Bug where disabled euler angle print out causes spastic behavior

I'm not sure why this is happening (its a bug, so duh) but when I print the value of eulerAngles retrieved from an object my game operates correctly. Yet when those print statements are disabled via commenting them out, my game does not operate correctly. I have video to prove and describe the problem:

I'm sure the problem has something to do with the print statements because as you saw in the video, this only happens when I disable them, and that's the only thing I changed.

EDIT: I just found the source of it. Ive added a comment to the line responsible. Just enable it, leaving all other print statements disabled and the problem manifests.

The code I am using:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class SwivelGuns : MonoBehaviour
6. {
7.     static List<GameObject> barrels = new List<GameObject>(); //Refers to barrel objects
8.     static List<GameObject> bases = new List<GameObject>(); //Refers to base objects
9.     static List<GameObject> bulletSpawns = new List<GameObject>(); //Refers to barrel bullet spawn points
10.     static List<GameObject> gunLookers = new List<GameObject>();
11.     public float xMin, xMax, yMin, yMax;
12.     public float angleDelta;
13.     Gun[] gunScript;
14.  
15.     // Use this for initialization
16.     void Awake()
17.     {
18.         bases = GunController.getChildObjectsWithTag(gameObject, "GunBase");
19.         barrels = GunController.getChildObjectsWithTag(gameObject, "GunBarrel");
20.         bulletSpawns = GunController.getChildObjectsWithTag(gameObject, "BulletSpawn");
21.         gunScript = gameObject.GetComponentsInChildren<Gun>();
22.         gunLookers = GunController.getChildObjectsWithTag(gameObject, "GunLooker");
23.     }
24.  
25.     public static float clampAngle (float ang, float min, float max)
26.     { //Clamps the angle to the specified range! Works perfectly!
27.         float n = Mathf.Round(Mathf.Abs(ang / 360f)); //Find how ang goes in to 360
28.        // print("N = " + n);   <<<< This is the problem line I discovered. When commented out, the problem occurs, when enabled it does not.
29.         ang = Mathf.Abs(ang);
30.    
31.         if(ang >= 360f)  //If above 360
32.         {
33.             ang -= (360f * n); //Force the value down to less than 360
34.             //print("Angle was multiple of 360.");
35.         }
36.  
37.         if (ang < max && ang > min) //If in outside the range of the min and max
38.         {
39.             ang = (((max - min) / 2) < ang) ? max : min; //Using the ternary operator, if the angle value is further along than half way assign it the max value, otherwise give it the min.
40.         }
41.         return ang;
42.     }
43.  
44.  
45.     // Update is called once per frame
46.     void Update()
47.     {
48.         swivelGuns();
49.     }
50.  
51.     void swivelGuns()
52.     {
53.         float x, y;
54.         Utilities.MOUNT_NORMAL gunNormal;
55.         for (int i = 0; i != bulletSpawns.Count; i++)
56.         {
57.             gunNormal =  gunScript[i].normal;
58.             gunLookers[i].transform.LookAt(GunController.worldTarget);
59.             x = gunLookers[i].transform.localEulerAngles.x; //X value here is up/down from camera's perspective!
60.             y = gunLookers[i].transform.localEulerAngles.y; //Y is left/right
61.  
62.           //  print("Weapon: " + bulletSpawns[i].name  + "====" );
63.            // print("[A]  X= " + x + " Y= " + y);
64.        
65.  
66.             if (gunNormal == Utilities.MOUNT_NORMAL.UP)
67.             {
68.                 x = clampAngle(x, xMin, xMax);
69.                 y = clampAngle(y, yMin, yMax);
70.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
71.                                 new Vector3(0f, y, 0f), Time.deltaTime * angleDelta);
72.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
73.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
74.             }
75.             else if (gunNormal == Utilities.MOUNT_NORMAL.RIGHT)
76.             {
77.                 x = clampAngle(x, xMin, xMax);
78.                 y = clampAngle(y, yMin, yMax);
79.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
80.                                                 new Vector3( 0f, y,0f), Time.deltaTime * angleDelta);
81.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
82.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
83.             }
84.             else if (gunNormal == Utilities.MOUNT_NORMAL.LEFT)
85.             {
86.                 x = clampAngle(x, xMin, xMax);
87.                 y = clampAngle(-y, yMin, yMax);
88.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
89.                                                                 new Vector3(0f, y, 0f), Time.deltaTime * angleDelta);
90.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
91.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
92.             }
93.             else if (gunNormal == Utilities.MOUNT_NORMAL.DOWN)
94.             {
95.                 x = clampAngle(-x, xMin, xMax);
96.                 y = clampAngle(-y, yMin, yMax);
97.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
98.                                                 new Vector3(0f, y, 0f), Time.deltaTime * angleDelta);
99.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
100.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
101.             }
102.          //  print("[B] X= " + x + " Y= " + y);
103.  
104.         }
105.     }
106. }
107.  

 

use verbose topic titles since the forums are full of bugs.

 

Oops! How do you change the title of a thread? I can do that can't I?

 

Oh ok, didn't know of that, this honestly is the first bug I've ever discovered, and I'm still quite surprised I found it!
Will do.

 

thread tools, top right...

 

Yes. Its in the video. On line #30 of my SwivelGuns.CS file, if you simply enable it be removing the comment double slash ("//") it doesn't have this spastic behavior. If you disable it then it becomes a problem.

The code I'm working with:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class SwivelGuns : MonoBehaviour
6. {
7.     List<GameObject> barrels = new List<GameObject>(); //Refers to barrel objects
8.     List<GameObject> bases = new List<GameObject>(); //Refers to base objects
9.     List<GameObject> bulletSpawns = new List<GameObject>(); //Refers to barrel bullet spawn points
10.     List<GameObject> gunLookers = new List<GameObject>();
11.     GunController shipsTarget;
12.     public float xMin, xMax, yMin, yMax;
13.     public float angleDelta;
14.     Gun[] gunScript;
15.  
16.     // Use this for initialization
17.     void Awake()
18.     {
19.         bases = GunController.getChildObjectsWithTag(gameObject, "GunBase");
20.         barrels = GunController.getChildObjectsWithTag(gameObject, "GunBarrel");
21.         bulletSpawns = GunController.getChildObjectsWithTag(gameObject, "BulletSpawn");
22.         gunScript = gameObject.GetComponentsInChildren<Gun>();
23.         gunLookers = GunController.getChildObjectsWithTag(gameObject, "GunLooker");
24.         shipsTarget = gameObject.GetComponentInParent<GunController>() as GunController;
25.     }
26.  
27.     public static float clampAngle (float ang, float min, float max)
28.     { //Clamps the angle to the specified range! Works perfectly!
29.         float n = Mathf.Round(Mathf.Abs(ang / 360f)); //Find how ang goes in to 360
30.      //  print("N = " + n); //  <  <  Problem lies with this line
31.         ang = Mathf.Abs(ang);
32.      
33.         if(ang >= 360f)  //If above 360
34.         {
35.             ang -= (360f * n); //Force the value down to less than 360
36.             //print("Angle was multiple of 360.");
37.         }
38.  
39.         if (ang < max && ang > min) //If in outside the range of the min and max
40.         {
41.             ang = (((max - min) / 2) < ang) ? max : min; //Using the ternary operator, if the angle value is further along than half way assign it the max value, otherwise give it the min.
42.         }
43.         return ang;
44.     }
45.  
46.  
47.     // Update is called once per frame
48.     void Update()
49.     {
50.         swivelGuns();
51.     }
52.  
53.     void swivelGuns()
54.     {
55.         float x, y;
56.         Utilities.MOUNT_NORMAL gunNormal;
57.         for (int i = 0; i != bulletSpawns.Count; i++)
58.         {
59.             gunNormal =  gunScript[i].normal;
60.          
61.             gunLookers[i].transform.LookAt(shipsTarget.worldTarget);
62.             x = gunLookers[i].transform.localEulerAngles.x; //X value here is up/down from camera's perspective!
63.             y = gunLookers[i].transform.localEulerAngles.y; //Y is left/right
64.  
65.           //print("Weapon: " + bulletSpawns[i].name  + "====" );
66.            // print("[A]  X= " + x + " Y= " + y);
67.          
68.  
69.             if (gunNormal == Utilities.MOUNT_NORMAL.UP)
70.             {
71.                 x = clampAngle(x, xMin, xMax);
72.                 y = clampAngle(y, yMin, yMax);
73.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
74.                                 new Vector3(0f, y, 0f), Time.deltaTime * angleDelta);
75.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
76.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
77.             }
78.             else if (gunNormal == Utilities.MOUNT_NORMAL.RIGHT)
79.             {
80.                 x = clampAngle(x, xMin, xMax);
81.                 y = clampAngle(y, yMin, yMax);
82.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
83.                                                 new Vector3( 0f, y,0f), Time.deltaTime * angleDelta);
84.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
85.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
86.             }
87.             else if (gunNormal == Utilities.MOUNT_NORMAL.LEFT)
88.             {
89.                 x = clampAngle(x, xMin, xMax);
90.                 y = clampAngle(-y, yMin, yMax);
91.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
92.                                                                 new Vector3(0f, y, 0f), Time.deltaTime * angleDelta);
93.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
94.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
95.             }
96.             else if (gunNormal == Utilities.MOUNT_NORMAL.DOWN)
97.             {
98.                 x = clampAngle(-x, xMin, xMax);
99.                 y = clampAngle(-y, yMin, yMax);
100.                 bases[i].transform.localEulerAngles = Vector3.Slerp(bases[i].transform.localEulerAngles,
101.                                                 new Vector3(0f, y, 0f), Time.deltaTime * angleDelta);
102.                 barrels[i].transform.localEulerAngles = Vector3.Slerp(barrels[i].transform.localEulerAngles,
103.                     new Vector3(x, 0f, 0f), Time.deltaTime * angleDelta);
104.             }
105.          // print("[B] X= " + x + " Y= " + y);
106.  
107.         }
108.     }
109. }
110.  

I did file a bug report, I gave them my project but I had forgotten the project was broken at the time. The biggest problem was with the BulletState file, but that isn't the problem so it can just be removed to see the bug.