function divide(a, b, dst) {
    dst = dst || new VecType(3);

    dst[0] = a[0] / b[0];
    dst[1] = a[1] / b[1];
    dst[2] = a[2] / b[2];

    return dst;
  }
Divides a vector by another vector (component-wise); assumes a and
b have the same length.
@param {module:twgl/v3.Vec3} a Operand vector.
@param {module:twgl/v3.Vec3} b Operand vector.
@param {module:twgl/v3.Vec3} [dst] vector to hold result. If not new one is created..
@return {module:twgl/v3.Vec3} The vector of quotients of entries of a and
    b.
@memberOf module:twgl/v3