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Force feedback update for GPL


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#1 brr

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Posted Apr 25 2009 - 06:12 AM

Here is a patch which reduces ffb latency and removes all (I think) non-physics forces. Those ffb users who prefer to feel only the forces from the physics engine without any damping, centering, or similar forces should find this useful.


READ THE README CAREFULLY AND
FOLLOW THE INSTRUCTIONS

USE AT YOUR OWN RISK


Since there are lots of different wheels, I cannot guarantee that this patch will work flawlessly for everyone. Use a low ffb strength initially, and gradually increase it as necessary. No damping means that strong force spikes go to the wheel unmodified.

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  • Attached File  ffb2.zip   1.7K   1900 downloads


#2 dangermouse

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Posted Apr 25 2009 - 07:24 AM

Many thanks Petteri.  :thumbup:
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#3 Rodolfo

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Posted Apr 25 2009 - 09:51 AM

Thank you, I will try it
Rolf

#4 Claudio Pablo Navonne

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Posted Apr 25 2009 - 03:20 PM

Thanks!!
I´ll report it.
Claudio

#5 fgubbels

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Posted Apr 26 2009 - 09:12 AM

Thanks Petteri. I had a trial and it looks not bad at all. I need more time to complete my impressions on that.

Great editing stuff anyway

#6 Bob Simpson

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Posted Apr 27 2009 - 10:31 AM

This seems to work well.  Thanks.

#7 JohnnyAck

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Posted Apr 27 2009 - 11:29 PM

View Postbrr, on Apr 25 2009, 07:12 AM, said:

Here is a patch which reduces ffb latency and removes all (I think) non-physics forces. Those ffb users who prefer to feel only the forces from the physics engine without any damping, centering, or similar forces should find this useful.


READ THE README CAREFULLY AND
FOLLOW THE INSTRUCTIONS

USE AT YOUR OWN RISK


Since there are lots of different wheels, I cannot guarantee that this patch will work flawlessly for everyone. Use a low ffb strength initially, and gradually increase it as necessary. No damping means that strong force spikes go to the wheel unmodified.
Hey, nice. Thanks. I will give it a go, though I got my damping adjusted to where I got the extra effect stuff like hitting the armco, working pretty fun-like. If anyone likes to feel the bumps I use 8 on the damping slider for g25, and set core at 20 in the damping.

#8 brr

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Posted Apr 28 2009 - 12:35 AM

View PostJohnnyAck, on Apr 28 2009, 08:29 AM, said:

Hey, nice. Thanks. I will give it a go, though I got my damping adjusted to where I got the extra effect stuff like hitting the armco, working pretty fun-like. If anyone likes to feel the bumps I use 8 on the damping slider for g25, and set core at 20 in the damping.

The ffb update does allow nonzero damping values in Core.ini, but everyone using such values should be very careful. The way damping works, as far as I understand it, is by adding a small value to the force which is opposite to the rate of change. So if the force is increasing, damping adds a negative term and vice versa. This becomes unstable when there are rapid changes, like hitting the armco. I tracked the ffb values briefly and found that they shoot through the roof (five-figure torque values) when hitting an armco if damping is used. My ffb patch removes other kind of damping, which amplifies the effect. So to be safe, start with quite small values and increase gradually. The damping effects are nice, but they are likely to be oscillations of the damping equations. The damping correction overshoots, and then overshoots back in the other direction etc..

#9 brr

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Posted Apr 28 2009 - 01:15 AM

"brr" said:

(five-figure torque values)

Lets make that four-figure values after actually logging the values to a file  :rolleyes:

#10 Bob Simpson

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Posted Apr 28 2009 - 06:16 AM

I found that with this patch I feel the armco effects with the damping value at zero.

At Overall force = 100% in the game controllers window and 400 in core.ini for torque, the forces were too low for my G25.  Torque seems to be good around 300, where I used to use about 250.

#11 Masher

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Posted Apr 28 2009 - 07:58 AM

Tried this patch but don't get anything to tick in gem what am I doing wrong followed the instuctions carefully :huh:

#12 brr

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Posted Apr 28 2009 - 08:30 AM

View PostMasher, on Apr 28 2009, 04:58 PM, said:

Tried this patch but don't get anything to tick in gem what am I doing wrong followed the instuctions carefully :huh:

Which version of GEM+? Double check the folder where you put ffb2.xml, the default path in the README does not work if GEM+ is installed elsewhere.

#13 Bob Simpson

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Posted Apr 28 2009 - 08:32 AM

From the readme:

Quote

Put the ffb2.xml file into your GEM+ Options folder (by default at c:\Program Files\GPLSecrets\GEM+\Options) and check the "ffb2" tickbox in GEM+.
If you put the ffb2.xml in the place noted, you'll see a box to check in the bottom right area of GEM.

#14 Masher

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Posted Apr 28 2009 - 04:58 PM

It all works now for some reason I have gem secrets in two places c/ and c/programs I first put the ffb2 in c/programs but latter put in c/ go figgure thanks for your help and thanks guys for all the marvolus enhancments this game has had from you guys cya
Paul from Australia :D

#15 SteveC43

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Posted Apr 29 2009 - 06:07 AM

I'll give this a go after finals next week. Thanks brr!




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