pouët.net

Hi pouet, I'm doing some research on feedback effects. Got any pointers?

So far on my list:
ambience
atmta
moskwa
Ferner

White One by Never has it in a pretty pure form. Nothing but feedback.

aand I'm to dump to paste urls. This is the actual link to White One.

Spring Brought Us Dry Withered Flowers has a feedback effect that was inspired by Ferner :)

@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 :-)

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.

some of our scenes in http://godtv.satori.sk/ has some.

Ah stupid me. Forgot about Engine and Endo...

I think http://www.pouet.net/prod.php?which=53942 uses some feedback effects in various ways.

I think this one too.

Ah excellent pointers. I forgot how awesome Secret Rooms is.

The checkerboard / feedback effects in extatique are my favourites :) Need to dig through the rest of these though, I love feedback.

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.

oh wow: https://www.youtube.com/watch?v=WS8v6jKPP68

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 :)

pixtur: I believe that is a type of cellular automata.

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.

Planet risk (http://www.pouet.net/prod.php?which=13032 ) has some sort of feedback effect at around the 2:10 mark

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

Reaction diffusion is what I had in mind as well, quite a few examples on shadertoy: https://www.shadertoy.com/results?query=reaction

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?

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.