WorldViz User Forum - World Transformations

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- - World Transformations (https://forum.worldviz.com/showthread.php?t=3057)

c4am95

10-31-2010 02:08 PM

World Transformations

Hello. I'm using an HMD and intersense tracker. Code-wise, I use methods like "link.postTrans", etc. to apply virtual world transformations when using the HMD directly. However, I want to use the environment for testing as well, so I'm trying to find an easy way to apply world transformations without the tracker. It's surprisingly not as easy as I thought it would be. How could I, for example, rotate the entire world 180 degrees so that the camera is situated in the same position and now facing the other way, but the virtual subject it represents hasn't physically turned around?

Jeff	11-02-2010 12:32 PM

You can link the viewpoint to a mouse/keyboard tracker and apply a link operator to that:

Code:

import viz

viz.go()



gallery = viz.addChild('gallery.ive')



import viztracker

tracker = viztracker.KeyboardMouse6DOF()



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

link.postEuler([180,0,0])

Does this do what you want?

c4am95

11-07-2010 11:53 AM

this could work. but how do you change the properties of viztracker? for example, if i only want movement in x and z (no flying), how do i reduce the degrees of freedom?

Jeff	11-08-2010 09:10 AM

Does the following work for you?

Code:

import viz

import vizact



viz.go()



gallery = viz.addChild('gallery.ive')



import viztracker

tracker = viztracker.KeyboardMouse6DOF()



fixedTracker = viz.addGroup()



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

link.postEuler([180,0,0])



def updateView():

        x,y,z = tracker.getPosition()

        fixedTracker.setPosition(x,1.8,z)

        fixedTracker.setEuler(tracker.getEuler())



vizact.ontimer(0,updateView)

c4am95

11-09-2010 12:50 PM

yeah that works well. albeit, it made the eyeheight incredibly high for some reason. when i used instead:
fixedTracker.setPosition(x, 0, z)
it looked normal. bizarre?

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