struct PathfindRequest {
  enum ERequestType {
    TYPE_ACTOR,
    TYPE_RAW
  };
  ERequestType type;
  unsigned startIndex;
  unsigned endIndex;
  Vec3 startPos;
  Vec3 startDir;
  Vec3 endPos;
  Vec3 endDir;
  bool bSuccess;
  IAIPathAgent * pRequester;
  int nForceTargetBuildingId;
  bool allowDangerousDestination;
  float endTol;
  float endDistance;
  bool isDirectional;
  bool bPathEndIsAsRequested;
  int id;
  IAISystem::tNavCapMask navCapMask;
  float passRadius;
  PathfindingExtraConstraints extraConstraints;
};

IPathfinder.h

enum ERequestType {
  TYPE_ACTOR,
  TYPE_RAW
};

IPathfinder.h

bool allowDangerousDestination;

bool bPathEndIsAsRequested;

This gets set to false if the path end position doesn't match the requested end position (e.g. in the event of a partial path, or if the destination is in forbidden)

bool bSuccess;

Vec3 endDir;

endDir magnitude indicates the tendency to line up at the end of the path - magnitude should be between 0 and 1

float endDistance;

unsigned endIndex;

Vec3 endPos;

float endTol;

PathfindingExtraConstraints extraConstraints;

int id;

bool isDirectional;

as a result of RequestPathInDirection or RequestPathTo

IAISystem::tNavCapMask navCapMask;

int nForceTargetBuildingId;

float passRadius;

IAIPathAgent * pRequester;

Vec3 startDir;

unsigned startIndex;

Vec3 startPos;

ERequestType type;

void GetMemoryUsage(ICrySizer * pSizer) const;

PathfindRequest(ERequestType type);

void Serialize(TSerialize ser);

Callable only inside the AISystem module. It's implemented there.