The animation value of an object (or an effect) at each frame, is the sum of the parameter value, (generated from the keyframe animation table), and the sound value at that frame.
animVal = paraVal + soundVal.
This tutorial is about the basics of using soundVal to vary animVal. So I will keep paraVal constant and use only sound data to direct the animation of parameters.
A cool thing about using only soundVal (no keyframe animation) is that we can set up a trial with just two keyframes (beginning and end).
Note. You can create an audio file for the single purpose of directing the animation of a parameter. This audio file is not used at all in the final song mix. You can also use Anim by Sound to create silent videos.
Keyframe animation requires changes to be made at keyframes. It is possible with Sound animation to make changes at any frame, (i.e. a change at any 1 / 30 of a second time interval, when at 30fps.)
The current version is proof of concept . At present there is a smooth filter and a decay filter, and only one basic conditional filter, but the enhancement are unlimited. A conditional filter can trigger an event that can last for as many frames as required. In theory a triggered event can be coded to do "whatever" over a length of frame_time.
If we assume that an event less than 7 frames long, can be difficult to observe at 30fps, then in Pitch mode the notes have to spaced to allows for this, or increase/decrease in a flowing manner. If the pitch is rapidly alternating up and down then we get the jiggling movement. Similarly with amplitude, so I would make a kick drum trigger an event of duration 7 frames to ensure it is observable.
The ideal situation is where the music is written for the fractal animation. (120bpm at 4/4 is ideal to sync keyframe animation with audio animation).
It still early days, there are various known enhancements to evaluate. And testing can be time consuming without a render farm.
November 27, 2009, 01:13:01 AM
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