Class NullPhysicsWorldAlpha

A no-op physics backend. The PhysicsWorld base class is a functional no-op - bodies, shapes and joints are created but inert, raycasts miss and stepping does nothing - so this subclass adds nothing. It exists to let physics component lifecycle run without a physics engine loaded, and is installed explicitly:

const options = new AppOptions();
options.physicsWorld = new NullPhysicsWorld();
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It is never auto-selected - without it, an application with no physics library keeps the default behavior where physics components are inert placeholders.