rec.autos.simulators

GPL newbie - force feedback

Frankie Hower

GPL newbie - force feedback

by Frankie Hower » Mon, 04 Jun 2001 02:09:43

I'm new to GPL, and I'm tinkering with the FF settings, trying to get things
'right'. I have the new Logitech FF GP. The machine is a Celery 400, V3
3000, 160MB ram. My frame rate holds pretty steady at 36fps. These settings
work pretty well -
force_feedback_damping = 40.000000
force_feedback_latency = 0.085000
max_steering_torque = 225.000000,
and in the windows controller panel overall effects, spring effect and
damper effect are all set to 100%, with the centering spring disabled.

The problem I'm having is when I straighten up after a turn - the steering
rocks back and forth, gently, but noticeably, like the car is fishtailing
coming out of the turn. I'm trying to work out how much of this effect is
the natural effect of driving a 1967 GP beast, how much may be due to
incorrect FF setup, and how much is simply due to my poor techinque.

So, when taking the default setup for a given car, what can I change in the
setup to reduce this fishtailing of the car, and any suggestions in related
improvements to the FF settings?

Juan Vizos

GPL newbie - force feedback

by Juan Vizos » Mon, 04 Jun 2001 02:39:47

Looks like the damping could be backed off a bit mate...  try a higer
number...    higher = lower in gpl land :-)
<snippd>
SpeedFree

GPL newbie - force feedback

by SpeedFree » Mon, 04 Jun 2001 04:08:21

It would be that your torque is too high, (I use 210 rather than 225 on my
LWFF wheel). But it could also be your latency figure. This can cause
fishtailing because the latency synchonises the on-screen action with the
forces in the wheel. If it isn't correct, everything feels wrong, as you try
to correct forces either too far in advance or too late.

A good way to set the latency figure is to find a nice kerb and slowly drive
backwards and forwards over it DIAGONALLY. This way you get 4 "bumps" as the
4 wheels go over the kerb at different times. Once the latency figure is set
correctly you should lose the fishtailing effect.

Lol SF.

Thom j

GPL newbie - force feedback

by Thom j » Mon, 04 Jun 2001 06:43:50

Go to this site and have a looksie about settings for your FF wheel
and more. http://www.slottweak.com/ then Go down to Misc. and
Comrtoller And Game Settings..
I think you will find your Logitech FF GP wheel here? Gary D aka
GTX_SlotCar has one great site... Hope this helps? Thom_j.

| I'm new to GPL, and I'm tinkering with the FF settings, trying to get
things
| 'right'. I have the new Logitech FF GP. The machine is a Celery 400, V3
| 3000, 160MB ram. My frame rate holds pretty steady at 36fps. These
settings
| work pretty well -
| force_feedback_damping = 40.000000
| force_feedback_latency = 0.085000
| max_steering_torque = 225.000000,
| and in the windows controller panel overall effects, spring effect and
| damper effect are all set to 100%, with the centering spring disabled.
|
| The problem I'm having is when I straighten up after a turn - the steering
| rocks back and forth, gently, but noticeably, like the car is fishtailing
| coming out of the turn. I'm trying to work out how much of this effect is
| the natural effect of driving a 1967 GP beast, how much may be due to
| incorrect FF setup, and how much is simply due to my poor techinque.
|
| So, when taking the default setup for a given car, what can I change in
the
| setup to reduce this fishtailing of the car, and any suggestions in
related
| improvements to the FF settings?
|
|

Gregor Vebl

GPL newbie - force feedback

by Gregor Vebl » Mon, 04 Jun 2001 19:00:04

I tend to disagree. The settings on those page are completely wrong. Do
as per instructions by Papyrus, and you should be fine.

-Gregor


> Go to this site and have a looksie about settings for your FF wheel
> and more. http://www.slottweak.com/ then Go down to Misc. and
> Comrtoller And Game Settings..
> I think you will find your Logitech FF GP wheel here? Gary D aka
> GTX_SlotCar has one great site... Hope this helps? Thom_j.

Thom j

GPL newbie - force feedback

by Thom j » Tue, 05 Jun 2001 03:27:14

Well they have been spot on for me and I feel his info is invaluable
at times but you have the right to your opinion as I do mine!! :o)

| I tend to disagree. The settings on those page are completely wrong. Do
| as per instructions by Papyrus, and you should be fine.
|
| -Gregor
|
|
| > Go to this site and have a looksie about settings for your FF wheel
| > and more. http://www.slottweak.com/ then Go down to Misc. and
| > Comrtoller And Game Settings..
| > I think you will find your Logitech FF GP wheel here? Gary D aka
| > GTX_SlotCar has one great site... Hope this helps? Thom_j.
| >
|

Paul Laidla

GPL newbie - force feedback

by Paul Laidla » Tue, 05 Jun 2001 12:21:42

They are complete and total nonsense!


> | I tend to disagree. The settings on those page are completely wrong. Do
> | as per instructions by Papyrus, and you should be fine.
> |
> | -Gregor
> |

> |
> | > Go to this site and have a looksie about settings for your FF wheel
> | > and more. http://www.slottweak.com/ then Go down to Misc. and
> | > Comrtoller And Game Settings..
> | > I think you will find your Logitech FF GP wheel here? Gary D aka
> | > GTX_SlotCar has one great site... Hope this helps? Thom_j.

    Paul
Thom j

GPL newbie - force feedback

by Thom j » Wed, 06 Jun 2001 02:55:11

As you say with your small minded extremely limited subjective opinion!!
Cheers!! <BFG>

| > Well they have been spot on for me and I feel his info is invaluable
| > at times but you have the right to your opinion as I do mine!! :o)
|
| They are complete and total nonsense!

Paul Laidla

GPL newbie - force feedback

by Paul Laidla » Wed, 06 Jun 2001 10:23:25

Hmmm, I guess I'd better explain how I think this all works then, but sadly
it is quite complex!

The max_steering_torque value works as described by papyrus, there is no
reason to
think it doesn't, after all they wrote the game! The Torque at the steering
wheel is computed
by the physics model (in Newton Inches according to the text in core.ini)
and this is divided
by max_steering_torque (and maybe clamped between -1.0 and 1.0)

If we set the damping to 0 and adjust max_steering_torque everything works
exactly as it should
as far as steering centering/weight is concerned (no impact forces yet),
increasing max_streering_torque
decreases the force we feel as it should, decreasing this value increases
the force we feel but if we set it
too low the feedback forces clip making it harder to differentiate changes
in steering feel.

This is basically the complete opposite of what is said on that website
which recommends huge numbers
for this setting which gives almost no steering centering/feel.

The force_feedback_damping value is what causes all the problems because it
is used for more than just damping!

GPL has 2 types of forces, the steering force computed by the physics model
and preprogrammed forces for
collisions/kerbs/rough ground etc.

The force_feedback_damping is used to damp spikes (noise) in the computed
steering torque by subtratcing
a percentage of the change from frame to frame, if we set
force_feedback_damping too high the damping value
will become bigger that the computed value which will result in bizzare
steering effects such as force feedback
trying to turn us INTO the corner when the exact opposite should happen and
this is exactly what happens with
the huge damping values from that website.

The force_feedback_damping value is also used to scale the collision forces
so you have to
use some damping if you want these forces. If you set the value too high the
collision forces become
massive (they will clip to the maximum feedback force) even for tiny little
knocks or driving on grass etc,
again this is exactly what happens with the values from that website.

Things would be better if a seperate coefficient was used to scale damping
and impact forces but I
guess papy thought this good enough, it just about is.

You should use a smaller force_feedback_damping value than
max_steering_torque value in order
to get nice centering/feel and a reasonable impact force level. The default
max_steering_torque as
used by papyrus should be a good starting point as they actually know what
values the physics model
computes, so you shouldn't stray too far from this value.

All in all the values suggested on that website are completely wrong, they
give bizzare steering effects
and massively excessive impact forces, I suspect my steering wheel would
soon break if I used those
values for long! It wouldn't do my wrists much good either!

Anyway if you still want to use those values then go right ahead,
as you say, you have the right to your own opinion.

BTW what does BFG stand for? Big ******* Grin ?



> | > Well they have been spot on for me and I feel his info is invaluable
> | > at times but you have the right to your opinion as I do mine!! :o)
> |
> | They are complete and total nonsense!

    Paul
J

GPL newbie - force feedback

by J » Wed, 06 Jun 2001 16:17:17

May I throw something in?

Beside the fact that FF settings are always following individual likings,
different wheels even from the same type are reacting different to a given
setting.
I tried it myself with several old LWFF (why are those thingies all over my
house ;-) and needed total different settings to suit my taste.

Hope this brings down the tension a bit.

JensSchumi

BTW: there was an excellent primer about those FF-settings awhile ago by
Ambulator (if I recall right).
Whoever wrote this fantastic guide, herewith I ask officially for permission to
publish it in the files section of the LWFF-forum :-)


>As you say with your small minded extremely limited subjective opinion!!
>Cheers!! <BFG>



>| > Well they have been spot on for me and I feel his info is invaluable
>| > at times but you have the right to your opinion as I do mine!! :o)
>|
>| They are complete and total nonsense!

--
LWFF Ball Bearing conversion at:
http://members.nbci.com/JensSchu/

GPLRank: -10.1
Monsters of GPL: sub 200

Gregor Vebl

GPL newbie - force feedback

by Gregor Vebl » Wed, 06 Jun 2001 16:53:06

Actually, I just checked the site again. The advice on this page is
sound:

http://www.slottweak.com/gplintro.htm

what is written here, though:

http://www.slottweak.com/gamesettings.htm

completely abuses the FF engine (it makes the steering feel like a bad
implementation of power steering found on many a roadcar). It all
depends on which settinng you are refering to.

-Gregor


> Well they have been spot on for me and I feel his info is invaluable
> at times but you have the right to your opinion as I do mine!! :o)

Thom j

GPL newbie - force feedback

by Thom j » Thu, 07 Jun 2001 01:33:56

Agreed 100% JS.. Everyone has different driving techniques and styles so
[in my eyes] for anyone to say "They are complete and total nonsense!" is
blatantly rude! I did say: "they have been spot on for me and I feel his
info
is invaluable at times" No more, No less! So after my friendly comment I
receive such a rude reply I just put them in my ignore bin!!
Thank you for trying to: "bring down the tension a bit" but there isnt any
tension on my end :-).. I just consider the reply & rather not deal with a
source with such a blanketed trite petty reply.. Cheers Thom_j.


| May I throw something in?
|
| Beside the fact that FF settings are always following individual likings,
| different wheels even from the same type are reacting different to a given
| setting.
| I tried it myself with several old LWFF (why are those thingies all over
my
| house ;-) and needed total different settings to suit my taste.
|
| Hope this brings down the tension a bit.
|
| JensSchumi
|
| BTW: there was an excellent primer about those FF-settings awhile ago by
| Ambulator (if I recall right).
| Whoever wrote this fantastic guide, herewith I ask officially for
permission to
| publish it in the files section of the LWFF-forum :-)
|
|
|

|
| >As you say with your small minded extremely limited subjective opinion!!
| >Cheers!! <BFG>
| >

| >| > Well they have been spot on for me and I feel his info is invaluable
| >| > at times but you have the right to your opinion as I do mine!! :o)
| >|
| >| They are complete and total nonsense!
| >
| >
|
| --
| LWFF Ball Bearing conversion at:
| http://members.nbci.com/JensSchu/
|
| GPLRank: -10.1
| Monsters of GPL: sub 200

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Thom j

GPL newbie - force feedback

by Thom j » Thu, 07 Jun 2001 01:50:28

Gregor, I didnt detail which setting or settings. I was only trying
to give a newbie a place to get an idea where to find good info!
As I just re-posted to JS... It was only a friendly comment to a
new GPLracer!
When somone tries to make me look like a fool with a narrow
minded blanketed reply I know they are just being a wise azz!
So I just put them in my ignore bin! I have just as much fun on
here teazing the next guy when its all in fun but not when I am
trying to help one & then another does not need to be rude &
make a quick sniped statement just to be a wise azz.. I'm too
old for this petty juvenile garbage & I'm certainly not stupid!!
Nuff said! :-) Cheers Thom_j.


| Actually, I just checked the site again. The advice on this page is
| sound:
|
| http://www.slottweak.com/gplintro.htm
|
| what is written here, though:
|
| http://www.slottweak.com/gamesettings.htm
|
| completely abuses the FF engine (it makes the steering feel like a bad
| implementation of power steering found on many a roadcar). It all
| depends on which settinng you are refering to.
|
| -Gregor
|
| >
| > Well they have been spot on for me and I feel his info is invaluable
| > at times but you have the right to your opinion as I do mine!! :o)
| >

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Paul Laidla

GPL newbie - force feedback

by Paul Laidla » Thu, 07 Jun 2001 05:48:33


    Sorry if you think I am rude but those settings are nonsense on any
wheel.



> | May I throw something in?
> |
> | Beside the fact that FF settings are always following individual
likings,
> | different wheels even from the same type are reacting different to a
given
> | setting.
> | I tried it myself with several old LWFF (why are those thingies all over
> my
> | house ;-) and needed total different settings to suit my taste.

This is true to an extent, but within limits.

I don't see any need to feel at all tense about this! After all
we are only talking about force feedback settings! Feel free
to use whatever settings you want if you don't agree with my opinion,
it's no big deal.

    Paul

Paul Laidla

GPL newbie - force feedback

by Paul Laidla » Thu, 07 Jun 2001 05:50:39

Yes, this is quite reasonable.

Which is the bit I looked at! As I said, complete and utter nonsense.

    Paul


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