Trying To Make Kart Based sunspension

Hi i am trying to make suspension like box shoud hower, now my isue is duno what probably bad formula for counter force or meybe beacuse i am not using FixedUpdate(it gives wierd lags) cuz i alwes get crazy result

Spoiler: WhatIWantToMake

Spoiler: TheCode

Code (csharp):

1.  
2.  
3. using UnityEngine;
4. using System.Collections;
5.  
6. public class ReycastingSuspension : MonoBehaviour {
7.     //The distance of ray
8.     public float RaycastDistance;
9.     //Variable to play whit in unity editor
10.     public float SunspensionPower;
11.  
12.     // Use this for initialization
13.     void Start () {
14.     }
15.  
16.     // Update is called once per frame
17.     void Update ()
18.     {
19.                 //Difines botom corners so thet can later be used for raycasting
20.                 Vector3 pointA = transform.TransformPoint (new Vector3 (0.5f, -0.5f, 0.5f));
21.                 Vector3 pointB = transform.TransformPoint (new Vector3 (0.5f, -0.5f, -0.5f));
22.                 Vector3 pointC = transform.TransformPoint (new Vector3 (-0.5f, -0.5f, 0.5f));
23.                 Vector3 pointD = transform.TransformPoint (new Vector3 (-0.5f, -0.5f, -0.5f));
24.        
25.                 //defines HitColector and executes ray for PointA
26.                 RaycastHit hitColectorPointA;
27.                 if (Physics.Raycast (pointA, -transform.up, out hitColectorPointA, RaycastDistance)) {
28.  
29.                         //CRatio shoud be formula for how much ray is compresed
30.                         float CRatio =  hitColectorPointA.distance / RaycastDistance;
31.  
32.                         //Add UP force at point to lift thet side if its lower by any other force
33.                         rigidbody.AddForceAtPosition (Vector3.up * CRatio * SunspensionPower, pointA, ForceMode.Force);
34.  
35.                         // GreenRay if hiting somthing
36.                         Debug.DrawRay (pointA, -transform.up * RaycastDistance, Color.green);
37.                         Debug.Log (hitColectorPointA.distance);
38.                 } else
39.                 {
40.                         //Red Ray if not hiting anything
41.                         Debug.DrawRay (pointA, -transform.up * RaycastDistance, Color.red);
42.                 }
43.  
44.  
45.                 //defines HitColector and executes ray for PointB
46.                 RaycastHit hitColectorPointB;
47.                 if (Physics.Raycast (pointB, -transform.up, out hitColectorPointB, RaycastDistance)) {
48.  
49.                         //CRatio shoud be formula for how much ray is compresed
50.                         float CRatio =  hitColectorPointB.distance / RaycastDistance;
51.  
52.                         //Add UP force at point to lift thet side if its lower by any other force
53.                         rigidbody.AddForceAtPosition (Vector3.up * CRatio * SunspensionPower, pointB, ForceMode.Force);
54.  
55.                         // GreenRay if hiting somthing
56.                         Debug.DrawRay (pointB, -transform.up * RaycastDistance, Color.green);
57.                         Debug.Log (hitColectorPointB.distance);
58.                 } else
59.                 {
60.                         //Red Ray if not hiting anything
61.                         Debug.DrawRay (pointB, -transform.up * RaycastDistance, Color.red);
62.    
63.                 }
64.  
65.  
66.  
67.                 //defines HitColector and executes ray for PointC
68.                 RaycastHit hitColectorPointC;
69.                 if (Physics.Raycast (pointC, -transform.up, out hitColectorPointC, RaycastDistance)) {
70.  
71.                         //CRatio shoud be formula for how much ray is compresed
72.                         float CRatio =  hitColectorPointC.distance / RaycastDistance;
73.  
74.                         //Add UP force at point to lift thet side if its lower by any other force
75.                         rigidbody.AddForceAtPosition (Vector3.up * CRatio * SunspensionPower, pointC, ForceMode.Force);
76.  
77.                         // GreenRay if hiting somthing
78.                         Debug.DrawRay (pointC, -transform.up * RaycastDistance, Color.green);
79.                         Debug.Log (hitColectorPointC.distance);
80.                 } else
81.                 {
82.                         //Red Ray if not hiting anything
83.                         Debug.DrawRay (pointC, -transform.up * RaycastDistance, Color.red);
84.                 }
85.  
86.  
87.  
88.                 //defines HitColector and executes ray for PointD
89.                 RaycastHit hitColectorPointD;
90.                 if (Physics.Raycast (pointD, -transform.up, out hitColectorPointD, RaycastDistance)) {
91.  
92.                         //CRatio shoud be formula for how much ray is compresed
93.                         float CRatio = hitColectorPointD.distance / RaycastDistance;
94.  
95.                         //Add UP force at point to lift thet side if its lower by any other force
96.                         rigidbody.AddForceAtPosition (Vector3.up * CRatio * SunspensionPower, pointD, ForceMode.Force);
97.  
98.                         // GreenRay if hiting somthing
99.                         Debug.DrawRay (pointD, -transform.up * RaycastDistance, Color.green);
100.                         Debug.Log (hitColectorPointD.distance);
101.                 } else
102.                 {
103.                         //Red Ray if not hiting anything
104.                         Debug.DrawRay (pointD, -transform.up * RaycastDistance, Color.red);
105.                 }
106.     }
107. }
108. //Debug.LogWarning("WORKING");
109.  

 

How to appy FixedUpdate to my code but i need to smooth it whit deltaTime i dont get thet part

 

Physics should always be called from "FixedUpdate":
http://unity3d.com/learn/tutorials/modules/beginner/scripting/update-and-fixedupdate

It's also worth looking at Physics in general:
http://unity3d.com/learn/tutorials/modules/beginner/physics

There are at least two approaches you can take to this:
- One is to use forces, and you can look at the distance between the corner and the ground and the smaller the distance, the stronger the force.
- Another is to use wheel colliders, but don't use any wheels. The colliders will be invisible, so you can make extra-soft wheel colliders and roll on them.

One bit of advice when coding: If you ever repeat the same type of code more than once, you are doing something wrong.

This code is inefficient:

Code (CSharp):

1.     public int a;
2.     public int b;
3.     public int c;
4.     public int d;
5.  
6.     // Update is called once per frame
7.     void Update () {
8.         if (a > 0) {
9.             float someValue = a * myCurrentValue;
10.             float myRatio = someValue / someOtherValue;
11.             myRigidbody.AddForce (myRatio * mySpeed);
12.         };
13.      
14.         if (b > 0) {
15.             float someValue = a * myCurrentValue;
16.             float myRatio = someValue / someOtherValue;
17.             myRigidbody.AddForce (myRatio * mySpeed);
18.         };
19.      
20.         if (c > 0) {
21.             float someValue = a * myCurrentValue;
22.             float myRatio = someValue / someOtherValue;
23.             myRigidbody.AddForce (myRatio * mySpeed);
24.         };
25.  
26.         if (d > 0) {
27.             float someValue = a * myCurrentValue;
28.             float myRatio = someValue / someOtherValue;
29.             myRigidbody.AddForce (myRatio * mySpeed);
30.         };
31.     }

The first way to simplify things is to split our repetitive code into its own function:

Code (CSharp):

1.     public int a;
2.     public int b;
3.     public int c;
4.     public int d;
5.  
6.     // Update is called once per frame
7.     void Update () {
8.         if (a > 0) {
9.             DoSomething (a)
10.         };
11.      
12.         if (b > 0) {
13.             DoSomething (b)
14.         };
15.      
16.         if (c > 0) {
17.             DoSomething (c)
18.         };
19.  
20.         if (d > 0) {
21.             DoSomething (d)
22.         };
23.     }
24.  
25.     void DoSomething (int myInt) {
26.         float someValue = myInt * myCurrentValue;
27.         float myRatio = someValue / someOtherValue;
28.         myRigidbody.AddForce (myRatio * mySpeed);
29.     }

The next thing to try is to simplifying the script by putting the values in a collection and the code in a loop:

Code (CSharp):

1.     public int[] myIntValues;
2.  
3.     // Update is called once per frame
4.     void Update () {
5.         foreach (int myValue in myIntValues) {
6.             DoSomething (myValue);
7.         }
8.     }
9.  
10.     void DoSomething (int myInt) {
11.         float someValue = myInt * myCurrentValue;
12.         float myRatio = someValue / someOtherValue;
13.         myRigidbody.AddForce (myRatio * mySpeed);
14.     }
15.  

 

how would the vehicle smoothly stay at it's height? when I try this it bounces more like a a hovercraft rather than that video.

 

i am trying to figure thet out too

 

I know thet code was inefficient i just dident want to bother whit polishing it out before i figure out whats the issue i am trying to do first apprach but something is wrong whit my code dont know what i wated to get help about thet

 

please post your progress if you figure it out thanks

 

Well, I've not looked closely at the code, but in general - a hovercar should float or bounce a bit, as it's not on wheels. So, forces can give that floaty feeling. If it's to floaty, try using wheel colliders instead, but keep them invisible. In this latter case, the problem will be making the wheels "soft" enough.

Also, don't forget to look at mass and drag of the object's rigidbody.

 

did you watch

it is totaly stable

 

Oh. I read forces. And hover car.

For wheels, simply use a wheel collider. Look at the sample assets on the asset store and look at the car example.

 

whats point of using wheels coliders i will not learn anything i want to solve this problem

 

Then I'm totally confused...

If you want a vehicle to stick to the ground without bouncing, use a wheel collider. That's what they are designed for.

If you want a hover car that is suspended above the ground, use physics forces.

If you don't want to use either, use a frictionless material and just push the object around...

Your original post was:

What do you want to do??

 

like i sead i am trying to make suspenison like on video from 2 to 3 minut, i dont want to use weele coliders

 

Well, I don't really know what more to say...

That video tells you everything you need to know about how to make those vehicles work.

It explains, in detail, how to set up your raycasts and forces, and how the physics is supposed to work for all of the major behaviours.

If you have not looked at the "learn" site, then you should:
http://unity3d.com/learn

And look specifically at the items discussed in the video:
http://unity3d.com/learn/tutorials/modules/beginner/physics

^That section includes Rigidbodies (which allow physics on a GameObject), AddForce to move forward and up, AddTorque to turn, Raycasting to check the ground, and then Colliders and OnCollisionEnter for when you bump your vehicle into something.

You may also want to check the manual:
http://docs.unity3d.com/Manual/

... and look up each of these items (Rigidbodies, Colliders, etc.) ...

... and the Scripting Reference:
http://docs.unity3d.com/ScriptReference/index.html

... for the code required (Physics.Raycast, OnCollisionEnter, etc.)...

... and when you've done this, you'll have a better understanding of what's going on in the video.

 

i done thet all watched all suff and coded and showed you my code but i dont know why it dosent work normal what am i missing

 

If you are willing to optimize your code based on my comments above, then I will have a look at it. Normally I try to point people in the correct direction, rather than write code for them, but if you are completely stuck, I'll try to unstick you, but if I need to run through code, having it compact will make it much easier.

 

Take a look at mine, I'm having the same issue, it just bounces like a rabbit,

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. [System.Serializable]
5. public class SuspensionPoint
6. {
7.     public Transform t;
8.     public float CompressionRatio = 0.0f; // 0.0f - 1.0f
9.     public Vector3 SurfaceImpactPoint, SurfaceImpactNormal;
10.     private float RaycastDistance, suspensionForce;
11.     private int id;
12.  
13.     public SuspensionPoint (Transform _t, float rd, float sf, int _id)
14.     {
15.         this.id = _id;
16.         this.t = _t;
17.         this.RaycastDistance = rd;
18.         this.suspensionForce = sf;
19.     }
20.  
21.     public void UpdateMe (Transform ct, Rigidbody rb)
22.     {
23.         RaycastHit hit;
24.         if (Physics.Raycast (t.position, -ct.up, out hit, RaycastDistance))
25.         {
26.             this.CompressionRatio = hit.distance / RaycastDistance;
27.  
28.             rb.AddForceAtPosition (Vector3.up * this.CompressionRatio * suspensionForce, t.position, ForceMode.Acceleration);
29.  
30.             Debug.DrawRay (t.position, -ct.up * RaycastDistance, Color.green);
31.         }
32.         else
33.         {
34.             Debug.DrawRay (t.position, -ct.up * RaycastDistance, Color.red);
35.         }
36.     }
37.  
38.     public void Draw ()
39.     {
40.         Gizmos.DrawSphere (t.position, 0.2f);
41.     }
42.  
43.     public void DoGUI (Rect rect)
44.     {
45.         GUI.Label (rect, "CR (" + id + ")    :   " + this.CompressionRatio.ToString ());
46.     }
47. }
48.  
49. public class Vehicle : MonoBehaviour
50. {
51.     public Transform[] corners;
52.     public float RaycastDistance = 1.0f;
53.     public float suspensionForce = 30.0f;
54.  
55.     public ForceMode fm;
56.  
57.     SuspensionPoint[] suspensionPoints = new SuspensionPoint [4];
58.  
59.     void Start ()
60.     {
61.         suspensionPoints [0] = new SuspensionPoint (corners [0], RaycastDistance, suspensionForce, 0);
62.         suspensionPoints [1] = new SuspensionPoint (corners [1], RaycastDistance, suspensionForce, 1);
63.         suspensionPoints [2] = new SuspensionPoint (corners [2], RaycastDistance, suspensionForce, 2);
64.         suspensionPoints [3] = new SuspensionPoint (corners [3], RaycastDistance, suspensionForce, 3);
65.     }
66.  
67.     void FixedUpdate ()
68.     {
69.         foreach (SuspensionPoint point in this.suspensionPoints)
70.         {
71.             point.UpdateMe (transform, rigidbody);
72.         }
73.     }
74.  
75.     void OnDrawGizmos ()
76.     {
77.         if (!Application.isPlaying)
78.             return;
79.  
80.         foreach (SuspensionPoint point in this.suspensionPoints)
81.         {
82.             point.Draw ();
83.         }
84.     }
85.  
86.     void OnGUI ()
87.     {
88.         for (int i = 0; i < this.suspensionPoints.Length; i++)
89.         {
90.             this.suspensionPoints [i].DoGUI (new Rect (10, 10 + (30 * i), 1000, 100));
91.         }
92.     }
93. }

 

any update?