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2014/10/15 ¤U¤È 10:05:08
iphone Programming Glossary: cmattitudeUse Quaternions to compute yaw, pitch and roll from iphone? http://stackoverflow.com/questions/12322797/use-quaternions-to-compute-yaw-pitch-and-roll-from-iphone share improve this question You don't have to implement anything the API provides the quaternion for you CMAttitude Class Reference quaternion propery I personally like rotation matrices better because I find them easier to understand and..
Drifting yaw angle after moving fast http://stackoverflow.com/questions/13613239/drifting-yaw-angle-after-moving-fast angle after moving fast In my current project I ran into trouble regarding the quaternion provided by Core Motion's CMAttitude. I put the iPhone 5 iOS 6.0.1 at a well defined start position. Then I start to move the device quickly around like in a.. longer available Core Motion Teapot sample to validate the effect. The Euler Angles for logging are read directly from CMAttitude NSLog @ pitch f roll f yaw f attitude.pitch 180 M_PI attitude.roll 180 M_PI attitude.yaw 180 M_PI I found this on two different.. for strategical considerations I think most developers do tilt motion detection with the gravity vector rather than CMAttitude.quaternion because most people are not that amused about quaternion maths Thus any future bugs related to the gravity vector..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code but recommended a reference attitude object So in your interface definition you add CMMotionManager motionManager CMAttitude referenceAttitude According to the docs you should only create one of these managers per application. I recommend making.. the gyro and updating its attitude property. void enableGyro CMDeviceMotion deviceMotion motionManager.deviceMotion CMAttitude attitude deviceMotion.attitude referenceAttitude attitude retain motionManager startGyroUpdates For virtual reality applications.. motion. GLfloat rotMatrix 16 void getDeviceGLRotationMatrix CMDeviceMotion deviceMotion motionManager.deviceMotion CMAttitude attitude deviceMotion.attitude if referenceAttitude nil attitude multiplyByInverseOfAttitude referenceAttitude CMRotationMatrix..
Compensating compass lag with the gyroscope on iPhone 4 http://stackoverflow.com/questions/4212988/compensating-compass-lag-with-the-gyroscope-on-iphone-4 data from the gyroscope. Using CMMotionManager and its CMDeviceMotion object motionManager.deviceMotion I get the CMAttitude object. Correct me if I'm wrong please but here is what I've deduced from the CMAttitude object's yaw property I don't need.. I get the CMAttitude object. Correct me if I'm wrong please but here is what I've deduced from the CMAttitude object's yaw property I don't need pitch nor roll for my purposes yaw ranges from 0 to PI when the phone is pointing downwards..
iphone - core motion (relative rotation) http://stackoverflow.com/questions/5053793/iphone-core-motion-relative-rotation what you're looking for by drilling down into the properties of CMMotionManager through CMDeviceMotion and finally to CMAttitude . The attitude of the device is defined as the orientation of a body relative to a given frame of reference. In the case.. device is defined as the orientation of a body relative to a given frame of reference. In the case of DeviceMotion's CMAttitude that frame of reference is established by the framework when starting device motion updates. From that point in time on.. on the attitude of the device is reported relative to that reference frame not relative to the previous frame . The CMAttitude class provides some handy built in functionality to convert a CMAttitude to a form that is actually useful for something..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare startDeviceMotionUpdatesToQueue NSOperationQueue currentQueue withHandler ^ CMDeviceMotion motion NSError error CMAttitude attitude motion.attitude NSLog @ pitch f roll f yaw f attitude.pitch attitude.roll attitude.yaw I'm thinking that I could..
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