🪐 Spaceplate

Svelte 5 + Threlte + SpacetimeDB boilerplate for real-time 3D web apps

Example Games:

⚔️ TheRite

⚔️ JustSurvive

⚔️ MouseHole

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A minimal, opinionated boilerplate that wires together a Svelte 5 frontend, a Threlte 3D scene, and a SpacetimeDB real-time backend — so you can skip the setup and start building.

What's included

• Scene Manager — Application state machine (mainMenu / demoScene) with animated transitions, per-scene HUD routing, and a preset assignment system for PP/skybox
• Task Scheduling — Threlte-based render pipeline with ordered stages:
  • physicsStage — Game logic (typically runs in demoScene, pauses in menus)
  • renderStage — 3D rendering (default)
  • uiStage — UI updates (after render)
  • audioStage — Audio (always runs)
• Input System — Action-based keyboard/mouse/gamepad mapping with per-player bindings, rebinding UI, and localStorage persistence
• Studio Extensions (VITE_GAME_ENGINE=true) — Threlte Studio toolbar panels:
  • SceneExtension — Scene switcher + preset manager (assign PP/skybox presets per scene or globally)
  • PostProcessingExtension — 25+ effects, preset save/load/update, bundled presets, conflict detection
  • SkyboxExtension — Sky/stars presets, animated transitions, environment textures, user presets
  • SoundExtension — Volume controls + audio channel toggles
  • LoggerExtension — Per-channel log toggles (engine, settings, sound, postprocessing, skybox, cache, gltf, physics, input)
  • GltfViewerExtension — Load GLTF/GLB from file or path; inspect animations and colliders in demoScene
  • PhysicsExtension — Rapier world controls, spawn defaults, attractor controls, and quick body spawning
• Sound system — Polyphonic + one-shot audio, never unmounts, safe from race conditions
• Settings — Tabbed settings HUD (General / Audio / Controls) — all persistent via localStorage
• Physics sandbox — @threlte/rapier world wiring, debug collider toggle, attractor modes, and spawnable balls/boxes
• SpacetimeDB wiring — Connection setup, generated bindings, example table subscription
• Debug logging — Multi-channel styled logging with timestamp; channels auto-generate Studio UI checkboxes
• TailwindCSS — Utility-first CSS framework via @tailwindcss/vite

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Task Scheduling

import { useGameTasks } from '$core/tasks';

const { createPhysicsTask, createUiTask } = useGameTasks();

// Physics only runs in demoScene
createPhysicsTask((delta) => {
  // Update game objects
});

// UI runs in all scenes
createUiTask((delta) => {
  // Animate UI
});

Input System

Action-based input that works in production without any editor tooling.

import { inputQueries, advanceInputFrame } from '$extensions/input/input.svelte';

// In a frame task
createPhysicsTask((delta) => {
  advanceInputFrame(); // advance wasPressed edge detection

  const { x, y } = inputQueries.getMoveVector('player1');
  if (inputQueries.wasPressed('player1', 'jump')) { /* ... */ }
  if (inputQueries.isPressed('player1', 'sprint')) { /* ... */ }
});

Default player1 bindings out of the box:

Keys	Action
W A S D / Arrows	Move
Space	Jump
Shift	Sprint
E	Interact
LMB / Q	Primary / Secondary
R F C X Z T	Reload / Use / Crouch / Drop / Prone / Emote
1 2 3 4	Slots
Esc	Pause

Players can rebind everything from the in-game Settings → Controls tab.

Extensions

Each extension is self-contained: reactive state (.svelte.ts), actions, and an optional Studio UI panel (dev only).

extensions/
├── scene/              # Scene state machine + preset assignment system
├── settings/           # Persistent audio/graphics/general settings
├── input/              # Action-based input mapping, bindings, queries
├── postprocessing/     # 25+ effects, presets, bundledPresets.ts
├── skybox/             # Sky + stars presets, envTextures.ts, bundledPresets.ts
├── sound/              # Positional audio state
├── logger/             # Multi-channel styled logging
├── gltf-viewer/        # GLTF/GLB loader, animation controls, collider toggles (dev only)
└── physics/            # Rapier world state, attractor, debug controls, spawnable bodies

State always works in production — Studio panels are purely dev-time UI on top of the same state.

Physics

The boilerplate includes a ready-to-tweak Rapier sandbox inside the demo scene.

• World controls for gravity, framerate, and debug colliders
• Spawn defaults for restitution, friction, damping, CCD, sleep, and random spawn positions
• Attractor controls with static, linear, and newtonian gravity falloff
• Quick body spawning via physicsActions.spawnBall() / spawnBox()
• Leaving demoScene clears spawned physics bodies automatically

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Getting Started

# install dependencies
npm install

# run dev server
npm run dev

# build for production
npm run build

SpacetimeDB

# start local SpacetimeDB server
spacetime start

# publish module (local)
npm run spacetime:publish:local

# publish module (local, wipe db)
npm run spacetime:publish:local:fresh

# publish module (maincloud)
npm run spacetime:publish

# regenerate client bindings after schema changes
npm run spacetime:generate

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Configuration

Copy .env.example to .env.local and fill in your values.

Variable	Description
VITE_SPACETIMEDB_DB_NAME	Your SpacetimeDB database name
VITE_SPACETIMEDB_HOST	SpacetimeDB host (https://maincloud.spacetimedb.com for maincloud)
SPACETIMEDB_DB_NAME	Same as above, used by the spacetime CLI
SPACETIMEDB_HOST	Same as above, used by the spacetime CLI
VITE_GAME_ENGINE	true to enable Threlte Studio + PerfMonitor + all Studio extensions