Intermission Demo playback fix?

[Baker]

[ericw]

Thanks for sharing this Baker.

I'd like to understand what's going on better though. I can reproduce it using only winquake 1.09 (record demo, map e1m1, noclip to the exit, then play the demo. intermission camera is pointing at the wrong angle), so it looks like a bug in the original code. Weirdly, one recording attempt produced a demo that plays back correctly (every time I play that particular demo file). So there appears to be some randomness to it at recording time.

[Baker]

It is an interesting question for sure.

I independently discovered the solution, then I found Bengt Jardrup had a similar fix in his engine to the problem (of course written like 8 years ago or so). I've recorded and played back numerous demos including ones recorded in other engines and I have found to situation where the above fix doesn't work.

But I'm not sure of the exact cause, but it only seems to affect engines which can read short angles. Might be similar to the APSP1 func_train issue in that sense.

Has to be something wrong with reading the data, but could be something with QuakeC that only reveals itself in this odd circumstance or something about how demo recording works.

[qbism]

Is this similar to the bug with savegames facing the wrong direction when loaded?