topic Re: How to change the rotation order xyz to zyx ,but have the same performance? in Maya Forum

How to change the rotation order xyz to zyx ,but have the same performance?

Anonymous — Fri, 15 Oct 2021 12:56:56 GMT

i change the rotate order xyz to zyx the bone pos changed, but the transform attributes not changed.i just want to change the rotate order and don't change the bone performance

Re: How to change the rotation order xyz to zyx ,but have the same performance?

hamsterHamster — Fri, 15 Oct 2021 19:53:35 GMT

It is likely that you need to resample the data for another rotation order. In short, what comes to mind, is to use HIK and define XYZ character, then have a characterized copy of the original character with ZYX order joints and use the former as a Source, then Bake skeleton.

If you plan to export it to FBX then there are some settings within the exporter which might reinterpolate those rotations from HIK Quaternion back to Euler.

Re: How to change the rotation order xyz to zyx ,but have the same performance?

Anonymous — Mon, 18 Oct 2021 05:08:21 GMT

thanks your reply; i fund a mel command [xform -p true -roo zxy;] to change the keyframe attribute; but i can't change rotate attribute in each frame.the rotate order attribute seems shared by all the bone animatin .only the select keyframe rotate changed.

Re: How to change the rotation order xyz to zyx ,but have the same performance?

hamsterHamster — Mon, 18 Oct 2021 16:09:43 GMT

The command is the right one. I just wrote expression that runs through the timeline, unfortunately it doesn't update keyframes. I asked into Maya Programming, waiting for response.

Re: How to change the rotation order xyz to zyx ,but have the same performance?

hamsterHamster — Tue, 19 Oct 2021 23:09:40 GMT

You see @Anonymous , wonders happen.

With that great help from @mcw0 the script works.

// resamples animation from one rotation order to another string $sel[] = `ls -sl` ; // save current rot order for every object in selection int $roos[] ; $i = 0 ; for ( $s in $sel ) { $roos[$i] = `getAttr ($s+".rotateOrder")` ; $i++ ; } // resample keyframes within the playback range $start = `playbackOptions -q -min` ; $end = `playbackOptions -q -max` ; print("Resampling range: "+ $start +" - "+ $end +"\n") ; $axis = { "x", "y", "z"} ; for ( $i = $start; $i <= $end; $i++ ) { currentTime -e $i ; for ( $j = 0; $j < size($sel); $j++ ) { select -r $sel[$j] ; setAttr ($sel[$j]+".rotateOrder") $roos[$j] ; xform -p true -roo zxy $sel[$j]; // HERE YOU SET DESIRED ROT ORDER for ($a in $axis){ $val = `getAttr ($sel[$j] +".r"+ $a)` ; setKeyframe -at (".r"+ $a) -v $val ; } } }

See entire discussion here.

And support the idea here.

Re: How to change the rotation order xyz to zyx ,but have the same performance?

mcw0 — Tue, 19 Oct 2021 23:27:48 GMT

I don't know. The original question was about maintaining "performance" and not "pose". Changing the rotation order changes the performance because the interpolation between keyframes will be different. The only solid solution is to bake the animation to the new rotation order.

Re: How to change the rotation order xyz to zyx ,but have the same performance?

hamsterHamster — Wed, 20 Oct 2021 00:00:38 GMT

My version of script does exactly that - it bakes every frame. Your example, as I understood, was a little different - it iterates through every existing keyframe.

At least, I resampled some xyz-mocaped rigs in my project and those look easier editable than before, even some gimbal locks seem to be gone, sufficient to offset just one shoulder curve to e.g. get rid of torso-arm penetration, whereas before I had to edit all three axis.

Re: How to change the rotation order xyz to zyx ,but have the same performance?

mcw0 — Wed, 20 Oct 2021 02:11:48 GMT

My bad. I didn't look that closely. That's what I get for sneaking stuff in while at work. LOL!!!

Re: How to change the rotation order xyz to zyx ,but have the same performance?

Anonymous — Thu, 28 Oct 2021 10:34:41 GMT

thanks for your script! it's solve my problem! Cheers.