Xtreme Gaming Network
Simulation Racing Leagues => Assetto Corsa => Topic started by: Rolz on April 09, 2016, 10:08:59 AM
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Thought I'd put this in a separate post so people see it.
Firstly thanks Marty for pointing it out.
What is this?
This is a tool that produces an FFB lookup table for AC. It is used to (hopefully) correct the non-linear behaviour of the motors located on our steering wheels.
http://www.assettocorsa.net/forum/index.php?threads/lut-generator-for-ac.31699/
Been given a pretty decent rap by some AC mod contributors...
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It will be interesting to try. One thing I read somewhere is that some wheels are non-linear by design, e.g. to produce a stronger force output at lower rotation to compensate for something or other (as you can see, details in my head are sketchy). But the proof will be to try it and see what it feels like.
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Since I ran this it has made a fairly big change to my g27, clearly shows much more linear FFB as I now get more feedback all through the range even with total force higher then I had before. There is a bit more road feel but mostly its a better progression of grip gain and loss which in turn gives much better feel closer to the limit.
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Thought I'd put this in a separate post so people see it.
Firstly thanks Marty for pointing it out.
What is this?
This is a tool that produces an FFB lookup table for AC. It is used to (hopefully) correct the non-linear behaviour of the motors located on our steering wheels.
http://www.assettocorsa.net/forum/index.php?threads/lut-generator-for-ac.31699/
Been given a pretty decent rap by some AC mod contributors...
Didn't you buy a CSW V2? I thought it was supposed to be quite linear (bar maybe a 5% minimal force needed).
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That's what I've been reading, but no harm in seeing what it does :)
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This is my T500 at 50% overall strength (blue), and the LUT that is generated (red). As you can see, it's already pretty linear, but with the LUT I feel more straight line road bumps. It felt a little too "noisy", so I reduced the first 3 LUT values by 0.25x, 0.5x and 0.75x, and it smoothed the very bumpy road feel a bit.
(http://i1329.photobucket.com/albums/w549/WallyMasterson/RawLUT_zpsgkc5whlp.png)
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Is it easy to use and then abandon if need be?
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Is it easy to use and then abandon if need be?
Yeah, I guess so. It's just a one file you have to change + a new controllers profile. So you can have a safe copy of the old one and replace and then run the old profile.
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basically the ini file you modify for it just do a copy and revert back if you want. :)
Wally how do you do that graph?
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This is my Wheelcheck outcome and LUT. It is for a Fanatec GT2 (which seems surprisingly linear after the dead-zone). I am surprised by the fact that I was running the hardware at 90%FF, which I thought it meant capped at 90% in fanatec wheels, but the wheelcheck shows no difference.
I have made a 0 dead-zone profile in AC now and testing. Seems ok, though not much of a difference (as expected from graph) but the wheel got a bit warm, something it did not do before.
Link to picture: https://www.dropbox.com/s/gujezanexlbcacs/LUT.png?dl=0 (https://www.dropbox.com/s/gujezanexlbcacs/LUT.png?dl=0)
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basically the ini file you modify for it just do a copy and revert back if you want. :)
Wally how do you do that graph?
Rolz, open the log and the LUT on excel. You have to normalize DeltaXDeg, i.e. DeltaXDeg/max(DeltaXDeg) to get it scaled 0 to 1. Then basically you graph DeltaXDeg and LUT (possibly putting "force" as the X axis labels as I did.
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Where do you change those values Wally?
My T500 feels the same as yours but more so under brakes. Get a real chattering thru the wheel as you brake hard. Not sure which file your referring to.
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Where do you change those values Wally?
My T500 feels the same as yours but more so under brakes. Get a real chattering thru the wheel as you brake hard. Not sure which file your referring to.
He is talking about the LUT file generated with the procedure described in the link in Rolz's first post.
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Is this the .csv or the .lut file?
If I open the csv with excell I see nothing or if its the lut file what do I open that with?
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Is this the .csv or the .lut file?
If I open the csv with excell I see nothing or if its the lut file what do I open that with?
The line representing your wheel's behaviour is the last column of the csv file, but normalized to get values between 0 and 1. The line representing the LUT is the last column of the lut fille---you can open it with excel and tell excel that the columns are delimited by the symbol | .
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Is this the .csv or the .lut file?
If I open the csv with excell I see nothing or if its the lut file what do I open that with?
Both files are just text files, that you can open with Notepad or any other text editor you might have. I plotted the graphs in Google Sheets (spread sheet). I opened the WheelCheck CSV, copied all the text, and pasted it into a new Google Sheets document. Click on the little icon that appears at the bottom of your selected data and choose 'Split text into columns'. Then you can select all of the numbers in the deltaXDeg column, and click the Insert Chart button on the toolbar. It will suggest a graph layout like my blue line, which is all you have to do if you want to check the basic shape of your wheel's graph.
If you got that far, I can tell you how to add the LUT line as well, although that's not really so interesting. It's just the mirror image around the diagonal of your wheel check graph.
The values I reduced where in my generated LUT file, in documents Assetto Corsa\cfg, which I had called Wally.lut. I reduced the first 3 bolded values:
0|0
0.02|0.050
0.04|0.115
0.06|0.185
0.08|0.258
0.1|0.276
This reduces the sudden "attack" in the generated post-processing, where minimal FFB signals are suddenly boosted very high.
PS. One thing I had to do with my T500 before running WheelCheck was put the Constant force setting in the TM profile to 100, to get a decent range of wheel rotation. Afterwards, I put it back to the previous value of 30.
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Could someone post their original " ff_post_process.ini " file please.
Cant seem to get the feel I like and forgot to save the original.
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Could someone post their original " ff_post_process.ini " file please.
Cant seem to get the feel I like and forgot to save the original.
If you want to turn it all off, just set ENABLED=0. I haven't found the LUT useful for the T500, to be honest. The wheel is already quite linear.