room tilting when moving head up and down with HMD Nvis SX111

[karinp]

OK I solved it, now works perfectly...here is how for anyone else might need it in future...

import viz
import random
import vizact
import viztask
import glob
import viztracker
import nvis

viz.setMultiSample(4)
viz.fov(60)
viz.setDisplayMode(2560, 1024)
viz.go(viz.QUAD_BUFFER| viz.FULLSCREEN)
nvis.nvisorSX111()

vrpn = viz.add('vrpn7.dle')
headTrkr = vrpn.addTracker("head2@10.0.0.1")

###Negate Z value of position
headTrkr.swapPos([-1,3,-2])

###Negate X,Y value of quaternion
headTrkr.swapQuat([1,-3,2,4])

link = viz.link(headTrkr,viz.MainView)

link.preEuler([-45, 0, 0])

print headTrkr.getEuler()
print viz.MainView.getEuler()
print viz.MainView.getAxisAngle()
print headTrkr.getAxisAngle()