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Jitter Fractals

june 2010
France

The image creation relies on a video feedback loop with rotation, zooming, position displacement and contrast/luminosity/saturation modifications. The input is the in-built webcam of the computer.

Lately, I modified the software to switch from CPU to GPU processing which really works faster and smoother, but I don’t get the same colors and textures…
I’ll try to find time to make another video.

How was MAX used?

The objects used in the CPU version are jit.op @op avg, jit.xfade, jit.rota, jit.brcosa, with matrix feedback.

DISCUSSION

8 Comments

Lars says:

Looks amazing – is there a patch you can share?

Bertrand Fraysse says:

I prefer to share the idea more than an already made patch.
It’s very simple technically.

I don’t want to point people to one direction using feedback technique.
If you really don’t find a way to create a video feedback loop, I could share a way to do it…

Thanks for your attention and replay by the way.

William Graham says:

very filthy

freepoulite says:

nice!

Yarhkob says:

Hey awesome patch, do you mind explaining how this matrix feedback works?

Bertrand Fraysse says:

to create a feedback loop in jitter, there’s a little trick, like in msp you need [send~] and [receive~]
I just opened my CPU version and without doubt it’s way better (but way slower too)

so for the feedback loop you need [jit.xfade @in2_name x @out-name x].
the xfade message will control the feedback amount.

you connect your video input to [jit.xfade] in1 then its output to the video processing (in this situation [jit.rota @boundmode 4] and [jit.brcosa]) and the processing output back to [jit.xfade] in2.
a [jit.brcosa] on the output is useful to bring back the luminosity/contrast the feedback loop removes.
voilà.

if you don’t get it, don’t hesitate to ask questions, if you find any nice results, show us.
have fun.

Clayton says:

I just started using Max/Jitter and this has to be the coolest thing I’ve seen so far come from it. I just hope my projects turn out to be this sweet.

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