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From: Farhan Satria on 11 Jun 2010 22:30
Hi all..
I need some help in here. I'm trying to move 3d figure in matlab with my wiimote so it can roll and pitch. I'm using Wiilab (http://netscale.cse.nd.edu/twiki/bin/view/Edu/WiiMote). I success to move the 3d figure with a wiimote but it's not perfect. When wiimote's rolling 90 degree (or -90 degree) from starting position (wiimote at the table, pointing towards object at the screen), the object doesn't move as i expect. And it happens too if wiimote's pitch 90 degree (or -90 degree).
I put my script in here:

global wm;
addpath C:\'Program Files'\WiiLab\WiiLAB_Matlab\EG111-H
addpath C:\'Program Files'\WiiLab\WiiLAB_Matlab\WiimoteFunctions
[X,Y] = meshgrid([-2:.25:2]); // example
Z = X.*exp(-X.^2 -Y.^2); // of 3d
surf(X,Y,Z) // object
wm=Wiimote();
wm.DisconnectAllWiimotes();
wm.Connect();
view([0 1 0]);
axis vis3d;
camup('manual');
wm.GetAccelState();
X=wm.Accel.X;
Y=wm.Accel.Y;
Z=wm.Accel.Z;
sx=atan2(X,Z)*180/pi;
sy=atan2(Y,Z)*180/pi;
if wm.isConnected()
while ~wm.Buttons.A // press A to quit
wm.GetAccelState();
X=wm.Accel.X;
Y=wm.Accel.Y;
Z=wm.Accel.Z;
sx1=atan2(X,Z)*180/pi;
sy1=atan2(Y,Z)*180/pi;
dtheta=sx1-sx;
dphi=sy1-sy;
sx=sx1;
sy=sy1;
camorbit(dtheta,dphi,'data',[0 1 0]); // to perform roll and pitch
wm.GetButtonsState();
end;
end;
close all
-----------------------------------------------------------------------------------------------

i know the object act strange because i use atan2.. maybe it will act fine if i use euler's angle. but i don't know how. please someone help me fix my script. thanks..
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