Grooveeffects

MileSeven

MileSeven

Registered
I’m already in a rabbit hole and I know that many tyre parameters are simply too complicated to worry much about, but GrooveEffects…

Simple question that I’ve yet to find a reference to: Is this variable intended to distinguish between slick and treaded tyres or not? I’m not looking for a detailed explanation (unless an existing one can be referenced easily) as it’s not my primary focus just now but….

Thanks.
 
Yes, the "Comment" for that Setting, in the Skip Barber tgm File is:

maximum groove influences grip here for: static friction, sliding adhesion, sliding micro-deformation, sliding macro-deformation
 
I must say using google AI to explain some of the tgm values helps alot, also getting ideas to what to change. It's not always right but does give good hints. and it explains it in your own language
 
I seem to recall GrooveEffects sets grip change when driving on rubbered path.
It's not exactly about slicks or treaded tyres, which probably you should differentiate by means of DampnessEffects and other parameters.
 
The GrooveEffects parameter in the rFactor 2 .TGM file determines the extent to which the rubber deposited on the track (the "rubbered-in groove") increases tire grip. It does not generate grip on its own; rather, it acts as a multiplier applied to the various components of the friction model when the car drives along a rubbered-in racing line.
Studio-397 +1
The syntax is:
GrooveEffects=(Static, Adhesion, Micro, Macro)
The 4 values correspond to:
Static: increase in static friction (grip before sliding).
Adhesion: increase in sliding adhesion (molecular adhesion).
Micro: influence on rubber micro-deformation.
Macro: influence on macro-deformation (interaction with track texture).

Example :
GrooveEffects=(0.025, 0.025, 0.020, 0.020)
This means that with a fully rubbered-in track:
Static friction: +2.5%
Adhesion: +2.5%
Micro-deformation: +2.0%
Macro-deformation: +2.0%
These represent the maximum effects when the racing line is completely covered in rubber. On a partially rubbered-in track, the effect is interpolated.

In-game influence
Low values (0 to 0.02): the track changes little; grip remains constant.
Medium values (0.02 to 0.05): realistic progression; the racing line gradually becomes faster.
High values (>0.08): the difference between a clean track and a rubbered-in track becomes very significant; lap times depend heavily on the amount of rubber deposited.
Lammasandska +1
Note that there is also:
GrooveSqrdEffects=(...)
which adds a non-linear (quadratic) effect. It allows you to ensure that initial rubber deposits have little effect, with grip increasing significantly once the racing line is heavily rubbered-in—or vice versa, depending on the values used.
Lammasandska
 
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I think it is logical that slick tires vs treaded tires, and soft compounds vs hard compounds should experience different magnitude of groove effects and probably should be differently arranged as well. Slick tires, especially soft compound probably should be impacted the most. Hard compound treaded tires the least.

My reference is logic - slick tires will have more contact with surface, thus increased or decreased friction of the surface should have more impact on the performance. Same goes for micro and macro deformations, more tire in contact will "collect" more bite points into irregularities of tarmac surface. Technically tire tread with its many edges also should have some kind of enhancing effect on biting to surface, but I guess it depends on compound, tread pattern and tread depth, one thing certain is that treaded tire will have less molecular bonding when it is dry.

By the way, in dampness effects line I find that macro deformations effect is most important to get right.

I wish rubbered line roughness parameters of the surface were correctly processed by physics engine when it gets wet, rF2 would automatically have dynamic wet racing lines. They kept that for LMU, didn't they ?

One of other "simple" parameters is RubberPressureSensitivityPower, altering first and second, especially the second value can result in dramatic changes in grip.
 
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