simulation and returns the first hit. </td></tr> <tr><td> [setGravity(gravity)](./server.simulation.setgravity.md) </td><td> </td><td> Sets the gravity vector for the simulation. </td></tr> </tbody></table>