Wiley -
> I'm trying to prototype a sort of draggable star map in Quartz composer- it
> would be two layers of randomly scattered stars (each one a repeated .png).
One option would be to use the built-in Random Generator patch (or a Perlin
noise generator, for example), then pass it through some filters to give it a
more starfield-like appearance.
> While the particles are static, when you click and drag with the mouse, each
> layer would move at a different rate, creating parallax motion.
This can be pretty easily achieved using the Sample & Hold patch --- take a
sample of the mouse position when the mouse button is pressed, then subtract
that starting position from the current mouse position, and you get the delta.
Use another Sample & Hold to maintain the position once the mouse button is
released.
I've posted an example here:
http://kineme.net/composition/smokris/StarfieldParallax
Steve _______________________________________________
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