Physics "bug" or the real thing?

[fasternfaster]

I can explain it to you all. It lies in the mathematical equations that are used to "describe" car physics. One of the best formulas to use for grip and an object with 4 contact points is called the "Pietzchke Formula."

This formula basically determines how much grip there should be. It works amazing at speed, the faster you go the more accurate! Now you're saying, wait usually as things increase the less predictable/accurate. With the Pietzchke Formula the inverse is true.

In the Pietzchke formula speed or velocity is in the denominator of the formula. Big Problem!! As the car's velocity slows, the velocity becomes closer and closer to ZERO. What happens when you divide by ZERO? Error, error! Undefined, impossible!

Sooooo, to get over that they (car game makers) use a second formula to simulate grip&contact for lower speeds. In older games you could actually feel where your car was being controlled by one formula and then switching over to the other. This is the case here!

It is extremely hard to simulate grip when v=0, hence the sliding problem. There you have it.

how about you post a link to an article? or site a reference? i cant find much on this guy or his "formula".

In either case its a bug.

 

[amfitamine]

Cleanme, googeling Pietzschke Formula doesn't give that much results.....
At higher speeds the physics engine seems/feels more accurate but that's hard to prove. There seems to be a too big sideway force being calculated for a given tire friction force or the friction force is not properly implemented when sideway forces are applied?

 

[matski]

This is a shortcoming in the physics engine.

In the event of a Black Flag in NASCAR (I thinks its black or red). They do sometimes stop the cars on track. It is eerie to see as they look as if they are hurtling round at 200mph, whereas actually they are at a dead stop, but still in formation!. This takes place for instance where it has started raining...

You don't see JG or Dale Jr, in a 4 wheel slide down to the apron when stationary, even in the wet!

There is alos some physics to support my claim, but I can't remember it.