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  #1  
Old 02-26-2018, 09:49 AM
performlabrit performlabrit is offline
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Join Date: Oct 2013
Posts: 74
Vive: trouble setting node as a child of the head

Hello folks,

I'm trying to do a routine operation with the vive, and am having trouble. I would like to set a node (a vizshape sphere) in front of the head eye. One approach is to child the node to the mainview, or the head tracker. However, neither approach seems to work!

For example, if you use the standard vizconnect VIVE config and add the following code to main:

HTML Code:
import vizshape
ht = vizconnect.getRawTracker('head_tracker')
r = vizshape.addSphere(0.05, color = viz.RED)
r.setParent(ht)
r.setPosition([0,0,1]) # Doesn't work for any forward direction (e.g. [1,0,0])
It also doesn't work if I child it to the mainview.
Am I missing something?

Also, in the code above, note that the assumption is that the head is facing down Z in the model's local coordinate system. I'm not sure that this assumption is true (although, no other directions work either). What direction is "forward" and what direction "up" for the Vive?

Last edited by performlabrit; 02-26-2018 at 09:58 AM.
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  #2  
Old 02-26-2018, 08:55 PM
Jeff Jeff is offline
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Join Date: Aug 2008
Posts: 2,378
Try using the <node3d>.setReferenceFrame command. Does this work for you?
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  #3  
Old 02-28-2018, 06:34 AM
performlabrit performlabrit is offline
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Join Date: Oct 2013
Posts: 74
Success with <node>.setReferenceFrame()

Thanks jeff! The following code worked...
HTML Code:
	import vizshape
	r = vizshape.addSphere(0.05, color = viz.RED)
	r.setReferenceFrame(viz.RF_VIEW)
	r.setPosition([0,0,1])
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  #4  
Old 03-01-2018, 08:41 AM
performlabrit performlabrit is offline
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Join Date: Oct 2013
Posts: 74
Problems continue. What's going on?

Sadly, my attempts to place a sphere along the gaze vector are still not behaving as expected. None of the parenting functions work, and viz.setRefrenceFrame is producing unpredictable results.

Here are two new attempts dropped into my vizconfig main function that uses the standard VIVE template. Neither work. Any advice from the peanut gallery?
HTML Code:
############# Attempt 1, what I thought would work...

	import vizshape
	
	IPD = viz.MainWindow.getIPD()

# It does seem that the right eye base is in the correct position and updates with head position
	rightEyeBase = vizshape.addSphere(0.05, color = viz.BLUE)
	rightEyeBase.setReferenceFrame(viz.RF_VIEW)
	rightEyeBase.setPosition([IPD/2,0,0])
	rightEyeBase.alpha(0.00)

link = viz.link(viz.MainView,rightEyeBase,viz.PRIORITY_SCENEGRAPH) # I tried with and without the link here
	link.setMask(viz.LINK_ORI)

	rightGazePoint = vizshape.addSphere(0.05, color = viz.YELLOW)
rightGazePoint.setReferenceFrame(rightEyeBase)
	
	smi = viz.add('smi_vive.dle')
	eyeTracker = smi.addEyeTracker()

	def updateGazeNode(vecLength = 3.0):
		
rDir = eyeTracker.getRightGazeDirection() 
rightGazePoint.setPosition(rDir[0]*vecLength,rDir[1]*vecLength,rDir[2]*vecLength)   
		
	vizact.onupdate(viz.PRIORITY_LAST_UPDATE,updateGazeNode)

###########



############# Attempt 2, based on the example provided by Worldviz (smiViveExample.py)
## Note that this doesn't accoutn for the right eye offset.

	import vizshape
	
	IPD = viz.MainWindow.getIPD()
	rightEyeBase = vizshape.addSphere(0.05, color = viz.BLUE)
	rightEyeBase.setReferenceFrame(viz.RF_VIEW)
	rightEyeBase.setPosition([IPD/2,0,0])
	rightEyeBase.alpha(0.00)

	rightGazePoint = vizshape.addSphere(0.05, color = viz.YELLOW)
	#rightGazePoint.setReferenceFrame(rightEyeBase)
	
	
	smi = viz.add('smi_vive.dle')
	eyeTracker = smi.addEyeTracker()

	def updateGazeNode(vecLength = 3.0):
		
		gazeMat = eyeTracker.getMatrix()
		gazeMat.postMult(viz.MainView.getMatrix())
		rightGazePoint.setMatrix(gazeMat)
		
	vizact.onupdate(viz.PRIORITY_LAST_UPDATE,updateGazeNode)
###########
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