[Home](./index.md) > [server](./server.md) > [Entity](./server.entity.md) > [spawn](./server.entity.spawn.md) ## Entity.spawn() method Spawns the entity in the world. Use for: placing the entity into a world so it simulates and syncs to clients. Do NOT use for: reusing a single entity instance across multiple worlds. **Signature:** ```typescript spawn(world: World, position: Vector3Like, rotation?: QuaternionLike): void; ``` ## Parameters

Parameter	Type	Description
world	[World](./server.world.md)	The world to spawn the entity in.
position	[Vector3Like](./server.vector3like.md)	The position to spawn the entity at.
rotation	[QuaternionLike](./server.quaternionlike.md)	_(Optional)_ The optional rotation to spawn the entity with. \*\*Requires:\*\* Entity must not already be spawned. \*\*Side effects:\*\* Registers the entity, adds it to the simulation, and emits `EntityEvent.SPAWN`. \*\*Category:\*\* Entities

**Returns:** void ## Remarks \*\*Rotation default:\*\* If no rotation is provided, entity spawns with identity rotation facing -Z. For Y-axis rotation (yaw): `{ x: 0, y: sin(yaw/2), z: 0, w: cos(yaw/2) }`. Yaw 0 = facing -Z. \*\*Auto-collider creation:\*\* If no colliders are provided, a default collider is auto-generated from the model bounds (or block half extents). Set `modelPreferredShape` to `ColliderShape.NONE` to disable. \*\*Collision groups:\*\* Colliders with default collision groups are auto-assigned based on `isEnvironmental` and `isSensor` flags. Environmental entities don't collide with blocks or other environmental entities. \*\*Event enabling:\*\* Collision/contact force events are auto-enabled on colliders if listeners are registered for `BLOCK_COLLISION`, `ENTITY_COLLISION`, `BLOCK_CONTACT_FORCE`, or `ENTITY_CONTACT_FORCE` prior to spawning. \*\*Controller:\*\* If a controller is attached, `controller.spawn()` is called after the entity is added to the physics simulation. \*\*Parent handling:\*\* If `parent` was set in options, `setParent()` is called after spawn with the provided position/rotation.