koobas.hobune.stream
Gimbal Lock fix
hey !
I come here cause I have a question about gimbal lock and you guys seems to talk a lot about it. But i'm not on unity but it doesn't change much
I've recently got a kinect, I pluged it into my pure data so I get XYZ translations of the points that mal my skeleton.
what I want is to convert it into angles.
So I made a simple algo with trigonometry wich gives me in degree from à to 360 in X Y Z rotation of my left arm. Now when I apply it to a cube it's kind of weird. After looking a while online I found about the Gimbal Lock, so I adapted a fix in C to PureData.
The result is still buggy so I guess I did something wront.
Could someone tell me what following rotations he get after gimbal fix for
X 160 Y 90 Z 267
with Y to be the base
I get
X 0 Y 90 Z 106
I attached my PD patch in case of
[1]: http://answers.unity3d.com/storage/temp/1291-gimblekill.pd.txt
Unity3d should take care of this, or someone should, seeing as it is a complex matrix that makes 100ds of developers ask questions and make code faliures
there should be an XYZ "wrapper" for unity that simply applies proper maya type rotation maths to a gameobject, i.e. it resets order of xyz axis rotation when 2 axes are close to a lock alignment.
I'm quite new here so my answer might not be useful, but a bad answer is better than no answer I guess.
Try quarternions. I don't really know how they work yet but you can use them in place of angles to avoid gimbal lock (which I also don't really understand yet)
http://unity3d.com/support/documentation/ScriptReference/Quaternion.html
http://en.wikipedia.org/wiki/Quaternion
I hope this helps!
Hey !
yeah it's what I'm already doing :)
and that's my question, is my quaternion transformation right.
In the meantime I found out that non when I compare my results to others on a calculator (euler/quaternion).
The part wich is wrong is calculation of RX in case of gimbal lock
this part :
RX = ((sin_X*sin_Y)*sin_Z)+(cos_X*cos_Z);
RY = (-(sin_X*sin_Y)*cos_Z)+(cos_X*sin_Z);
Z = Math.atan2(RY,RX);
Z *= RADIANS;
if anyone can correct me would be great
thanks
