WorldViz User Forum - Create Two sequential tasks for images in Vizard

WorldViz User Forum (https://forum.worldviz.com/index.php)

- Vizard (https://forum.worldviz.com/forumdisplay.php?f=17)

- - Create Two sequential tasks for images in Vizard (https://forum.worldviz.com/showthread.php?t=6368)

Create Two sequential tasks for images in Vizard

I'm new in Vizard. I'm trying to create a simple code to perform two tasks sequentially for a specific time set:

A black image for 0.8 seconds
A sequence of images (from a folder) taken randomly, for 1.5 seconds. I can perform these task separately, but I can't merge together. Suggestions are very appreciated, thank you

Code:

import viz

import vizact

import vizinfo

import random





viz.setMultiSample(4)

viz.fov(60)

viz.go()



vizinfo.InfoPanel()

viz.clearcolor(viz.BLACK)



FRAME_RATE  = 0.667       # in Hertz



r = list(range(7))

random.shuffle(r)

movieImages = viz.cycle( [ viz.addTexture('sequence_IMG/img%d.jpg' % i) for i in r ] )

screen = viz.addTexQuad()

screen.setPosition([0, 1.82, 1.5])

screen.setScale([4.0/3, 1, 1])



def executeExperiment():

    for trialNumber in range(3):

        yield Dark() #wait for doTrial to finish

        yield vizact.ontimer(1.0/FRAME_RATE, NextMovieFrame)

        print('Trial Done: ', trialNumber)



    print('done with experiment')



#Setup timer to swap texture at specified frame rate

def NextMovieFrame():

    screen.texture(movieImages.next())

    

def Dark():

    yield viztask.waitTime(1) #wait for 1 second

    viz.clearcolor(viz.BLACK)

    

vizact.ontimer(1.0/FRAME_RATE, NextMovieFrame)

viztask.schedule(executeExperiment())

Use viztask.waitTime instead of vizact.ontimer to wait inside of a task function. It seems like you can place the sequential actions in a single task function:

Code:

blankTexture = viz.addBlankTexture(size=(100,100))



def executeExperiment():

    for trialNumber in range(3):

        # Show blank texture for one second

        screen.texture(blankTexture)

        yield viztask.waitTime(1)



        # Show movie texture for 1.5 seconds

        screen.texture(movieImages.next())

        yield viztask.waitTime(1.5)



        print('Trial Done: ', trialNumber)

    print('done with experiment')

Display random images from a folder

Thank you so much!
It is also possible to display the image from a folder randomly without rename all the images in the folder?
an alternative solution for this 3 lines

Code:

r = list(range(7))

random.shuffle(r)

movieImages = viz.cycle( [ viz.addTexture('sequence_IMG/img%d.jpg' % i) for i in r ] )

:confused::)