What is the typical scale factor for Clift? In other words, how far off
> is the simulation from reality?
It depends on the car. For example the real XJ220 is said to generate
downforce equal with its weight on Wikipedia, though the exact speed is not
mentioned. Guessing it reaches 15000 N at 300 kph gives a clift of 0.54,
which is not that far from the 0.63 used.
On the other hand the 360 Challenge Stradale has 2600 N at 300 kph (also
from Wikipedia), which gives a Clift slightly under 0.1 - so in this case
it is way overestimated.
For the LS-GT1 it was calculated from data, for 36GP and MP5 was estimated
from values get from a "numeric windtunnel", so these should be close to
Two thing to note about Clift:
- it is meant as Clift on one of the front or rear tires, so the total
Clift is 2*front Clift + 2* rear Clift;
- the actual downforce depends on the average ride height, it is 2/3 of the
maximum at 10 cm, reaches 99% around 4 cm.
> But part of the problem is the SD simulation has not advanced much since
> the fork. During the same period, I believe the VDrift physics engine
> was completely rewritten and, to my untrained eye, seems much more
> advanced than simuv4 right now.
Within 2-3 years we will also have a new simulation engine and a new
graphics engine. The slow advance was chosen to keep our existing robots
and cars working, so new features are now optional and we keep
compatibility unless an ugly bug needs to be fixed.
So yes, you are right seeing this problem, but we need time to solve it.
> I am not qualified to judge whether their simulation is better or even
> realistic, but I can say that their cars are definitely more difficult
> to drive than in SD. A Toyota Levin was the best I could manage without
> driving aids!
Warning: difficult to drive is net equal realistic. Not all real cars are
difficult to drive, some of them are nice, some are really hard to control.
As for Vdrift, I have last tried it a few years ago, only for a short time.
>From those memories, I think its cars are difficult to drive because they
are tuned for drifting and oversteer, which require special skills. And
somewhat different skills then driving around a track as quick as possible.
But I do not know their code, so yes, it might be more advanced than our.
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