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Author Topic:   random triggers in Timeline
Bill Meadows
Member 		posted 21 March 2008 21:26         Edit/Delete Message   Reply w/Quote
I am using this construct:

1 randomTrigger: 0.5s

in a Sound and it works fine.

When I put the Sound in a Timeline, it works until the cursor gets to a "WaitUntil" Sound.

How can I create random triggers in a Timeline while it is stopped at a "WaitUntil" Sound?

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SSC
Administrator 		posted 22 March 2008 12:22         Edit/Delete Message   Reply w/Quote
The randomTrigger: expression relies on !LocalTime which stops at a WaitUntil. Instead, you could use an expression that relies on !RealTime. For now, you could paste this code into the Gate or Trigger parameter field of your Sound:
code:

	| cumDur uniformRand  averageDur deltaDur |
	averageDur := 0.5 s.
	deltaDur := 0.5 * 0.5 s.
	
	cumDur := EventVariable new.
	cumDur initialValue: 0.
	
	uniformRand := ((((!Random * (deltaDur s removeUnits)) + (averageDur s removeUnits)) vmax: 0.002) vmin: (2 * averageDur s removeUnits)).
	
	^ (1
		true: ((!RealTime ge: cumDur)
				true: (
					((cumDur eq: 0)
						true: (cumDur <+ !RealTime) false: (nil)),
					(cumDur <+ (cumDur + uniformRand)),
					1)
				false: (0))
		false: ((cumDur <~ 0)))

I'll change the internal implementation of randomTrigger to use !RealTime so you won't have to use this verbose way of doing it in the future.

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Bill Meadows
Member 		posted 22 March 2008 18:51         Edit/Delete Message   Reply w/Quote
That works - thanks.


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