personal_username

I'm having a hard time trying to figure out how to achieve what's shown in the attached picture.

Simply put: i want to recalibrate the absolute position of a sensor so that by pressing a button whatever position it has, it will be considered the default orientation in all the three axis.

I'm using quaternion from a sensor fusion device, but also being able to recalibrate a 3 axis magnetometer would be great.

I'm having a hard time trying to figure out how to achieve what's shown in the attached picture.
Simply put: i want to recalibrate the absolute position of a sensor so that by pressing a button whatever position it has, it will be considered the default orientation in all the three axis.
I'm using quaternion from a sensor fusion device, but also being able to recalibrate a 3 axis magnetometer would be great.

sensor-3d-object-calibration-offset

If You would provide the range, values etc of the sensor, one might help You.

In the following patch I better explain what I'm looking for, taking as a starting point your patch.

thanks for your replies.
In the following patch I better explain what I'm looking for, taking as a starting point your patch.
Hope this makes it clear!

PS for everything to load properly it's better to save it and relaunch it ;-)

I don't know what You are after, I mean rendering 4 float numbers into shape and the rest of it,

but offsetting 4 values going from -1. to 1. should work similar to example with 360 degrees.

just using {- 0.} -> {% 2.} or maybe {+ 0.} depending on orientation.

I don't know what You are after, I mean rendering 4 float numbers into shape and the rest of it,
but offsetting  4 values going from -1. to 1. should work similar to example with 360 degrees.
just using {- 0.} -> {% 2.} or maybe {+ 0.} depending on orientation.


Ladd would be very handy to offset the list.

To set a new origin you should be able to treat position and orientation independently.

Subtract the absolute position captured at calibration from the incoming absolute position (e.g. using [vexpr $f1 - $f2]).

It's kind of the same idea, but with quaternions it uses inverse multiplication rather than subtraction. That is, to 'un-rotate' the incoming quaternion from the quaternion captured at calibration, you multiply it by the calibration quaternion's conjugate. The conjugate is achieved by multiplying the quaternion's x,y.z values by -1 and the w value by +1.

Subtract the absolute position captured at calibration from the incoming absolute position (e.g. using [vexpr $f1 - $f2]).  

It's kind of the same idea, but with quaternions it uses inverse multiplication rather than subtraction. That is, to 'un-rotate' the incoming quaternion from the quaternion captured at calibration, you multiply it by the calibration quaternion's conjugate. The conjugate is achieved by multiplying the quaternion's x,y.z values by -1 and the w value by +1. 

[sensor, 3d object] Calibration / offset