Core engine

simvx.core is SimVX with no renderer attached: the node system, the scene tree and every gameplay system. It runs headless, so pip install --pre simvx-core alone is enough for simulation, servers and tests.

Subsystems

System	Guide	Description
Nodes	Node system	Scene tree hierarchy, lifecycle, properties, signals, groups, coroutines
Input	Input	Actions, keyboard, mouse, controller, and touch
Animation	Animation	Tweens, sprite sheets, keyframe clips, state machines
Audio	Audio	2D/3D spatial audio, buses, resource caching
Assets	AssetServer	Asynchronous loading by group, folder or manifest, with a memory budget
UI	UI system	Controls, containers, theming, focus management
Fonts	Fonts and languages	Choosing a typeface, fallback fonts for other scripts, missing-glyph boxes
Math	Math types	Vec2, Vec3, Quat and matrix functions, all NumPy
Physics	Physics	Rigid bodies, character controllers, areas, joints, spatial queries (2D + 3D)
Scenes	Scenes	Python scene files, prefab classes, refactoring, change_scene
Particles	Particles	Particle emitter with CPU and GPU simulation modes
TileMap	TileMap	Grid-based 2D level design with auto-tiling
2D Lighting	2D lighting	Point lights, directional lights, shadow occluders
CSG	Constructive solid geometry	Constructive solid geometry (boolean mesh operations)
Navigation	Navigation	A* pathfinding (graph and grid) with steering agents
Navigation 3D	3D navigation	3D navigation meshes and pathfinding
Skeleton	Skeleton	Bone hierarchy and joint matrices for GPU skinning
Physics Backends	Physics Backends	The built-in solver, pymunk for 2D and Jolt for 3D; choosing one
WorldEnvironment	WorldEnvironment	Post-processing, sky, fog, tonemap, AA, custom effects
Testing	Testing	Headless scene runner, input simulation, UI test harness
Windowing	Windowing backends	SDL3, GLFW and Qt: what each supports and how one is chosen

API reference

See simvx.core for the complete API.