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[deleted] t1_iy8xwei wrote

Reply to comment by dmootzler in ELI5: How can we fit entire 3D open world games on such small devices? by fernando_favela

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dmootzler t1_iy8yp7m wrote

That doesn’t sound right.

Finding the seed that yields a specific world plus a specific set of user changes would require a brute force search of all possible seeds, which is completely infeasible.

Even if you could do it, the encoding would be no more space-efficient than an optimally-compressed diff.

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Fwahm t1_iy9tegi wrote

No, as there are many world-states that don't correspond to any seeds because not all possible states can be baseline in a seed.

It's more like keeping the title of the story the same, but you also hand them a piece of paper with instructions for them to apply modifications to the story after they finish generating it. "Change John's name to Joe", or "Megan died of influenza instead of pneumonia", for example.

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Shaddaa t1_iy8zaqq wrote

If I got your analogy than that is not true, not every possible world has an associated seed, there are far more possible worlds than there are possible seeds.

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[deleted] t1_iy90ag4 wrote

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Shaddaa t1_iy90w2d wrote

To me your analogy sounds like changes to the world (=story) are saved by changing the seed (=title) to a seed which generates the changed world. But there is no seed that will generate a world with my oak plank house in it. Maybe I just got your analogy wrong, I believe we both mean a similar thing.

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dmootzler t1_iy9azry wrote

Ahh I think you misunderstood my original question. I wasn’t asking about how user-specified seeds are handled.

What I meant was, when I mine/build/craft, altering the state of the world, how is that new world state persisted (since the results of my actions would not be present in the procedurally generated chunk)?

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