[PD] MARG (Was: Sensors2OSC mapping challenge)

[Max]

Attached is the C code from the paper linked below.
Before I try, should I attempt to make this in Pd as an abstraction or 
just take this c code and see if I can turn it into an external?

Or maybe someone has already done it?


On 2017년 07월 27일 09:17, katja wrote:
> Hi Max,
> 
> To emulate 3D orientation from gyro, accelerometer and compass data is
> most efficiently done using a 'quaternion filter'. Sebastian Madgwick
> has popularized the method, see
> http://x-io.co.uk/open-source-imu-and-ahrs-algorithms/. I use
> Madgwicks implementation of Mahoney's method, for Arduino based
> 'electronic hands', and found that Mahoney's algorithm for IMU sensors
> (gyro and accelerometer only) worked much better than Madgwick's own
> algorithm. But I had to make a few modifications, based on Kris
> Winer's work (https://github.com/kriswiner).
> 
> Katja
> 
> On Tue, Jul 25, 2017 at 11:13 PM, Max <abonnements at revolwear.com> wrote:
>> Made a quick little video
>> https://vimeo.com/226958567
>> the described issue is still there.
>>
>> Background on the problem:
>> https://stackoverflow.com/questions/27106607/get-rotation-and-display-in-degrees
>> https://stackoverflow.com/questions/15315129/convert-magnetic-field-x-y-z-values-from-device-into-global-reference-frame#15317814
>>
>>
>>
>> On 2017년 07월 08일 23:16, Max wrote:
>>>
>>> I've played around with the Android app Sensors2OSC [1] and was trying to
>>> just map the senors to a virtual model of a phone.
>>> I was able to get the axis individually mostly behaving correctly, but as
>>> soon as the phone moves around in more than one way, it is doing weird
>>> things. I started to wonder if it is only my phone though.
>>>
>>> At https://github.com/mxa/GemVR the patch ReceiveSensors2OSC.pd has
>>> everything ready to map the senor data to the Gem model.
>>>
>>> I'd be curious to see if it is possible to let it behave correctly.
>>>
>>> [1] https://sensors2.org/osc/
>>>
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>>
>>
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