Comments on: Papervision3D Sound Spectrum

By: Music visualizers in Flash using AS3 and computeSpectrum « Matt Eley | Labs

Mon, 31 Aug 2009 17:25:13 +0000

[...] up on this subject included this one by Grant Skinner, this one on Antti Kupila’s Blog and a Papervision3D version by John Lindquist. It’s also worth checking out the Adobe live docs for the SoundMixer Class as there is some [...]

By: Think Again » Blog Archive » pv3d.org AR contest submission one

Think Again » Blog Archive » pv3d.org AR contest submission one — Tue, 14 Apr 2009 04:45:56 +0000

[...] the visualizer thing is loosely based on johns sound analysis project http://pv3d.org/2008/12/06/papervision3d-sound-spectrum/ [...]

By: John Lindquist

John Lindquist — Thu, 11 Dec 2008 07:43:33 +0000

The camera.extra stuff was leftover from the original source before I updated it. So yeah, it’s not actually doing anything in this example.

But my answer still stands. “extra” is just an object where you can store properties to get later. It’s not necessarily good OOP practice to just have freely editable untyped objects like that floating around, but it comes in handy for quick demos.

By: Tunied

Tunied — Thu, 11 Dec 2008 07:36:20 +0000

Hi,
thanks for answer my qustion.but i still can’y understand what’s the extra

as far as i know

“extra” just like “goto” born in long time ago,sicen began to use oop(java、c++、as3…etc)
is not use anymore. did i right?

and i annotate the code just like this:

//camera.extra = {goPosition: DisplayObject3D.ZERO, goTarget: DisplayObject3D.ZERO};

the demo still run good.

so,what is
camera.extra = {goPosition: DisplayObject3D.ZERO, goTarget: DisplayObject3D.ZERO};
use for?

thanks a lot!

By: John Lindquist

John Lindquist — Wed, 10 Dec 2008 16:32:53 +0000

“extra” is just an object where you can store whatever you want.

By: Tunied

Tunied — Wed, 10 Dec 2008 13:15:13 +0000

Thanks the code

you know,it’s cool.

but i got a little confuse about this code

camera.extra = {goPosition: DisplayObject3D.ZERO, goTarget: DisplayObject3D.ZERO};

camera.extra whta’s that?