PointContainmentClassifier

PointContainmentClassifier is a thin facade that unifies the point-containment backends behind a single API and result type (SurfaceSide). Given a builder-owned surface mesh and, for the ray-casting methods, a SurfaceElementSet, it constructs exactly one backend and dispatches sideness() and contains() to it:

• pca_ray and user_selected_ray construct a AdaptiveRayContainmentCheck (ray-casting engine), differing only by the ray direction passed in;

• fixed_x_ray constructs a TriangleManifold engine (fixed +x ray, 3-D TRI3 surfaces only).

The facade adds no geometry logic of its own beyond backend selection, the uniform contains() mapping (INSIDE and ON both map to true), and routing of the boundingBox() and numElements() accessors to the constructed backend. It is the object owned by PointInPolyhedronCheckUO; callers never touch the individual backends directly.