problem with stereo mode

[shivanangel]

Hi again,

I'm having a problem getting into stereo mode.

I have two demo's. The first demo runs just fine.

The second demo involves manipulating the camera's location with a game pad. However, whenever I try to use viz.QUAD_BUFFER, I don't get stereo mode.

Here is my code:

##Name     :George D. Lecakes Jr
##Created  : October 11, 2006
##Modified : October 11, 2006
##Descr    : 	This program creates a viewport that centers around
##				the translational properties of an object similar
##				to that of a video game.
####################################################################

import viz

##############################################
##Game Pad Library Information
##############################################
import sid


viz.go(viz.QUAD_BUFFER)
viz.viewdist(-5)


##############################################
#Global Variables
##############################################

##Height from Interest

H = 0

##X from Interest

R = 0

##Z from Interest

I = 0


##############################################
##Reference Plane
##############################################

envio = viz.add('coords.obj')
envio.translate(0,-3,0)

##############################################
#Model of Interest
##############################################

modelOfInterest = viz.add('templateModel.obj')

##############################################
##Create a new viewpoint
##############################################

objectTracker = viz.add(viz.VIEWPOINT)

###############################################
##Get and set the main window to the viewpoint
###############################################

mainWindow = viz.get(viz.MAIN_WINDOW)
mainWindow.viewpoint(objectTracker)

###############################################
##Initialize Elements
###############################################

######################
##Object Of Interest
######################

interestx = 0 
interesty = 0
interestz = 0

modelOfInterest.translate(interestx,interesty,interestz)

######################
##Viewpoint
######################

viewCoordx = 0
viewCoordy = 10
viewCoordz = 20

objectTracker.translate(viewCoordx,viewCoordy,viewCoordz)

###############################################
#Function Declarations
###############################################
def georgesTimer(timerNum):
	
	## Get the translation information of the desired object
	
	#interest = modelOfInterest.get(viz.POSITION)
	
	## Get the translation information of the viewpoint
	
	#viewCoords = objectTracker.get(viz.POSITION)
	
	## See which gamepad button has been pressed
	
	global H
	global R
	global I
	
	global upCheck
	
	global interestx 
	global interesty
	global interestz
	
	global viewCoordx
	global viewCoordy
	global viewCoordz
	
	upCheck = 0
	
	## Up
	
	if sid.isbuttondown(7):
		
		diff = viewCoordy - interesty
				
		##  If view is above interest

		if  diff > 0:
			H = (H + .1)
			viewCoordy = (interesty + H)
			
		##  If View is below interet
	
		if diff < 0:
			H = (H + .1)
			viewCoordy = (interesty + H)
			
		## If View is equal to interest
	
		if diff == 0:
			viewCoordy = 0
			H = (H + .1)
			viewCoordy = (interesty + H)
						
## Down
	
	if sid.isbuttondown(8):
		
		diff = viewCoordy - interesty
	
		##  If view is above interest

		if  diff > 0:
			H = (H - .1)
			viewCoordy = (interesty + H)

		##  If View is below interest
		
		if diff < 0:
			H = (H - .1)
			viewCoordy = (interesty - abs(H))
		
		## If View is equal to interest
		
		if diff == 0: 
			viewCoordy = 0
			H = (H - .1)	
			viewCoordy = (interesty + H)
			

##Forward
	
	if sid.isbuttondown(3):
		
		diff = viewCoordx - interestx
	
		##  If view is above interest

		if  diff > 0:
			R = (R + .1)
			viewCoordx = (interestx + R)
			
		##  If View is below interet
	
		if diff < 0:
			R = (R + .1)
			viewCoordx = (interestx + R)
			
		## If View is equal to interest
	
		if diff == 0:
			viewCoordx = 0
			R = (R + .1)
			viewCoordx = (interestx + R)
			
##Backward	

	if sid.isbuttondown(2):
		
		diff = viewCoordx - interestx
	
		##  If view is above interest

		if  diff > 0:
			R = (R - .1)
			viewCoordx = (interestx + R)

		##  If View is below interest
		
		if diff < 0:
			R = (R - .1)
			viewCoordx = (interestx - abs(R))
		
		## If View is equal to interest
		
		if diff == 0: 
			viewCoordx = 0
			R = (R - .1)	
			viewCoordx = (interestx + R)

##Left
	
	if sid.isbuttondown(1):
		
		diff = viewCoordz - interestz
	
		##  If view is above interest

		if  diff > 0:
			I = (I + .1)
			viewCoordz = (interestz + I)
			
		##  If View is below interet
	
		if diff < 0:
			I = (I + .1)
			viewCoordz = (interestz + I)
			
		## If View is equal to interest
	
		if diff == 0:
			viewCoordz = 0
			I = (I + .1)
			viewCoordz = (interestz + I)
			
##Right	

	if sid.isbuttondown(4):
		
		diff = viewCoordz - interestz
	
		##  If view is above interest

		if  diff > 0:
			I = (I - .1)
			viewCoordz = (interestz + I)

		##  If View is below interest
		
		if diff < 0:
			I = (I - .1)
			viewCoordz = (interestz - abs(I))
		
		## If View is equal to interest
		
		if diff == 0: 
			viewCoordz = 0
			I = (I - .1)	
			viewCoordz = (interestz + I)



	objectTracker.translate(viewCoordx,viewCoordy,viewCoordz)
	objectTracker.lookat(modelOfInterest.get(viz.POSITION))
	print viewCoordx

###############################################
##CallBack to Functions
###############################################

viz.callback(viz.TIMER_EVENT, georgesTimer)
viz.starttimer(0,0, viz.PERPETUAL)

[farshizzo]

Are you able to get QUAD_BUFFER working with other scripts? QUAD_BUFFER stereo mode only works with specific graphics cards, like the nVidia Quadro. Do you have a capable graphics card?

[shivanangel]

Yes, we are able to get it working with ANY other script we have. As long as we don't start messing with the camera's coordinates directly through scripting things are fine.
But in the code I supplied as well as another camera rig I developed, it will not enter stereo mode. We are were unable to force the 'planets' demo into stereo mode and we were wondering if there might be a similar problem there as well.

~~George
Rowan University
VR Laboratory

[farshizzo]

Hi,

I tested out your script with Vizard 2.5 and experienced the same problem you described. I tried it out with Vizard 3.0 and it works fine. The problem is not caused by manipulating the viewpoint, but by adding a new viewpoint to the main window. In your script the workaround would be to replace the following code:

##############################################
##Create a new viewpoint
##############################################

objectTracker = viz.add(viz.VIEWPOINT)

###############################################
##Get and set the main window to the viewpoint
###############################################

mainWindow = viz.get(viz.MAIN_WINDOW)
mainWindow.viewpoint(objectTracker)

with:

##############################################
##Get the main viewpoint
##############################################

objectTracker = viz.get(viz.MAIN_VIEWPOINT)

###############################################
##Get the main window
###############################################

mainWindow = viz.get(viz.MAIN_WINDOW)