s&box SaveSystem: Scene save/load with metadata and event hooks
SaveSystem API Reference SaveSystem is a GameObjectSystem that captures differences between the current scene state and the original scene, enabling save/load f…
Sound.Play and SoundHandle: 3D Audio, Volume, Pitch, Occlusion, UI Sounds, and Dedicated Server Behavior
Sound.Play and SoundHandle: Audio Playback in s&box is the static entry point for audio playback. is the returned handle for controlling a playing sound. Playin…
s&box Hotload System: How Code Reloading Works, SkipHotload, ConVar Persistence, and NetworkObject.OnHotload
s&box Hotload System: How Code Reloading Works s&box supports live code reloading (hotload) without restarting the game. Understanding how it works helps avoid …
SceneAnimationSystem: Threaded Animation, Bone Merge Order, Procedural Bones, and Ragdoll Physics Step
SceneAnimationSystem: Threaded Animation Updates and Bone Merge Order drives all animation updates. It runs at (after , before ). Threading Model Animation upda…
s&box IToolActionEvents: Tool action event interface
IToolActionEvents API Reference IToolActionEvents is a scene-wide interface for listening to toolgun actions before and after they execute. Type Signature Actio…
GameManager INetworkListener Pattern
GameManager INetworkListener Pattern Game manager implementing connection lifecycle with player spawning and cleanup. Implemented Interfaces INetworkListener - …
s&box SpeechLayer: NPC speech and subtitles
NPC behavior layer that manages speech state, plays sound files, and renders subtitle text above the NPC's head. Properties Methods Behavior Resolves a random s…
Component Interfaces: IDamageable, ICollisionListener, ExecuteInEditor
s&box provides several built-in component interfaces for physics, damage, networking, and editor execution. ExecuteInEditor Runs component methods (OnAwake, OnE…
PlayerController: Physics-Based Character with Events Interface
The component is a physics-based first/third person player controller. Add it to a scene and be running around with no programming required. Core Features Physi…
ISceneStartup: Host and Client Scene Initialization Events
is a scene event interface for listening to scene initialization on host and client. It runs when pressing play in editor, loading a game, or joining a server. …
NavMesh Links: Custom Agent Traversal with Jump, Ladder, and Physics Examples
NavMesh Links in s&box connect disconnected navigation areas, allowing agents to jump, climb ladders, or traverse gaps. Add a NavMeshLink component to a GameObj…
UI Style Properties: CSS Reference with Custom Pseudo-Classes and Sound Events
s&box UI styling follows web CSS conventions with some differences. Everything is flex by default. Key custom properties include / for hover/click sounds, , and…
Animation System: Animgraph, Skeletal Animation, IK, and Ragdolls
s&box uses Valve's Animgraph system for character animation, providing a powerful node-based animation state machine. Key Features Animgraph — node-based animat…
s&box SoundDefinition: Categorized sound GameResource
SoundDefinition GameResource API Reference SoundDefinition is a GameResource that defines a categorized sound for use on spawned entities (thrusters, hoverballs…
Sandbox.UI.Panel
Sandbox.UI.Panel Base class for UI panels. Overview Panel is the base class for all UI in s&box. Create panels using Razor (.razor) files or dynamically in code…
s&box NpcConVars: Global NPC AI settings
NpcConVars Static Class NpcConVars is a static class that defines console variables controlling global NPC AI behavior in s&box. These ConVars can be set via co…
GameManager.Spawn RPC with Ident Parsing
GameManager.Spawn RPC Broadcast RPC for spawning entities from string identifiers with automatic weapon pickup detection. Ident Format - Spawn a prop from asset…
s&box TimeSince and TimeUntil: Convenient Time Measurement Structs
s&box TimeSince and TimeUntil: Convenient Time Measurement Structs Both structs use internally and support implicit conversion from /. TimeSince Measures time e…
IDefinitionResource interface
IDefinitionResource Interface Interface for s&box game resources that have title and description metadata. Properties Title () - Display title for the resource …
Platform Chat: Built-in Text Chat with IChatEvent Filtering
s&box includes a built-in platform chat system for multiplayer games. Messages are routed through the host, validated, filtered via Steam's text filter, and dis…