I'm making my first real mod. I have made some crafting recipes. But I want to add a condition: The player must have read a book before being able to craft the recipes.

Is this possible in any way?

Thanks in advance

A hint may be found in the Skill Book scripts, as that checks to see if you have read a particular skill book before it gives you the skill point, so you only get the skill point once per title. Not sure if the script is different for each book, or it looks a flag the game set when you read it the first time.

But, this could be modified to work with the various recipe books that are in the game now, or the ones that you are making.