A Simple "Hello World" In Stereo

In this demo, we use PsychoPy to generate a stereoscopic display. The word “Hello” is presented to one eye, and the word “World” is presented to the other. The demo uses frame-sequential stereo and Stereo Blue Lines to assign each frame to the left and right eye.

This demo uses the 3DPixx active shutter glasses and the VIEWPixx /3D. The code can easily be modified for a PROPixx and 3D Polarizer.

If you are new to 3D stimulus presentation using the PROPixx or VIEWPixx /3D, we recommend reading the following introductory guides:

3D Projection with the PROPixx and 3D Polarizer

3D Stimulus Presentation with the VIEWPixx /3D

PY

from psychopy import core, visual
from psychopy.hardware import keyboard
from pypixxlib.viewpixx import VIEWPixx3D
from pypixxlib._libdpx import DPxEnableVidLcd3D60Hz, DPxSetVidVesaPhase, DPxIsVidVesaBlueline

def initializeVPx3D():
    #All VPixx hardware commands to set the right mode for the VIEWPixx 3D
    my_device = VIEWPixx3D()
    my_device.setVideoMode('C24')
    my_device.setVideoVesaBlueline(True)
    my_device.setVesaWaveform('NVIDIA') #or VOLFONI
    DPxSetVidVesaPhase(100)
    DPxEnableVidLcd3D60Hz()
    my_device.updateRegisterCache()
    
    return my_device

def drawBlueLine(win, frame=0):
    #Helper function to draw lines on the appropriate image
    #if Frame = 0, draw left eye blueline
    #if Frame = 1 draw right eye no blueline
    #Call immediately before flip
    if frame==0: 
        frameColor = [0,0,255]
    else:
        frameColor = [0,0,0]

    rowStart= [-win.size[0]/2, win.size[1]/2]
    rowEnd =[win.size[0]/2, win.size[1]/2]
        
    line = visual.Line(
            win=win,
            units = 'pix',
            start=rowStart,
            end=rowEnd,
            interpolate = False, #MUST be set to false
            colorSpace = 'rgb255',
            lineColor = frameColor)
    line.draw()
    
#Begin Experiment
kb = keyboard.Keyboard()
VPx = initializeVPx3D()
win = visual.Window(
        screen = 1,
        monitor =None, 
        fullscr=True,
        color='black',
        units = "pix"
        )
#Initialize our stimuli
hello = visual.TextStim(win=win, text='Hello')
world = visual.TextStim(win=win, text='World')

#Start a loop drawing our message
while True:
    hello.draw()
    drawBlueLine(win, frame=0)
    win.flip()

    world.draw()
    drawBlueLine(win, frame=1)
    win.flip()

    keys = kb.getKeys(keyList=['escape'])
    if keys:
        break
    
win.close()
core.quit()