Mouse movement does not feel smooth in the game. Any fixes?

By default game runs with mouse acceleration enabled. In some cases acceleration can be disabled by alt+tabbing to the desktop and then back to the game. If that does not help, you can try different values of the in_mouse console command. Console can be entered by using the ~ key.

in_mouse 3 - Raw Input
in_mouse 2 - Direct Input

You then need to enter in_restart to restart the input mode.

in_restart doesn't work, it just makes the character say "in_restart"

I've also tried putting in_mouse 3 in autoexec.cfg but it still doesn't work.

Is there really no way to remove mouse acceleration? It's a deal breaker in an otherwise great game...

I could not get it to work either.

I would like to bump this. The console commands *do not work*. The command "in_restart" is not at all recognized by the game.

The game is great, but mouse acceleration completely breaks raw, direct control of aiming and communicating reflexes and skill through the input, thus making it unnecessarily frustrating and handicapped to play on the hardest difficulty, which should be the properly challenging way to play a FPS. If I need to play on a lower difficulty, just because I've been turned into a special-needs child whose biggest enemy is moving around in the first place, it's like I might as well not play anyway, because I'm actually constantly conscious of the fact that I could and should be doing much better. I guess a FPS is just not designed to have you worry about the mouse being an enemy rather than the actual AI and mechanics they have carefully developed. It baffles me that older, challenging games like this even have forced acceleration like that. Like are devs playing like that or...?
/Rant

Agreed with all the above, I finally got to try this game and the acceleration is horrible, it is indeed a deal breaker. Like stated above, "in_restart" does absolutely nothing, it either gives an error message or it acts like a player chat. I've tried "set in_mouse 3" or "set in_mouse 2" , those commands appear to be accepted by the console but still do nothing; each one feels exactly the same as in_mouse 1. I've tried editing the config files (for each player, including "blade", in both the "base" and "2015" folders as I'm using the SiN Ultimate Patch), tried editing the autoconfigs, nothing works.

"in_mouse 3" or whatever is actually in C:\games\Sin Gold\base\players\<yourname>\config.cfg and does jack shit.
Bummer, can't play a shooter with mouse acceleration. Next!

It's the "mouse filter" option in the game options menu. Setting on 2 worked for me.

edit: TLDR at the bottom, where the fix is mentioned.



old thread, and probably too late for most of you,
but this (acceleration) is a known issue with older id tech engines:

these game engines force the use of the windows acceleration curve, regardless of your settings.
for example in windows 7 you will find the option "Enhanced Pointer Precision" in the mouse settings,
but even if you have unchecked this box, these old game-engines will use whatever that setting refers to.

and don't be fooled - these old engines do not offer raw input.
i am fairly sure that in_mouse 2 and in_mouse 3 do absolutely nothing. "back in the day", in_mouse was nothing but an on-off switch.
m_filter controls mouse smoothing/averaging, and does not control or affect acceleration.



anyway - if you are suffering from acceleration, what you want is the "MarkC fix". this is a universal fix for all games that suffer from this specific acceleration problem. this is a partial list of games that share this issue.

the above mentioned fix is a small and simple registry edit that flats this acceleration curve out, to be linear. this means that even though these old engines call this function, this fix has made sure that it no longer acts as acceleration.



TLDR: MarkC Acceleration Fix. it's quick and easy to install, and also quick and easy to undo.

Try

set m_noaccel "1"

In your config.cfg and autoexec.cfg

m_noaccel "1" seems to have worked for me.