Rear-wheel steering - is it possible with physX simulation?

[eggbeast 3673]

Rear-wheel steering - is it possible with physX simulation?

 

We have an A1 Skyraider with the rear wheel as the steering wheel.

This worked fine in Arma 2, and Arma 3 until we made it use the new wheel physX

Now ithe plane fights you when you try to turn.

If you make the wheel turn the right way, (looking down on it, nose forward), then

the wheel should turn anti-clockwise to steer right.

If this was a front nose-wheel, the wheel should turn clockwise to steer right

Now that wheels are properly simulated, we are finding that either

a) the wheel correctly turns anti-clockwise to steer right, but the plane is "told" to steer the other way, or

b) the wheel turns clockwise (like a correct nose-wheel), and the wheel physx causes drag in the opposite direction

 

i'm really stumped with this - anyone out there worked on a rear-wheel steering vehicle yet?

 

[eggbeast 3673]

cracked it with a rough workaround

I configured the rear wheel as though it was a nosewheel, so it turns the "wrong way" for a rear wheel, and then

added

        wheelSteeringSensitivity = 2;

and increased the wheel physical range of rotation to 90 degrees (45 each way)

the plane still struggles at very low speed

but at moderate speed you can rotate freely - i guess the speed overcomes the drag of the wheel facing the wrong way

 

 

[NightIntruder 710]

Egg, you may tinker with those values below to overcome the physx that's banking the plane in wrong driection, I guess. Not tested tho.

antiRollbarForceCoef	= 0;
antiRollbarForceLimit	= 5; 		
antiRollbarSpeedMin 	= 20; 		
antiRollbarSpeedMax	= 60; 

 

[martinezfg11 334]

Is your wheelcenter memorypoint on the center of your model?

 

I had this issue where on a rear steering aircraft, it would "crab walk" when turning at slow speeds, I had to offset the wheel center off to the side, and now it works better at low speeds.

[eggbeast 3673]

ah ok worth a try thanks

 

[DSabre 2325]

Hi Egg,

did you have any success there?

 

***Edit: meanwhile I have set up simple examples for tricycle and tail drag https://forums.bohemia.net/forums/topic/212947-airplanex-physx-challenge/ ***

 

[eggbeast 3673]

not had a chance to work on this lil problem yet

[TeTeT 1520]

I just did a quick test with moving the rear wheel center and rim memory point 10 cm to the side of the wheel's side definition on the A-1. Results are definitely better!