personal_username

It's a coulee of days* that I'm trying any resource I can to have a simple object rotate on its axis following my movements.

I'm using a Myo (but anything would be just fine as long as they have accelerometer, gyroscope and magnetometer and can be converted into euler, quaternion, vectors.

Would you pleeeease have a look at my patch and tell me why it's not working?

Thanks, any help, direction, insult will be greatly appreciated.

*much more, but i'm ashamed to admit it :-)-: **

It's a coulee of days* that I'm trying any resource I can to have a simple object rotate on its axis following my movements.
I'm using a Myo (but anything would be just fine as long as they have accelerometer, gyroscope and magnetometer and can be converted into euler, quaternion, vectors.
Would you pleeeease have a look at my patch and tell me why it's not working?

*much more, but i'm ashamed to admit it :-)-:  **
** Schrodinger smiley

fantastic-movements-and-where-to-find-them-help-with-rotations

what results are you getting that are unexpected? if you feed values to the quat attribute from a valid quaternion in the form x y z w, then your first technique should work.

https://www.youtube.com/watch?v=TGyyngoXw-s&feature=youtu.be

Tried a few empirical tricks (inverting the order xyzw, reversing some positive floats into negative and viceversa (surprisingly this provided the best result so far, with just one axe working opposite direction...), but nothing work perfect so far...

thanks for the reply.
Here's what happens...

As you can see it's not consistent.
Tried a few empirical tricks (inverting the order xyzw, reversing some positive floats into negative and viceversa (surprisingly this provided the best result so far, with just one axe working opposite direction...), but nothing work perfect so far...

looks like you simply need to provide an offset orientation for your gl object.

the easiest way to do that is to use two jit.anim.node objects. the first anim.node you bind to your 3d object (via a patch cord or the @anim attribute). this will now "take over" all spatial transform attributes, and expose additional features, such as parenting. the second anim.node you parent to the first anim.node (via patch cord or @anim attribute). you can apply an offset orientation to this anim.node via any of the rotation attributes (quat, rotate, rotatexyz).

Thanks Rob, but the divergence I see between the movements and their 3D representation cannot be fixed by tweaking/playing with the offset orientation only.

I am starting to guess if it's a Myo-related problem but throughout the forum I cannot see anyone else experiencing the same issue.

Looks like there is something messed up but I cannot understand what that is.

I'll post another video for reference in the next hour

Thanks Rob, but the divergence I see between the movements and their 3D representation cannot be fixed by tweaking/playing with the offset orientation only.
I am starting to guess if it's a Myo-related problem but throughout the forum  I cannot see anyone else experiencing the same issue.

Looks like there is something messed up but I cannot understand what that is.
I'll post another video for reference in the next hour


https://www.youtube.com/watch?v=4CYb2ZBbiWc

First I changed the order: i took the stream XYZW (the order Myo is supposed to stream), and I inverted it to YZWX.

Second i inverted the polarity of the "Z" axis (mistakenly reported as "Y" in the video).

Third, as Rob suggested, I played with the [rotatexyz] (thanks again!)

1) I am happy that is works now, even if I have no idea why it works

2) There might be probably other combinations to make it work, but why bother? ;-)

3) the reason why it didn't work as expected is still a mystery, if anyone can explain I would be grateful! ;-)

Ok, I did it.
Have no idea why it works, but it does.
Here's the video: https://www.youtube.com/watch?v=4CYb2ZBbiWc
And below the patch.

First I changed the order: i took the stream XYZW (the order Myo is supposed to stream), and I inverted it to YZWX.
Second i inverted the polarity of the "Z" axis (mistakenly reported as "Y" in the video).
Third, as Rob suggested, I played with the [rotatexyz] (thanks again!)

1) I am happy that is works now, even if I have no idea why it works
2) There might be probably  other combinations to make it work, but why bother? ;-)
3) the reason why it didn't work as expected is still a mystery, if anyone can explain I would be grateful! ;-)

Fantastic Movements and where to find them (help with rotations)