Burnout Behavior.

[Aaddiction]

Hi, I'm just on my way trying the 4 wheeler ext, and I got to say it is a revolution. Bravo !

However, as a car enthusiast and (if I might say) not a bad 3d artist, one thing got my attention immediately - the burnout. I think it should be animated in other way.

When doing a burnout the car leans forward. I think thats wrong. While burning rubber even with brakes applied the carbody should slightly lean backwards, the rear should struggle for grip and some of the car weight will go to the rear.
With the 4 wheeler its the contrary... Correct me if I'm wrong.

Regards.

[Carl Buhre]

Hi, I'm just on my way trying the 4 wheeler ext, and I got to say it is a revolution. Bravo !

However, as a car enthusiast and (if I might say) not a bad 3d artist, one thing got my attention immediately - the burnout. I think it should be animated in other way.

When doing a burnout the car leans forward. I think thats wrong. While burning rubber even with brakes applied the carbody should slightly lean backwards, the rear should struggle for grip and some of the car weight will go to the rear.
With the 4 wheeler its the contrary... Correct me if I'm wrong.

Regards.

Hello Aaddiction and welcome to our forum. If you enter the configuration for Craft 4-Wheeler Extended and go down to a section called "General Parameters" you will find a setting for "Burnout Tilting Force". With this setting you can adjust how much the vehicle should tilt during a burnout. Set this value to "-1" to have the vehicle tilt backwards instead.

[Aaddiction]

Wow. Amazing.
Thanks and sorry !

[Carl Buhre]

Wow. Amazing.
Thanks and sorry !

Your questions are always welcome. If there is anything else you're wondering, please let us know. And any feedback we get only helps us make our products better.

[Aaddiction]

Well, may be again there is more to explore, but there is something I would like to ask again:

The hipoly model is linked to the dummy and everything is ready. When I press record however, at the second frame the dummy gets scaled in the y axis and the hipoly model with it, so everything squeezes, except the wheels (they got covered by the body) and this is how the animation continues - with auto scaled body model and dummy. This happens when I'm scaling the dummy to adjust it to the model's proportions in the pre-linking phase. It might be some auto adjust mode of the dummy's proportions. I don't know really...
Thanks.

[Luigi Tramontana]

Hello Aaddiction.

This tilt force issue is interesting and I will try to answer it as correctly as I can.
The leaning backward occurs during acceleration of the car (although this all depends on the suspension system, but in the ordinary car case). When you have a backward drive car you hit the brake and the main brake force will be on the front wheels, while the back wheels are pushing the car forward. It is kind of like braking, then you also get a force on the bottom of the front wheel which in turn creates a torque on the chassis in the forward direction yielding a forward leaning of the car.
However, if you have a forward drive car and pull the hand brake you would have the opposite action leaning the car backwards.

At 0:30 you will see the lifting of the back part: http://www.youtube.com/watch?v=LI5Fx9ymaUc&feature

In this clip you will see the backward leaning when she lets go of the brakes due to the acceleration. Sports cars have very hard suspension and therefore they do not lean very much during the burnout, especially when the rubber becomes soft and oily since then the friction becomes comparably low and therefore the leaning forces.
http://youtube.com/watch?v=C7XUOZDh__s&feature

Best,
Luigi TA

[Aaddiction]

Thanks. You're quite right. May be I've been led in a wrong direction, because of an impression of a FWD car or/and regarding that the car is not fully static in my observations.

[Aaddiction]

Hi again. Take a look here if you can. It sure leans backwards and it's a nice RWD BMW.

http://youtube.com/watch?v=k9l8QPPC3VU

[Luigi Tramontana]

Beautiful (:
Yes, that is obviously another behavior. It all depends on how the suspension is set up. My guess is that such street race cars have lowered the front and back suspension in such a way that the resultant force on the back suspension during a burnout apparently pushes it downwards. Good one, thanks for the research *-)

// Luigi TA

[benji]

hi can i burn out the front wheel?
coz my car is FWD

[Carl Buhre]

hi can i burn out the front wheel?
coz my car is FWD

Hi Benji,

I'm afraid not. You can change the steering of that vehicle to behave like a fork-lift, 4-wheeled lawnmover, etc. though. This would be a nice features so who knows, it might show up in the future... Hehe.