Return value of
{@link #findClosestPointOnTriangle(double, double, double, double, double, double, double, double, double, double, double, double, Vector3d)},
{@link #findClosestPointOnTriangle(Vector3d, Vector3d, Vector3d, Vector3d, Vector3d)},
{@link #findClosestPointOnTriangle(double, double, double, double, double, double, double, double, Vector2d)} and
{@link #findClosestPointOnTriangle(Vector2d, Vector2d, Vector2d, Vector2d, Vector2d)} or
{@link #intersectSweptSphereTriangle}
to signal that the closest point is the first vertex of the triangle.
Return value of {@link #findClosestPointOnTriangle(double, double, double, double, double, double, double, double, double, double, double, double, Vector3d)}, {@link #findClosestPointOnTriangle(Vector3d, Vector3d, Vector3d, Vector3d, Vector3d)}, {@link #findClosestPointOnTriangle(double, double, double, double, double, double, double, double, Vector2d)} and {@link #findClosestPointOnTriangle(Vector2d, Vector2d, Vector2d, Vector2d, Vector2d)} or {@link #intersectSweptSphereTriangle} to signal that the closest point is the first vertex of the triangle.