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Old 10-14-2016, 12:15 PM
willpower2727 willpower2727 is offline
Join Date: Feb 2015
Posts: 39
Cool Interpolated scaling or force?

I'm trying to visually enhance an explosion (mesh bomb from 3ds converted to osgb) with the fire.osg. I want to make the fire osg expand rapidly but not instantaneously. I can re-scale it but the change is too abrupt. I have tried applying a force but it only moves the whole object in one specified direction. I'd like it to sort of blow up in all directions. Any ideas? Here's what I've tried so far:

import viz
import vizact

fire = viz.addChild('fire.OSG',scale=[2,2,2])

firep = fire.collideSphere()

def rescale():

def explode():
print('apply force')
fire.applyForce( dir=[100,0,0],duration=5)
# fire.setScale([4,4,4])


vizact.onkeydown(' ',rescale)
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Old 10-17-2016, 05:22 PM
Jeff Jeff is offline
WorldViz Team Member
Join Date: Aug 2008
Posts: 2,471
Open the file in Vizard so you can edit the text and search for 'initialSpeedRange'. The two values shown set the min and max range of the particles initial speed. Try increasing those values and see if it helps.
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Old 10-18-2016, 10:07 AM
willpower2727 willpower2727 is offline
Join Date: Feb 2015
Posts: 39
Brilliant! Thanks Jeff, I was able to play around with some of the other parameters as well and it looks awesome.
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explosion, fire, osg, osgb, physics

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