We Keep Coding

Weird Wheel spinning in unity

i was working on a simple car controller script and a humvee model i downloaded. the script works as its supposed to but the car wheels are out of place and are spinning crazy. i tried searching everywhere but didn't found any solution.
here's the code:
using UnityEngine;
public class GroundVehicleController : MonoBehaviour {
public void GetInput()
{
m_horizontalInput = Input.GetAxis("Horizontal");
m_verticalInput = Input.GetAxis("Vertical");
}
private void Steer()
{
m_steeringAngle = maxSteerAngle * m_horizontalInput;
frontDriverW.steerAngle = m_steeringAngle;
frontPassengerW.steerAngle = m_steeringAngle;
}
private void Accelerate()
{
frontDriverW.motorTorque = m_verticalInput * motorForce;
frontPassengerW.motorTorque = m_verticalInput * motorForce;
}
private void UpdateWheelPoses()
{
UpdateWheelPose(frontDriverW, frontDriverT);
UpdateWheelPose(frontPassengerW, frontPassengerT);
UpdateWheelPose(rearDriverW, rearDriverT);
UpdateWheelPose(rearPassengerW, rearPassengerT);
}
private void UpdateWheelPose(WheelCollider _collider, Transform _transform)
{
Vector3 _pos = _transform.position;
Quaternion _quat = _transform.rotation;
_collider.GetWorldPose(out _pos, out _quat);
_transform.position = _pos;
_transform.rotation = _quat;
}
private void FixedUpdate()
{
GetInput();
Steer();
Accelerate();
UpdateWheelPoses();
}
private float m_horizontalInput;
private float m_verticalInput;
private float m_steeringAngle;
public WheelCollider frontDriverW, frontPassengerW;
public WheelCollider rearDriverW, rearPassengerW;
public Transform frontDriverT, frontPassengerT;
public Transform rearDriverT, rearPassengerT;
public float maxSteerAngle = 30;
public float motorForce = 50;
}

The error on Unity console is telling you the problem:
UnassignedReferenceException: The variable frontDriverW of
groundVehicleController has not been assigned. You problably need to
assign the frontDriverW variable of the GroundVehicleController script
in the inspector.
Well, when your script runs, it tries to access the field frontDriverW, but since it was never assigned a value, it throws the mentioned exception.
You need to go in the inspector for the object that contains the GroundVehicleController script and add a value for the frontDriverW field. While you're there, make sure all the other fields have values too, because if they don't, those will also cause the same error.
From the pictures you've show us, it is not possible to know in which object you added the GroundVehicleController script, but just check all of the Humvee objects until you find it in the inspector. My guess is that it will probably be in the object Wheels, or the object Humvee.

a) Check the prefab you've created to see if these offsets are there even on the prefab.
b) You're updating the wheel pose with global positions and rotations. this is probably what is causing the offsets. try setting the pose local, or just make the wheel meshes follow whatever the wheel colliders are doing, make sure they're all under the same co-ordinate space. Why not just child each individual wheel to it's corresponding wheel collider? theyre just meshes after all.
c) You haven't assigned your wheel meshes at all in your script.
c) play around with different mass values on the RigidBody (keep it heavy), and also consider attaching a physic material to your wheel colliders to reduce slip and spinning (If the car controller already doesnt have a slip setting)

Activating animation when within radius

I am trying to create a script for my enemy turret, but it is not going well. I have a couple animations of the turret being activated and deactivated. What I need is that based on the distance from the player, it plays either animation. So once it moves inside the detection radius it plays the activation animation and once it is outside it plays the deactivation animation. Most of the other ways I try require me to create an Animation Controller, which I have little experience in using. I want a simple way to play one animation once it is inside and play a different one when it is outside. I think there was a way to store the animation clip in the script, and then play it. I have attached my current script, so you know what I mean.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class EnemyTurret : MonoBehaviour
{
public GameObject Player;
public float DistanceToPlayer;
public float DetectionRadius = 75;
// Start is called before the first frame update
void Start()
{
Player = GameObject.FindGameObjectWithTag("PlayerTank");
}
// Update is called once per frame
void Update()
{
DistanceToPlayer = Vector3.Distance(transform.position, Player.transform.position);
if (DistanceToPlayer<=DetectionRadius)
{
Debug.Log("Within Radius");
}
if (DistanceToPlayer >= DetectionRadius)
{
Debug.Log("Outside Radius");
}
}
}

Calculating and checking the distance of the player for every update() is not ideal. It will work, but it will do more work than it needs to when the player isn't even near it. Its not efficient.
What you may want to do if your player is a Rigidbody, is add a SphereCollider to the turret, set isTrigger=true, set the radius to be your detection radius, and handle the OnTriggerEnter() and OnTriggerExit() events to play or stop animations.
You can also add two public Animiation objects to the script, drag and drop your animations in the editor, then you can use animation.Play() and .Stop() etc. to control the animations.
Something similar to this. Not tested fully, but you can get the idea.
public float detectionRadius = 75;
public Animation activateAnimation;
public Animation deactivateAnimation;
void Start()
{
SphereCollider detectionSphere = gameObject.AddComponent<SphereCollider>();
detectionSphere.isTrigger = true;
detectionSphere.radius = detectionRadius;
detectionSphere.center = Vector3.zero;
}
private void OnTriggerEnter(Collider other)
{
if (other.gameObject.tag == "PlayerTank")
{
activateAnimation.Play();
}
}
private void OnTriggerExit(Collider other)
{
if (other.gameObject.tag == "PlayerTank")
{
deactivateAnimation.Play();
}
}
Your animations must not loop otherwise you will have to add more logic to check if animation.isPlaying and do your own animation.Stop() etc.

Unity3d progress bar

I am developing a game using unity3D and I need help making a progress time bar such that on collecting particular items time is added and thus the game continues.

Create a UI Image that is of type Filled. Use horizontal or vertical fill depending on your progress bar. Then from inside a script you can manipulate the value of the image. I will give you a very simple c# example. For the rest you can just use google and read the unity scripting API.
public class Example: MonoBehaviour {
public Image progress;
// Update is called once per frame
void Update ()
{
progress.fillAmount -= Time.deltaTime;
}
}

U could use a slider en slider.setvalue.
Example:
//to use this add first a slider to your canvas in the editor.
public GameObject sliderObject; //attachs this to the slider gameobject in the editor or use Gameobject.Find
Slider slider = sliderObject.GetComponent<Slider>();
float time;
float maxtime; //insert your maxium time
void start(){
slider.maxValue = maxtime;
}
void update()
{
time += Time.deltaTime;
if (time < maxtime)
{
slider.value = time;
}
else
{
Destroy(sliderObject);
//time is over, add here what you want to happen next
}
}

How do I access an updated variable between two scripts in Unity with C#?

Hopefully this isn't too much detail, I'm not used to asking programming questions.
I'm attempting to do the 3D Video Game Development with Unity 3D course that's on Udemy, though using C# instead of Javascript. I just finished up the tutorial that involves creating a space shooter game.
In it, a shield is created by the user when pressing a button. The shield has a "number of uses" variable that does not actually get used by the time the tutorial has finished. I'm trying to add it in, and have successfully managed to implement it so that with each use, we decrease the number of uses remaining, and no longer are able to instantiate the shield once that number is <=0.
This variable is stored on the player, and if I print it from the player, it returns the value I would expect.
However, I'm using a separate SceneManager.cs (this is where the tutorial placed the lives, and score, and timer variables ) where I print numbers into the GUI. My problem is that I cannot get my number of uses variable to stay current when I try to print it from the scene manager... it registers the initial value, but doesn't update after that.
Here is the Player Script
using UnityEngine;
using System.Collections;
public class player_script : MonoBehaviour {
// Inspector Variables
public int numberOfShields = 2; // The number of times the user can create a shield
public Transform shieldMesh; // path to the shield
public KeyCode shieldKeyInput; // the key to activate the shield
public static bool shieldOff = true; // initialize the shield to an "off" state
public int NumberOfShields
{
get{return numberOfShields;}
set{numberOfShields = value;}
}
// Update is called once per frame
void Update()
{
// create a shield when shieldKey has been pressed by player
if (Input.GetKeyDown (shieldKeyInput)) {
if(shieldOff && numberOfShields>0)
{
// creates an instance of the shield
Transform clone;
clone = Instantiate (shieldMesh, transform.position, transform.rotation) as Transform;
// transforms the instance of the shield
clone.transform.parent = gameObject.transform;
// set the shield to an on position
shieldOff = false;
// reduce the numberOfShields left
numberOfShields -=1;
}
}
print ("NumberOfShields = " + NumberOfShields);
}
public void turnShieldOff()
{
shieldOff = true;
}
}
when I run "print ("NumberOfShields = " + NumberOfShields);" I get the value I expect. (astroids trigger the turnShieldOff() when they collide with a shield.
Over in my Scene Manager however... this is the code I'm running:
using UnityEngine;
using System.Collections;
public class SceneManager_script : MonoBehaviour {
// Inspector Variables
public GameObject playerCharacter;
private player_script player_Script;
private int shields = 0;
// Use this for initialization
void Start ()
{
player_Script = playerCharacter.GetComponent<player_script>();
}
// Update is called once per frame
void Update ()
{
shields = player_Script.NumberOfShields;
print(shields);
}
// GUI
void OnGUI()
{
GUI.Label (new Rect (10, 40, 100, 20), "Shields: " + shields);
}
}
Any idea what I'm doing wrong that prevents shields in my SceneManager script from updating when NumberOfShields in my player_script updates?

I think you might have assigned a prefab into playerCharacter GameObject variable instead of an actual in game unit. In this case it will always print the default shield value of prefab. Instead of assigning that variable via inspector try to find player GameObject in Start function. You can for example give your player object a tag and then:
void Start() {
playerCharacter = GameObject.FindGameObjectWithTag("Player");
}

OnGui elements interacting with other OnGui elements

Within my 2d game i wsih to have a number of OnGui elements there for the user to select, however, the cursor that im using is another ongui element(using kinect to navigate) is this possible by any chance, at the moment im using planes but i will be zooming in and out of the camera so ill essentially need them attatched to the screen. Any ideas, suggestions or workarounds.
THis is currently my cursor.
using UnityEngine;
using System;
using System.Collections;
public class PillarAgent : MonoBehaviour {
public SkeletonWrapper sw;
public Vector3 distance;
public float progress =0f;
public Texture2D cursor;
public Texture2D load;
public Camera mainCam;
public float startTime;
private int roundedRestSecounds;
// Use this for initialization
float differencex = 0;
float differencey = 0;
void Start () {
distance =new Vector3(0f,0f,0f);
}
float translate(float value, float leftMin, float leftMax,
float rightMin,float rightMax)
{
float leftSpan = leftMax - leftMin;
float rightSpan= rightMax - rightMin;
float valueScaled = (value-leftMin)/(leftSpan);
return rightMin+(valueScaled * rightSpan);
}
// Update is called once per frame
void Update () {
if (sw.pollSkeleton())
{
distance.x=sw.bonePos[0,0].x - sw.bonePos[0,7].x;//5 is left shoulder
distance.y=sw.bonePos[0,0].y -sw.bonePos[0,7].y;
differencex=translate(distance.x,.6f,0,0,Screen.width);
differencey=translate(distance.y,-.5f,0,0,Screen.height);
//Debug.Log();
float width = sw.bonePos[0,5].x+ sw.bonePos[0,9].x;
float height =sw.bonePos[0,4].y- sw.bonePos[0,0].y;
float heightdiv= (height/2)+sw.bonePos[0,0].y;
}
}
void OnGUI() {
//left top width height
Rect r = new Rect(differencex,differencey,80,50);
GUI.Label(r,cursor);
GUI.BeginGroup(new Rect(differencex,differencey+50,50*Mathf.Clamp01(progress),15));
//Debug.Log(progress);
GUI.DrawTexture(new Rect(0,0,50,50),load);
GUI.EndGroup();
transform.position =mainCam.ScreenToWorldPoint(new Vector3(differencex,Screen.height-differencey,50));
//mainCam.fieldOfView()
}
void OnCollisionStay(Collision Other)
{
startTime+=Time.deltaTime;
if(Other.gameObject.GetComponent(typeof(TextControl)))
{
roundedRestSecounds=Mathf.CeilToInt(Time.time);
progress = Time.time *0.2f;
CurrentState=true;
}
else if(Other.gameObject.tag==("Scalpal")){
progress = startTime *0.5f;
//scallpall activated
//
}
}
void OnCollisionExit(Collision Other){
startTime =0f;
progress =0f;
}
public Boolean CurrentState{get;set;}
}
The next class is essentially the class in which i pick up my tools, currently this code doesnt work(not sure why), but what i wish to do is select some tools which show up on the screen so that i can use them,for e.g pick up paint brush start painting bricks or what not. at the moment i have my tools on a plane, i wish to always have them on the screen at all times when the camera moves.
using UnityEngine;
using System.Collections;
public class SelectTool : MonoBehaviour {
public Tools tools;
public float startTime;
public bool ScalpalSelected;
public GameObject selectedTool;
void Start()
{
tools = this.GetComponent<Tools>(); //in order to use this tools muyst be attached to the game object
//this is essentially saying with regards to this game object get the component named tools
}
void update()
{
}
void OnCollisionStay(Collision Other)
{
startTime +=Time.deltaTime;
if(startTime >5f){
if(Other.collider.tag==("Scalpal"))
{
selectedTool = Other.collider.gameObject;
Debug.Log(selectedTool+" What in gods good name is:" +tools.utilities[0]);
}
else {
selectedTool=null;
}
if(selectedTool){
for(int i=0;i<tools.utilities.Length;i++)
{
}
}
ScalpalSelected=true;
renderer.material.color = Color.yellow;
}
}
void OncollisionStay(Collision other){
startTime = 0f;
}
}

From the comment section to the question I will assume that you want to know how to do this:
"... you want your plane objects to move together with the camera ..." - Steven Mills
"thank you #StevenMills Do you have any example of how this can be done?" j bel
While the answer provided in the comments is to just manually add the planes as children of the camera (a very straightforward, manual approach), I will give another way to do this through scripting (in light of maybe this will help someone else out disregarding the likeliness of someone using this solution).
The idea of this is to create a script (thus following being attached to the MainCamera) that will search through all of the GameObject in the Object Hierarchy with the method GameObject.FindGameObjectsWithTag. Once we have all our GameObject with the associated Tag, we can then loop through the array and parent the attached script's GameObject to each.
public class ParentGameObjects : MonoBehaviour {
//The tag to search for on all game objects in the hierarchy
public String objectTag;
//The game objects that we will parent the main camera to
private GameObject[] children;
//It's not necessary to store references to the children but if you want to modify them at some point you will be able to
void Start() {
//Find all game objects with the tag we want
children = GameObject.FindGameObjectsWithTag(objectTag);
//Loop through all of the game objects found and parent this object's transform
for(int i = 0; i < children.Length; i++) {
children[i].transform.parent = transform;
}
}
}
Now, there are a few things you have to do for this script to work:
Attach this script to any GameObject that you want to parent other objects to.
In the Inspector of the GameObject that the script is attached to, enter in the name of the Tag you want to use.
For all GameObject(s) in the Hierarchy that should be added as children, assign the same Tag.
Of course there are other things you can do like, for example, instead of only searching for one Tag be able to search for multiple but that requires a bit (not exactly much) more work. Nonetheless, I hope this will at least be useful information to someone on how parenting works via scripting.