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Random frame on trigger
Hello,
I am working on an animation in which I would like to trigger a random frame in a frame sequence based on an audio event (an irregularly timed click). The frame would hold until the next trigger.
I can very easily create a boolean switch from the audio using soundkeys or an expression. I am having a more difficult time figuring out how I would use this to trigger a random frame which would hold until the next trigger.
I would appreciate it if someone could point me in the right direction.
Best,
– Justin
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Design, Animation, Editing, Color for Cinema, Broadcast, Web and Installation.Gear: 2 X Macpro 8 Core Nehalem, ATTO R380, Proavio EB8MS, nVidia GTX-286, Blackmagic Decklink Studio, AJA LHi, FSI LM-2461W, Tangent Wave, Yamaha HS50Ms W HS10w Sub
Tools: Avid MC 5.5 (formerly FCP), CS 5.5, C4D13, Resolve 8.1, VDMX, Quartz Composer, Processing, Cubase 5.
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2 Replies
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I think you first need to count how many triggers there have been up to the current time. This should help with that:
https://www.motionscript.com/design-guide/audio-count.html
Then use the resulting value (n) to seed the random number generator:
seedRandom(n,true);
Then select the random frame:
framesToTime(Math.floor(random(number_of_total_frames)))
Something like that.
Dan
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Perfect! Thank-you, Dan. I also used the counter to create random seeds for some fractal noise layers that I am using for textures and light.
The end effect is that each time the bass drum is hit, a new background appears.
Best,
– Justin
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Design, Animation, Editing, Color for Cinema, Broadcast, Web and Installation.Gear: 2 X Macpro 8 Core Nehalem, ATTO R380, Proavio EB8MS, nVidia GTX-286, Blackmagic Decklink Studio, AJA LHi, FSI LM-2461W, Tangent Wave, Yamaha HS50Ms W HS10w Sub
Tools: Avid MC 5.5 (formerly FCP), CS 5.5, C4D13, Resolve 8.1, VDMX, Quartz Composer, Processing, Cubase 5.
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