Any interest in a templatized class for 3-Dimensional vectors? (Similar in style to std::complex or boost math/octonion and math/quaternion.) The most recent uses I have had for it are in ray tracing of scattered light through an experimental setup, and in calculating the bending parameters for a pipe of a certain shape. Basic Features: Constructor and component access. Addition and subtraction of vectors. Multiplying and dividing vectors with scalers. Dot and Cross products of vectors. Length (norm) calculation an conversion to unit vectors. Stream I/O. More Advanced Features: Spherical coordinates Cylindrical coordinates Rotations (around principle axes and general axes) Reflection by a surface Refraction across an interface (Snell's law). Rotations are specified by the axis about which the rotation is to be done, and the angle through which to rotate. There is no support for general rotation matrices. What do you think? Stefan