I would like to get started in tools development, the problem is I have no idea where to start. I looked at this book called Game Engine Toolset Development but I'm not sure if it is the best place to help you build a tool from scratch. Any other suggestions?
My goal would be to build a tool where you could visualize different water simulations with different LODs, etc.
That's not really a tool, that's more like a simulation.
What you need to do, is find a job/task that needs to be done. A tool is a program that will help you do it quicker. Just say you have a small game and it reads small scripts that describe different events. A good tool to have would be one which allows you to write these scripts (most likely in a format easier than the actual script syntax) and then save them in a format so they can be read by the game.
So to create a tool, you need to have a job that needs to be done better than it currently is.
I see. Thanks :)
But do you know any sources where I can read more about this subject, apart from the book mentioned above?
Tools development seems to be one of the least explored areas in game dev literature.