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POCMMotionManager vs UIAccelerometer efficiency
 

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  1. POCMMotionManager vs UIAccelerometer efficiency
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    <p>I've been working on an <a href="https://github.com/promet/PRAugmentedReality" rel="nofollow">AR framework</a> for a while now and am trying to <a href="https://github.com/promet/PRAugmentedReality/issues/23" rel="nofollow">update from UIAccelerometer (deprecated) to CMMotionManager</a> but am running into some efficiency problems?</p> <p>Basically it seems like CMMotionManager is MUCH larger and slower than UIAccelerometer is. Has anyone experienced performance issues with CMMotionManager before?</p> <hr> <p>As you can see <a href="https://github.com/promet/PRAugmentedReality/blob/master/Classes/Location/LocationWork.m" rel="nofollow">here</a>, I had this:</p> <pre><code>accelerometer = [UIAccelerometer sharedAccelerometer]; accelerometer.updateInterval = 0.01; [accelerometer setDelegate:self]; </code></pre> <p>and</p> <pre><code>-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { rollingZ = (acceleration.z * kFilteringFactor) + (rollingZ * (1.0 - kFilteringFactor)); rollingX = (acceleration.y * kFilteringFactor) + (rollingX * (1.0 - kFilteringFactor)); if (rollingZ &gt; 0.0) currentInclination = inc_avg(atan(rollingX / rollingZ) + M_PI / 2.0); else if (rollingZ &lt; 0.0) currentInclination = inc_avg(atan(rollingX / rollingZ) - M_PI / 2.0); else if (rollingX &lt; 0) currentInclination = inc_avg(M_PI/2.0); else if (rollingX &gt;= 0) currentInclination = inc_avg(3 * M_PI/2.0); } </code></pre> <p>and all works great even on "older" devices like the iPhone 4 (not really old but yea...).</p> <p>But when trying the exact same code but with CMMotionManager:</p> <pre><code>motionManager = [[CMMotionManager alloc] init]; </code></pre> <p>with</p> <pre><code>[motionManager setAccelerometerUpdateInterval:0.01]; [motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] withHandler: ^(CMAccelerometerData *accelerometerData, NSError *error){ rollingZ = (accelerometerData.acceleration.z * kFilteringFactor) + (rollingZ * (1.0 - kFilteringFactor)); rollingX = (accelerometerData.acceleration.y * kFilteringFactor) + (rollingX * (1.0 - kFilteringFactor)); if (rollingZ &gt; 0.0) currentInclination = inc_avg(atan(rollingX / rollingZ) + M_PI / 2.0); else if (rollingZ &lt; 0.0) currentInclination = inc_avg(atan(rollingX / rollingZ) - M_PI / 2.0); else if (rollingX &lt; 0) currentInclination = inc_avg(M_PI/2.0); else if (rollingX &gt;= 0) currentInclination = inc_avg(3 * M_PI/2.0); }]; </code></pre> <p>The math seems to slow the crap out of it..! I say this because when I remove all the math part it works great.</p> <p>An iPhone 5 will work alright but an iPhone 4S will show signs of lag and the iPhone 4 will just freeze... </p> <p>(I can give you more details if you want but its relatively complicated to explain)</p>
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