rec.autos.simulators

GPL and Force Feedback

BRH

GPL and Force Feedback

by BRH » Thu, 27 Jan 2000 04:00:00

I'm hoping to pick up a LWFF wheel unit in the next few days, and need
to know how to activate Force Feedback in GPL 1.2.

From what I recall reading awhile back, I think that one of the ini
files need to be edited.

Can anyone help with this?

Thanks.

Kurt Steinboc

GPL and Force Feedback

by Kurt Steinboc » Thu, 27 Jan 2000 04:00:00

Hey, BRH --

When I replied to your question this morning, I said that your answer was
int he read-me for 1.2.  I was wrong -- it was in the read-me for 1.1, when
ff was introduced.  I apologize, and to make up, here is the info you
need...

(See below)

Kurt

BTW, have fun!

9. FORCE FEEDBACK SUPPORT
----------------------------

It is possible to enable force-feedback steering by adding the following
lines to core.ini:

[ Joy ]
allow_force_feedback = 1    ;

Additionally, there are (of course) some things to fiddle around with.
Three other lines can be added--these are the default values used if these
lines are missing:

force_feedback_latency = 0.085               ; in seconds
force_feedback_damping = 40.0                ; magic number

force_feedback_latency can be used to try to reduce the lag in force
buildup.  If you swerve back and forth at speed, you might notice that the
force does not seem to match what the car is doing--it is a little out of
phase.  The default value seems to work best with the Microsoft wheel, other
wheels may require some tweaking.  Generally, the lowest number that works
for you is probably best.  Try 0.0, then move it up if the force seems out
of phase.  If you set it too high, you will begin to get unwanted spikes in
the force levels.

force_feedback_damping can be used to counteract the unwanted spikes.
Guidelines for this number?  Try anything from 0.0 to several hundred,
maybe, but this also causes jumpiness if raised to excess.

max_steering_torque is the level of torque actually computed in the game
that will give the maximum force level on the device.  Setting this to a
higher number will reduce the force you feel.  Setting this lower will
increase the forces you feel, but will tend to clamp them, so you will not
feel the car loading up on a hill, etc.  Sorry about the bogus units
(although they are at least a unit of torque).


>I'm hoping to pick up a LWFF wheel unit in the next few days, and need
>to know how to activate Force Feedback in GPL 1.2.

>From what I recall reading awhile back, I think that one of the ini
>files need to be edited.

>Can anyone help with this?

>Thanks.


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