PixiJS exposes lightweight math primitives (Point, Matrix, shape classes) used throughout the library for transforms, hit testing, and coordinate conversion. Import to add vector operations (add, dot, magnitude, reflect) and Rectangle intersection/union helpers. Quick Start Related skills: (transform properties), (hitArea usage), (culling with Rectangle). Core Patterns Point and ObservablePoint Point is a simple {x, y} value type. ObservablePoint fires a callback when x or y changes; it is used internally by Container's position, scale, pivot, origin, and skew. Container properties like , , ,…