The productive discipline is subtractive. A world needs enough rules that its problems are specific and enough texture that it feels inhabited, and every element beyond that is a cost: to write, to design, to render, and to explain. The most common failure is a beautifully realised world in which nothing is difficult, because the rules were designed for richness rather than for pressure.
The rules that matter are the ones that constrain the protagonist. What is scarce, what is forbidden, what costs something. A world where magic works but exhausts the user generates story; a world where magic simply works generates art direction.
In generative production world-building has acquired a second, literal function: the world bible is the document the locks come from. Palette, light behaviour, materials, architecture and wardrobe rules written once and pasted into every prompt is what stops eleven shots from looking like eleven different worlds.
How much world-building does a story need?
Enough that the protagonist’s problems are specific and the setting feels inhabited. Beyond that it is cost. The rules worth writing are the ones that constrain somebody.
What does world-building have to do with AI production?
The world bible becomes the lock block: palette, light, materials, architecture and wardrobe rules written once and pasted into every prompt. It is what stops a sequence looking like several unrelated worlds.