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Overview

You can use the Wiimote(Plus) and the nunchuck for controlling the viewer. Using a wiimote, one has a powerful freehand 3d-controller which has all the options to navigate freely when in a presentation situation. The software used is cwiid. Cwiid lets you control the accelerometer, the ir-camera, and every button on the wiimote and nunchuck through the use of config-files. The hardware used: 1 Wiimote(~40 euro), 1 nunchuck(~20 euro), 1 wireless wiibar(~15 euro), and a bluetooth dongle(~10 euro).

Procedure

• Install the bluez libraries
• Run the bluetooth daemon
• Download and compile cwiid from git

git clone https://github.com/abstrakraft/cwiid.git
cd ./cwiid
atlocal
autoconf
vi /etc/ld.so.conf
( add a line "include /usr/local/lib")
ldconfig
./configure 
make
make install

Or you can directory download wminput and wmgui via apt-get or so.

• Make a new configuration file for wminput, and fill with the wiimote-only or wiimote-nunchuck(prefered) setup

vi /usr/local/etc/cwiid/wminput/opensim

Wiimote-Only

There are basically 4 essential keys that the viewer uses, but the wiimote interface is not really suited to control 4 buttons within the hand's normal reach. So - lets have a look at that configfile again - you can see that the right mouse-button is out of alignment with your normal handposition on the wiimote. You normally won't use that button(option menu) as often as the other onces. The buttons within reach are all configured to control the way you position the camera. A-Button is mouse leftclick(select object, select pivot-point), The B-Button is yaw, and digital-down is pitch.

#ir_ptr
include buttons
 
Plugin.ir_ptr.X	= ~ABS_X
Plugin.ir_ptr.Y	= ~ABS_Y
Wiimote.A	= BTN_LEFT
Wiimote.Plus	= BTN_RIGHT
Wiimote.B	= KEY_LEFTALT
Wiimote.Down	= KEY_LEFTCTRL

Wiimote-Nunchuck

With a nunchuck we can relieve the moving-controls to the analogue controller. Also, the down-button linked to left-ctrl is somewhat a hack. It works, but it's not the most natural approach possible. The wiimote-nunchuck configuration:

include buttons
 
Plugin.ir_ptr.X = ~ABS_X
Plugin.ir_ptr.Y = ~ABS_Y
Wiimote.A       = BTN_LEFT
Wiimote.B       = KEY_LEFTALT
Nunchuk.C       = KEY_LEFTSHIFT
Nunchuk.Z       = KEY_LEFTCTRL
 
Wiimote.Up      = KEY_PAGEUP
Wiimote.Down    = KEY_PAGEDOWN
Wiimote.Left    = KEY_LEFT
Wiimote.Right   = KEY_RIGHT
Wiimote.Plus    = BTN_RIGHT
Wiimote.Minus   = KEY_B
Wiimote.Home    =KEY_M
#Wiimote.1      = KEY_PROG1
#Wiimote.2      = KEY_PROG2
Plugin.nunchuk_stick2btn.Up     = KEY_UP
Plugin.nunchuk_stick2btn.Down   = KEY_DOWN
Plugin.nunchuk_stick2btn.Left   = KEY_LEFT
Plugin.nunchuk_stick2btn.Right  = KEY_RIGHT

Notice the Plugin.nunchuck_stick2btn, which is only in the svn-version of cwiid.

• Load the uinput kernel module

modprobe uinput

• Start wminput with the opensim config

wminput -c opensim