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Converting rotation orders – X>Y>Z to Y>X>Z
This is a follow up to this thread…
https://forums.creativecow.net/thread/227/17971
… I thought I’d start a new one as I’ve managed to isolate the problem to a rotation order issue.Basically I am looking for a function that could convert the rotation order of X>Y>Z to Y>X>Z.
I tried to workaround this be creating a parented structure to force a Y>X>Z order but unfortunately this caused massive problems with other parts of the composition.
I have been struggling through this problem for ages and I am close to losing my mind. If anyone could help I would be so grateful, especially as I am beginning to get quite a bit of pressure from the client now.
I guess I am looking for an expression that looks something like this:
//
camL = thisComp.layer(“Camera 1”);x1 = camL.xRotation;
y1 = camL.yRotation;
z1 = camL.zRotation;rot1 = [x1, y1, z1];
convertXYZtoYXZ(rot1);
function convertXYZtoYXZ(r1) {
// clever maths code here
return([pan, tilt, roll]);
}
//Many thanks,
JamieJimJam•Graphics
https://www.jimjamgraphics.com/ -
4 Replies
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It’s definitely possible, but I think it’s going to involve some pretty complex math. I think you’re going to need a rotation matrix to unroll the x,y,z rotation and then another to roll it in y,x,z order. Even if you’re familiar with matrix math, it’s probably going to take quite a bit of work to get it right.
Dan
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Cheers Dan.
I suspected that it might be something along those lines. I’ve found this documentation:
https://www.geometrictools.com/Documentation/EulerAngles.pdf…and I’m hoping I can work out what’s needed from there. Wish me luck!
Jamie
JimJam•Graphics
https://www.jimjamgraphics.com/ -
That looks like a very nice resource. I think you just need to rotate -z,-y,-x,y,x,z. You need to make sure that the “handedness” of the rotation matrices matches AE, which I think is a right-handed coordinate system. The devil is in the details though. Please report back if you crack it or get stuck somewhere.
Dan
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hi Jamie
I’d be very keen to hear if you crack the problem
I’m struggling with something similar.
I want to convert the orientation values of an AE camera back into traditional “pan & tilt” values.cheers../Daniel
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