Rotating object within bounds using gyroscope

Question

I've been playing around with the gyroscope for a bit now and am having some trouble achieving the effect i'm after.

I'm trying to rotate an object using the Gyro but within a limited min max rotation (i.e. -90 to 90 on Y and -20 to 20 on the Z for example).

I've tried using the gyro.attitude but it's information is absolute to the devices orientation. So not super usable for this application.

using gyro.rotationRate gives gyro rotation velocity, which i can then add to the object's localEulerAngle. The problem is when the rotation reaches <0 i get popping and clipping. I realize this is due to eulerAngles not accepting -values.

I've tried getting this to work various ways using localRotation and quaternions but my results are worse off.

 var lowerLimitY : float = -40;
 var upperLimitY : float = 40; 
 var lowerLimitX : float = -10;
 var upperLimitX : float = 10;
 var lowerLimitZ : float = -20;
 var upperLimitZ : float = 20;
  
 var newRotation : Vector3;
 var lastRotation : Vector3;
 private var gyroRotRate : Vector3;
 
 function Update () {
     if (gyroBool) {
         
         gyroRotRate = gyro.rotationRate;    
         label.text = "Gyro Rotation Rate = " + gyroRotRate;
         
         //gyro deadzone // sensitivity
         if(gyroRotRate.x > 0.1 || gyroRotRate.y > 0.1 || gyroRotRate.z > 0.1)
             {
                 newRotation = lastRotation + gyroRotRate;
             }
         
         else if(gyroRotRate.x < -0.1 || gyroRotRate.y < -0.1 || gyroRotRate.z < -0.1)
             {
                 newRotation = lastRotation + gyroRotRate;
             }
         label3.text = "New Rotation: " + newRotation;
         label4.text = "Last Rotation: " + lastRotation;
                                                 
     }
     else{label.text = "NO GYRO";
     }
 }
 
 
 function LateUpdate()
 {
 
 if(newRotation.x > upperLimitX) {transform.eulerAngles.x = upperLimitX; }
 else if(newRotation.x < lowerLimitX) {transform.eulerAngles.x = lowerLimitX; }
 else{transform.eulerAngles.x = newRotation.x;}
 
 if(newRotation.y > upperLimitY) {transform.eulerAngles.y = upperLimitY; }
 else if(newRotation.y < lowerLimitY) {transform.eulerAngles.y = lowerLimitY;}
 else{transform.eulerAngles.y = newRotation.y;}
 
 if(newRotation.z > upperLimitZ) {transform.eulerAngles.z = upperLimitZ; }
 else if(newRotation.z < lowerLimitZ) {transform.eulerAngles.z = lowerLimitZ; }
 else{transform.eulerAngles.z = newRotation.z;}
 
 lastRotation = transform.localEulerAngles;
 
 label2.text = "Object Adjusted EulerAngle = " + transform.eulerAngles;
 }

Any ideas/suggestions of what i'm doing wrong?

Answer 1

Answer by ScroodgeM · Jul 27, 2012 at 03:47 PM

after you got gyro.attitude what can't you multiply with device's base rotation to get rotation you need?

then... limiting rotation speed and angle:

Rotater.cs

using UnityEngine;
public class JustForTestCode : MonoBehaviour
{
    public Vector3 Limits = Vector3.one * 50f;
    public Vector3 Speeds = Vector3.one * 10f;
    public Transform targetRotation;
    Vector3 myRotation = Vector3.zero;
    void Update()
    {
        Vector3 targetEuler = targetRotation.rotation.eulerAngles;
        for (int i = 0; i <= 2; i++)
        {
            myRotation[i] = Mathf.Clamp(Mathf.MoveTowards(myRotation[i], Mathf.Repeat(targetEuler[i] + 180f, 360f) - 180f, Time.deltaTime * Speeds[i]), -Limits[i], Limits[i]);
        }
        transform.rotation = Quaternion.Euler(myRotation);
    }
}

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Rotating object within bounds using gyroscope

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Rotater.cs

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