SbVec4d(3) on Linux
The text c15f648af281, as Debian 8 (Jessie) shipped it.
The SbVec4d class is a 4 dimensional vector with double precision floating point coordinates. This vector class is not by many other classes in Coin. It provides storage for a 3 dimensional homogeneoues vector (with the 4 components usually referred to as <x, y, z, w>) aswell as simple double precision floating point arithmetic operations.