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Terra-jin

Exactly how fast are fast monsters?

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The DOOM Wiki says Demons are two times faster, Imp fireballs are 50% faster, and Caco and Baron fireballs are 33% faster.

Since the speed of Imp, Caco and Baron fireballs are 10, 10 and 15 respectively, the -fast parameter should make them 15, 13 and 20.
I found this to be incorrect, because the DOOMguy is able to outrun fireballs with speed 13 or 15, while it is actually impossible to outrun -fast missiles.

So my question is: exactly how fast are the various fireballs with the -fast parameter?

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Demons gets 1 tic for each running frame, 4 tics for each attack frame, 2 tics for each pain frame. Imp, Baron and Cacodemon fireballs all get to speed 20.

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About speed...

Some time ago, I played Doom with -fast parameter. I saved a game, died & loaded the game. Then, a demon gets crazy: it moves so fast that you can't see it. Somehow loading the savegame caused the demon speed increase rapidly. I made a test wad including cyberdemon and a demon. I made a savegame and loaded it a couple of times (with "fast monsters" on). Then I made the cyberdemon hit the demon with a rocket. The result: the player & cyberdemon die instantly.

Is this a known phenomenon?
Exactly how fast are these "super fast" monsters?

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What exe (and which version of it) were you using?

Some ports and the original exes have had some issues with -fast and saves, but I thought the problem was more that they forgot the skill level, rather than what you describe.

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In vanilla Doom 2 v1.9 it:

a) forgets about -fast, Edit: if you start the game without -fast, even if the save is from a -fast game.

b) crashes the game when you wake up a demon/spectre (like in map03). Edit: after further testing, this happens if you start the game with -fast, load a saved game and encounter a demon/spectre.

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In my opinion, this is the 2nd craziest bug in Doom. Those super fast demons come from hell, that's for sure.

Edit: As far as I can tell, the game crashes only if the super fast demon/spectre does not have direct access to the player.
Edit: Oh, I just remembered that I once managed to pause when a super fast demon was on the run. Only it's legs were visible! :)

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Belial said:

b) crashes the game when you wake up a demon/spectre (like in map03). Edit: after further testing, this happens if you start the game with -fast, load a saved game and encounter a demon/spectre.


This happens also if you set all of the Demon's walking frames' durations to 1 and play a fast game. Normally, the value of 2 is halved; the game crashes because it cannot handle durations of 1/2.

I guess saving a game halves the durations before the -fast parameter and when you load it again with -fast the game crashes due to values of less than 1.

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See this for information on running speeds.

But note that running/walking is really an acceleration, so the speeds given here are actually the terminal velocities generated by this acceleration taking into account the friction the player encounters in-game.

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