[PD] pd thunder

[Andy Farnell]

You're spot on there. I will develop the stereo image as I work on
the environment model.

But interestingly enough, lightning _is_ an explosion, one hell of
a big explosion. The plasma is as hot as the Sun for an instant and
that's why the air expands, the energy in a lightning bold makes most
bombs seem like little fireworks. The difference is, and this is
unusual, it radiates in a cylinder not a sphere, and sound comes
from a simultanoeus extent (because the bolt moves at the speed of
electricity which is closer to the speed of light than the speed of
sound)

What I have is still a bit too much like Scooby Doo Castle thunder.
Having once been caught in a storm with bolts hitting a few hundred
meters from me I know from experience it sounds nothing like that,
it's a very difficult sound to capture synthetically.

The way I'm trying now is a kind of physical model, taking into account
thousands of tiny wavelets called N-waves that each come from a kink
in the lightning bolt - strangely (because of interference patterns
that cancel out) the shape of the lighning bolt has a direct correlation
to the sound.

cheers,
a.




On Tue, 5 Feb 2008 13:29:11 +0900
"hard off" <hard.off at gmail.com> wrote:

> just a suggestion:
> 
> i think the reason why they sound a bit like explosions, rather than
> thunder, is because the cracks of thunder are propogated directly in
> front of you.  maybe some sort of spatialization could make the crack
> appear more overhead, and then the rumble lower down?


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