WorldViz User Forum - Updating a Postprocessing effect

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- - Updating a Postprocessing effect (https://forum.worldviz.com/showthread.php?t=5343)

Updating a Postprocessing effect

I'd like to be able to modify and update a postprocessing effect in a loop for a particular effect. Specifically, I'm wanting to modify BulgeAmount such that it loops and interpolates between -0.5 and 0.5:

Code:

effect = BulgeEffect(BulgeAmount)

vizfx.postprocess.addEffect(effect)

I tried using the director function to create a new thread and have it loop separately from the main thread but it crashed. This is the code I tried:

Code:

import viz

import viztask



import vizfx.postprocess

from vizfx.postprocess.distort import PincushionEffect



def UpdateDrunkEffect():

        DrunkValue = 0

        Modulate = True

        

        Length = 60

        

        while True:

                if DrunkValue <= 0:

                        Modulate = True

                                

                if DrunkValue >= 1:

                        Modulate = False

                        Length -= 1

                                

                if Modulate:

                        DrunkValue += .01

                else:

                        DrunkValue -= .01

        

                effect = PincushionEffect(DrunkValue)

                vizfx.postprocess.addEffect(effect)

                

                if Length == 0:

                        effect = PincushionEffect(0)

                        vizfx.postprocess.addEffect(effect)

                        break

                

viz.director( UpdateDrunkEffect )

Is there a better way to do this that I'm just not thinking of? How can I go about changing the postprocessing effect in a loop without it freezing the application?

Here's an example that uses the viztask.waitCall command to call effect.setBulge and waits until the vizact.mix parameters are complete.

Code:

import viz

import vizact

import viztask



viz.go()

viz.addChild('gallery.osgb')



import vizfx.postprocess

from vizfx.postprocess.distort import BulgeEffect

effect = BulgeEffect(0,radius=1)

vizfx.postprocess.addEffect(effect)



def BulgeTask():

        

        increase = vizact.mix(-0.5,0.5,time=2)

        decrease = vizact.mix(0.5,-0.5,time=2)



        while True:



                yield viztask.waitCall(effect.setBulge,increase)

                yield viztask.waitCall(effect.setBulge,decrease)



viztask.schedule( BulgeTask() )

Thank you Jeff! This is exactly what I was trying to do. You make my life easy.