unsafe-buffer-read-write.cs

    public static unsafe byte[] WriteVectorBuffer(ref Vector3 vec)
    {
        Span<byte> buffer = stackalloc byte[sizeof(Vector3)];

        fixed (byte* b = buffer)
            Unsafe.Write(b, vec);

        return buffer.ToArray();
    }

    public static unsafe Vector3 ReadVector(Span<byte> buffer)
    {
        fixed (byte* b = buffer)
            return Unsafe.Read<Vector3>(b);
    }