Limit Y axis movement, allow -y axis.

I placed notes along the way to help explain. Basically I need the Y axis locked until the ground tile catches you. Then you need to fall. Right now you just fly around and the game does not end.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class FreezePosition : MonoBehaviour
7. {
8.     Rigidbody sphereRB;
9.     private bool isCarGrounded;
10.     public LayerMask groundLayer;
11.  
12.    
13.    
14.  
15.     // Update is called once per frame
16.     void FixedUpdate()
17.     {
18.             //This keeps the vehicle working and gives the if statement information.
19.         RaycastHit hit;
20.         isCarGrounded = Physics.Raycast(transform.position, -transform.up, out hit, 1f, groundLayer);
21.  
22.  
23.             //This stops a bobble in Y axis from the vehicle controller and I get a debug log in the console.
24.  
25.         sphereRB = GetComponent<Rigidbody>();
26.         sphereRB.constraints = RigidbodyConstraints.FreezePositionY |   RigidbodyConstraints.FreezePositionY;
27.         Debug.Log("locked");
28.     }
29.             //This is supposed to turn off the constraints so the vehicle will fall when you run off ground.
30.             //I get a debug print in console that it ran, but the vehicle does not fall.
31.     void Update()
32.     {
33.         if (isCarGrounded)
34.         {
35.             return;
36.         }
37.         else
38.         {
39.             sphereRB.GetComponent<Rigidbody>().constraints = RigidbodyConstraints.None;
40.         }
41.        
42.  
43.     }
44.  
45.  
46. }
47.  
48. // I have no idea on how to get this to work.  Ethier the vehicle wont fall, or the bobbel is back.  I have tried them under start
49. // and every place else along with many other things.
50.  

 

So if I'm understanding correctly, you want to constrain the Y position while the car is 1 unit from the ground?

There's a few errors I noticed in your code, which didn't really help trying to understand what you were doing. Here's what I presume you wanted, but cleaned up.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. public class FreezePosition : MonoBehaviour
5. {
6.     Rigidbody sphereRB;
7.     public LayerMask groundLayer;
8.  
9.     void Start()
10.     {
11.         sphereRB = GetComponent<Rigidbody>(); // don't need to set the reference every time
12.     }
13.  
14.     void FixedUpdate()
15.     {
16.         RaycastHit hit;
17.         // why did you use -transform.up when there's a transform.down?
18.         bool isCarGrounded = Physics.Raycast(transform.position, transform.down, out hit, 1f, groundLayer);
19.  
20.         if (isCarGrounded)  // no reason to wait until Update to change this, why not change it at the time of raycast
21.         {
22.             // here you did FreezePositionY | FreezePositionY, where I think you wanted one of them to be rotation
23.             sphereRB.constraints = RigidbodyConstraints.FreezePositionY | RigidbodyConstraints.FreezeRotationY;
24.             Debug.Log("locked");
25.         }
26.         else
27.         {
28.             sphereRB.constraints = RigidBodyConstraints.None;
29.             Debug.Log("unlocked");
30.         }
31.     }
32. }

 

I appreciate your work, it, however did not do what I needed.

What I need to do is have the sled run dead flat no upward movement (keeps player from going up the canyon wall). I achieved the dead flat driving by using the constraints in the rigid body inspector freezing the Y rotation and it worked like a charm until, the collapsing ground tiles catch up with you. Then you are locked in the Y axis, don't fall and the game basically breaks because there is no end.

What I am trying to do with this script is lock the vehicle in Y axis until there is no ground and then it can fall. Once it falls, there is a trigger that will end the game.

The script for the vehicle is a hodgepodge of other scripts and the vehicle works fine except for this one part.