12#include "libmesh/point.h"
RayDirectionMode
How the ray-casting engine obtains its shooting direction.
@ USER_SPECIFIED
The engine uses the caller-supplied direction exactly, with no auto-selection.
@ AUTO_PCA
The engine auto-selects a robust direction via PCA (may use a fallback).
Ray-direction intent for AdaptiveRayContainmentCheck: an explicit mode plus the direction to use when...