Fixed size vector products

Vector dot product (scalar product) is compute using the alternatives

      ds = gan_vec3_dot_q ( &v3x, &v3y ); /* macro, or */
      ds = gan_vec3_dot_s ( &v3x, &v3y ); /* function call */

Similarly, to compute the squared length of a 3-vector, use

      ds = gan_vec3_sqrlen_q ( &v3x ); /* macro, or */
      ds = gan_vec3_sqrlen_s ( &v3x ); /* function call */

For 3-vectors only we also have the cross product (vector product)

      gan_vec3_cross_q ( &v3x, &v3y, &v3z ); /* macro */
      v3z = gan_vec3_cross_s ( &v3x, &v3y ); /* function call */

There are also outer products formed by two vectors, producing a matrix. These functions are described in Section 3.1.2.7.