Keep track of last game like bike rivals.

Muhammad_Taha · Nov 13, 2018

Hi,
I just want some suggestions. I want to keep track of last played game style and when I play the level again it shows me my player movements.

Here is a reference. I thought of doing it through rewind time. But it seems like costly process. so better suggestions. For rewind time I again watch toturial of breckeys.

so new ideas.

LeftyRighty · Nov 13, 2018

https://forum.unity.com/threads/ghost-replay-function.521824/#post-3424658

JoeStrout said: ↑

There are only two practical possibilities: either record the position and state of the game objects, or record the inputs and recalculate all the motion & state from that (which requires that your controller code is absolutely repeatable).

If it were me, I'd probably record the position and state for each frame. You say this is overkill, but is it really? Let's say you use a struct containing XY position (8 bytes) and some sort of state number (4 bytes; I assume you get this from your controller state machine, and it's enough to imply which sprite to show, when to spawn a bullet, etc.). That's 12 bytes per frame. If a run is 3 minutes long at 60 fps, that's 10,800 frames, or about 126k of data. No big deal.

Or you go with the other approach, recording the inputs. In this case you only need to add an entry to your record when the inputs change, which is probably not every frame. But in this case you must be very, very careful that your controller plays out exactly the same every time, or small errors will accumulate and could end up resulting in a completely different outcome (like your ghost getting stuck behind an obstacle that should have been cleared). That means no physics, no multiplying by Time.deltaTime; everything has to be done on a frame-by-frame basis, old school.

It is possible to do a sort of hybrid approach that replays from inputs, but includes a "sync" frame every so often (say, once per second), with a full record of the state at that point. This prevents errors from accumulating, and even if the ghost gets stuck, it will be only temporary. The drawback of course is that if such events happen, the player will notice the ghost jumping from point to point in an unnatural manner.
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Muhammad_Taha · Nov 13, 2018

Thanks. Seems like it will work. will try and let other knows. Thanks again.

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