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Demos with feedback effects

category: gfx [glöplog]
Hi pouet, I'm doing some research on feedback effects. Got any pointers?

So far on my list:
ambience
atmta
moskwa
Ferner
added on the 2016-01-18 11:26:40 by pixtur pixtur
White One by Never has it in a pretty pure form. Nothing but feedback.
added on the 2016-01-18 11:29:38 by urs urs
aand I'm to dump to paste urls. This is the actual link to White One.
added on the 2016-01-18 11:30:31 by urs urs
Spring Brought Us Dry Withered Flowers has a feedback effect that was inspired by Ferner :)
added on the 2016-01-18 11:32:15 by Preacher Preacher
@preacher oh, i did miss that. Quite beautiful
@urs: Now I remember watching it at TUM. I think it was the primary inspiration for Ferner :-)
added on the 2016-01-18 11:45:59 by pixtur pixtur
Engine and Endo are largely based around feedback. From DOS front off the top of my head worthy mentions include x14, Kromiset Sienet and From My Heart.
added on the 2016-01-18 12:13:01 by noby noby
added on the 2016-01-18 12:24:13 by rudi rudi
some of our scenes in http://godtv.satori.sk/ has some.
Ah stupid me. Forgot about Engine and Endo...
added on the 2016-01-18 12:43:21 by pixtur pixtur
I think http://www.pouet.net/prod.php?which=53942 uses some feedback effects in various ways.
added on the 2016-01-18 14:08:52 by Optimus Optimus
I think this one too.
added on the 2016-01-18 14:11:02 by Optimus Optimus
Ah excellent pointers. I forgot how awesome Secret Rooms is.
added on the 2016-01-18 14:21:39 by pixtur pixtur
The checkerboard / feedback effects in extatique are my favourites :) Need to dig through the rest of these though, I love feedback.
added on the 2016-01-18 14:26:09 by psonice psonice
Does anyone know the correct explanation for these kind of labyrinth structures?
https://youtu.be/B4Kn3djJMCE?t=5m15s

I can recreate them (sometimes) through applying edge-detection. But it's too unreliable.
added on the 2016-01-18 14:32:38 by pixtur pixtur
oh wow: https://www.youtube.com/watch?v=WS8v6jKPP68
added on the 2016-01-18 14:39:09 by pixtur pixtur
pixtur: i don't think edge detection is the best way to reach that, it seems like you have normal starting noise, then just start tilting the rotation of the feedback buffer to a specific angle, the rotation angles of the feedback end up getting lined up creating a spyral. if you manage to form a pattern that is polarly simetrical (or whatever you call that, don't know the exact term) it sustains itself in the feedback. so it's just a matter of finding the right tilt angle to do proper pattern build up and sustain it. if you're using sin/cos to do the rotation you might want to stop it once you reach the rotation that's causing your pattern to emerge, or modulate it to make it really really slow, i remember doing something similar with an analogue videocam pointing at a tv screen, didn't require insane rotations, just holding it steady when the pattern is emerging :)
added on the 2016-01-18 15:07:46 by psenough psenough
pixtur: I believe that is a type of cellular automata.
added on the 2016-01-18 15:07:51 by drift drift
Not sure about the cellular automata. My gut tells me that it's more related to blurring the image (the width of the walls/gaps being the blur-kernel). With analog equipment this could be the inherent defocused or imprecise optics.

unc seems to to have mastered it in Chipyxa.
added on the 2016-01-18 15:17:36 by pixtur pixtur
Planet risk (http://www.pouet.net/prod.php?which=13032 ) has some sort of feedback effect at around the 2:10 mark
added on the 2016-01-18 15:18:23 by Navis Navis
Actually I may be confused with the names, I know I have seen these patterns generated algorithmically before. Reaction Diffusions systems seem to make similar patterns.

https://www.youtube.com/watch?v=8dTmUr5qKvI
added on the 2016-01-18 15:18:57 by drift drift
Reaction diffusion is what I had in mind as well, quite a few examples on shadertoy: https://www.shadertoy.com/results?query=reaction
added on the 2016-01-18 15:38:58 by noby noby
What is "feedback"? Anything that uses previous frames in an additive formula? Then you can count any demo that has effects like
- fire
- motion blur
- blitter "fractal" zoomer
- water simulation

Can you name a demo that does not contain feedback?
added on the 2016-01-18 17:18:18 by yzi yzi
Point well taken. I'm probably looking for examples that don't use feedback to fake something else but explore its interesting property of generating patterns and motion.
added on the 2016-01-18 17:57:35 by pixtur pixtur

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