vec3f

public struct Vec3f
    {
        public float x, y, z;

        // ...

        public unsafe static explicit operator byte[](Vec3f s)
        {
            var bts = new byte[12];
            var ps = &s;
            var btsp = (byte*) ps;
            for (var i = 0; i < 12; i++)
                bts[i] = btsp[i];
            return bts;
        }
        public unsafe static explicit operator Vec3f(byte[] bts)
        {
            fixed (byte* btsp = &bts[0])
            {
                return *(Vec3f*)btsp;
            }
        }
    }