Bicycle Script

I'm attempting to modify the StarTrooper player control script to work with a bicycle game. I've managed to strip out most of the things I didn't need and have had good success with the steering. I have run into 2 problems though.

1. I get a lot of shake/bumps over the land object. I'm using a mesh object with a mesh collider and a capsule collider on the bike.

2. When I go down hills, I get a large amount of acceleration which results in an uncontrollable bicycle.

Suggestions appreciated.

Code (csharp):

1. #pragma strict
2.  
3. var turnSpeed : float = 3.0;
4. var sensitivity : float = .9;
5. var forwardForce : float = 50.0;
6.  
7. private var euler : Vector3 = Vector3.zero;
8.  
9. function FixedUpdate () {
10.     rigidbody.AddRelativeForce(0, 0, forwardForce);
11.    
12.     // Rotate turn based on acceleration       
13.     euler.y += -Input.acceleration.y * turnSpeed;
14.    
15.     euler.x = 0.0;
16.     euler.z = 0.0;
17.    
18.     // Apply rotation and apply some smoothing
19.     var rot : Quaternion = Quaternion.Euler(euler);
20.     transform.rotation = Quaternion.Lerp (transform.rotation, rot, sensitivity);
21. }
22.  

Motion constrain script using only Y motion constrained.

Code (csharp):

1. #pragma strict
2.  
3. var xMotion : boolean = true;
4. var yMotion : boolean = true;
5. var zMotion : boolean = true;
6.  
7. @script AddComponentMenu("Physics/Constrain Motion")
8. function FixedUpdate () {
9.     var relativeSpeed : Vector3 = transform.InverseTransformDirection (rigidbody.velocity);
10.    
11.     if (!xMotion)
12.         relativeSpeed.x = 0;
13.     if (!yMotion)
14.         relativeSpeed.y = 0;
15.     if (!zMotion)
16.         relativeSpeed.z = 0;
17.        
18.     rigidbody.AddRelativeForce (-relativeSpeed, ForceMode.VelocityChange);
19. }

 

If you are using a bicycle would it not be better to use to wheel shapes