2014/10/15 下午 10:13:13

iphone Programming Glossary: referenceattitude

http://stackoverflow.com/questions/2600779/how-can-i-customize-an-ios-alert-view

http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code

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 motionManager.. in your init method you should allocate the motion manager object like so motionManager CMMotionManager alloc init referenceAttitude nil When you want to enable the gyro you could create an enableGyro method or just call it from the init method. The following.. void enableGyro CMDeviceMotion deviceMotion motionManager.deviceMotion CMAttitude attitude deviceMotion.attitude referenceAttitude attitude retain motionManager startGyroUpdates For virtual reality applications using the gyro and OpenGL is pretty simple...

Getting displacement from accelerometer data with Core Motion

http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion

the attitude. To find out the camera rotation is very simple with the Gyroscope and Core Motion. I do it this way if referenceAttitude nil attitude multiplyByInverseOfAttitude referenceAttitude CMRotationMatrix mat attitude.rotationMatrix GLfloat rotMat mat.m11.. with the Gyroscope and Core Motion. I do it this way if referenceAttitude nil attitude multiplyByInverseOfAttitude referenceAttitude CMRotationMatrix mat attitude.rotationMatrix GLfloat rotMat mat.m11 mat.m21 mat.m31 0 mat.m12 mat.m22 mat.m32 0 mat.m13..