Why the gravity value was set to be -20?

[dytiantian]

Like the picture of ‘Driving Demo' I enclosed to you, the gravity value was set to be -20.But usually this value is set to be -9.8m/s2. Would you mind telling us the reason why you set it to be -20?

[silent]

Hi,

 

We don't use real-world physics parameters in City Traffic system for speedup the physics calculations and simplifying the car setup process. So, the real mass of the cars, used in this demo is about 4 Kg and we set gravity to -20 to get more "realistic" behavior. We highly recommend to not setup real world cars parameters, since it would be really hard to tune them with current physics engine. It is better to use exsting cars as a example.

 

Thanks!