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slit scan ++ or any other pixel sorting way?


  • Beta Tester

    Hi , I 'm a big fan of slit scan actor, would you know any other shaders or ffgl allowing to modify some more parameters like speed, size of slices, etc.? 

    I remember one of that style with x y parameters but it was just real time slices of pixel color, not recording as this one...

    thanks a lot.


  • Beta Tester

    Hi little up, I scrolled  my entire GLSL shaders and iSF converted library but couldn't find a "slit scan" style actor that I could try to edit... any idea? thanks a lot ! 



  • I just Googled "slit scan ffgl" and came up with a bunch of potentially interesting results. Don't know if they'll lead anywhere, but give it a shot!

    Cheers,

    Hugh


  • Beta Tester

    thx @CitizenJoe I did search in shader toy but this one I can't compile...`if y ou have an idea ;) Bests

    https://www.shadertoy.com/view...


  • Beta Platinum

    Hi there, 

    The texture command doesn't exist in the version that Izzy uses.

    @mark 

    Any idea about what version you use for the Shader compiler ? I get an error stating that I need atleast version 130 to compile the texture command.


  • Beta Platinum

    Okay.. I did some digging and I rewrote the shader partly so it works with Izzy

    https://gist.github.com/Juriaa...

    Please be aware that you need to download the texture from ShaderToy and put that inside an Picture player (Attach it to Video input 1)

    Also this code is done in 10 minutes, it might not be accurate to the actual shader. Will address this when I have more time and I don't have shows coming up :) This weekend most likely.


  • Beta Tester

    Hey @Juriaan thanks a lot, I had a look and it works fine with the picture but I expected it to work with video input too...;-( there's a result but it's a bit hard to get the same possibilities as slit scan...

    thanks though ! 


  • Beta Platinum

    You can just attach a video input to it.. Have you tried it ?


  • Beta Tester

    yes of course but it's a bit random style I don't really see as clearly as slit scan, which row or line ( or diagonal here) of pixel makes the painting...


  • Beta Platinum

    Okay, if you can provide an example of what you want we might be able to find an other alternative.


  • Tech Staff


  • Beta Tester

    @Woland yes I tried all idlab and isf converted shaders but could not find one equivalent with more input than slit scan !

    I'd need it smoother intact, to be able to size the lines frequency... 


  • Beta Tester

    @Juriaan 

    uriaan I'm searching for something smoother than isa slit scan actor where I could change the rate of slits François Vogel made cool things with AE tools...
    https://www.instagram.com/p/CA...
    I'm wondering if how it's possible to make it happen in real time but I guess so cos he's also doing live installations

    https://www.francoisvogel.com/...
    this last one is quite stunning relationship with time and space ! 


  • Beta Tester

    @mark  do you know if it would be possible to add a speed parameter to slit scan actor?

    thx ! 


  • Beta Tester

    here's a fun video with slit scan https://www.instagram.com/p/CC...


  • Tech Staff

    @bennnid said:

    here's a fun video with slit scan https://www.instagram.com/p/CC...

     Love this! Simple but effective. 


  • Tech Staff

    @bennnid said:

    here's a fun video with slit scan https://www.instagram.com/p/CC...

     That's awesome, do you mind if TroikaTronix shares it on our social media as well?


  • Beta Tester

    @Woland thanks a lot, I think I'm going to do a better one to share, this was only a 1st test;-)
    BTW do you know a way to get the FaceTime HD cam on MBP16' to manual brightness and focus? I tried webcam settings from Liang-Hsin Chen (mactaris@mac.com). But couldn't find a way to make it work with Catalina ( I guess authorization problem as for many soft since security "enhancement"...
    @mark, I found a way to change speed of slit scan by combining slit scan with matte++ to transform resolution allowing gaining speed, if there is another way let me know ;-) (see patch)
    In this version matte++ helps a lot to speed up slit scan drawing but I got some stairs when the frame moves to fast, so not solving a 100%...,could we be able to change slit scan speed, refresh, and quality?
    other problems;
    1) side scroller and flip GLSL makes a bad looking line junction when mirroring breaking the effect any better actor for that? 
    2) I'm wondering how to mix my layers in the better way to get a continuity... crop? effect mixer? I also tried alpha mask with blurred square from shapes to get a softer edge but I feel it's making a "dark" junction...
    What compositing technique would you use? Is there a blur edge actor you like? 
    3) How is it possible to use a video delay more than 1000 frames? ( I know it's really ram consuming but I have a lot... ), I tried though capture to disk but can't read on a writing file,. buffer could be a solution for more than 1000 frames?

    Thanks for your remarks and help!slitiza.izz


  • Tech Staff

    @bennnid said:

    do you know if it would be possible to add a speed parameter to slit scan actor?

    I forgot to say that I recorded this as a feature request.


    @Bennnid said:

    1) side scroller and flip GLSL makes a bad looking line junction when mirroring breaking the effect any better actor for that? 

    I'm not entirely sure I understand your description, but I'd suggest just experimenting with combining actors to see if you can get the desired effect. Also "Side Scroller and Flip" is not one of our GLSL or FFGL plugins from the TroikaTronix pack so I don't have it and can't see what it's supposed to do when I open your patch. Is this a third-party plugin?


    @Bennnid said:

    2) I'm wondering how to mix my layers in the better way to get a continuity... crop? effect mixer? I also tried alpha mask with blurred square from shapes to get a softer edge but I feel it's making a "dark" junction...
    What compositing technique would you use? Is there a blur edge actor you like? 

    Again I can't see what your patch is supposed to do because of the missing plugin so I don't quite understand what the issue is. You can mix multiple layers by setting two or more Projector actors' 'blend' mode inputs to "transparent", setting the layer to different numbers (higher numbers will be in front), and then feeding your different content to those different Projector actors. 

    Try Effect Mixer, Multimix, Contrast Adjust, HSL Adjust, Edge Blend Mask, TT Edgeblend (GLSL), TT Highlights and Shadows (GLSL), other TT GLSL Shaders, the TT FFGL effects, and all the video effects. 

    If you've got a dark spot you could try making a crop of just that area and sending it to the right place on the Stage with additive blending and adjust the contrast of that sliver until it's no longer dark.


    @Bennnid said:

    3) How is it possible to use a video delay more than 1000 frames? ( I know it's really ram consuming but I have a lot... )

    Proceed at your own risk (your computer may REALLY not like this) but you could chain together multiple Video Delay actors set to 1000 frames. (Note you will need to wait for 2000 frames until you'll actually see any video output because they won't have anything to display until the 1st frame from your video source is pushed all the way through by new frames and becomes the 2001st frame. Thus, if you're doing this live, know that you'd need to start video capture through these actors 66.7 seconds [assuming 30fps capture rate] BEFORE you want to project the result because from the time you start capture, the first frame to get through the 2000 frames of video delay will come at 66.7 seconds.)


  • Beta Tester

    @woland
    thanks for adding my request;-) (sorry next time I 'll go straight there ! )
    for side scroller and flip here's the link (maybe another isa GLSL or plug makes it better? ) https://editor.isf.video/shaders/5e7a7fa27c113618206de187
    and the converted GLSL https://we.tl/t-3Xzca6TNmQ
    thanks for all the blending tool I'll go trying those I haven't yet, 
    I tried chaining delays but relation between added time and measures delay Is a bit wired till now...

    thanks so much for your inputs! Bests