[ANSWERED] where is 'Interlacer' actor?

  • ...reading about it in the manual...really want it for something I'm doing...perhaps it has been superseded or incorporated into something else?

    Running up-to-date v3.0.7 on Catalina.

  • Tech Staff

    The Interlacer actor is a deprecated (old) video actor that can only use vid-cpu. These "Classic" actors are hidden by default because they are inefficient and generally not recommended to be used. Wherever possible, we still kept them in the program for the sake of compatibility with legacy Isadora Patches, but some had to be removed because they no longer functioned.

    From the Isadora 3 Release Notes:

    Removed Classic/Legacy Actors
    All Classic Movie Player actors will no longer function. Unfortunately, removing the older QuickTime dependencies within the program meant that we had to remove a number of classic (i.e. "legacy/deprecated") Isadora actors. These actors were CPU-based, had already marked as deprecated in 2.6.1, and have been removed in Isadora 3:

    • Classic External Video Output 
    • Classic Movie Player Direct 
    • Classic Movie Player Direct Core
    • Classic Movie Player Direct Device 
    • Dither 
    • Image Tile 
    • Movie Player VR 

    To unhide the deprecated (classic) actors still in the program (including Interlacer), go to Isadora > Isadora Preferences > General (first preferences tab) > User Interface > and uncheck "Hide Deprecated (Classic) Plugins From Toolbox" (at the bottom of the screen).

    You could also see about finding a GLSL Shader capable of replicating the Interlacer (though don't use it in artistic work unless the license says that's alright because it's someone else's intellectual property). If you learn how to write GLSL code yourself or hire someone to replicate the Interlacer actor with a GLSL Shader then you'll legally be allowed to do whatever you want with it though.

    @Fred has made some fabulous GLSL Shaders and may be able to point you in the right direction if you want to try to go down that route.

    Best wishes,


  • @notdoc what do you need the interlace actor for specifically? If your video output is interlaced your system should handle that for you. Processing with shaders is done in 2x2 squares so separating the lines is not an easy task.

  • @woland

    thanks for this. sorry i missed your reply til now. I'm learning about shaders, but a long way off writing code myself..:-/

  • @fred

    thanks, and apologies for slow response. I was simply looking for the graphic aesthetic effect of the parallel lines of the two interwoven image sources. 

    Trying to replicate something I've done before with a frozen 'blinds' wipe transition in video editing software, but in a way that Isadora would allow me to link the parameters like width, and rotation etc responsively to audio. I can probably achieve it with a matte, but less immediate.

  • @notdoc I think you can get close to what you want from one of the shaders I posted here: https://community.troikatronix.com/topic/6474/some-new-glsl-effects

    Take a look at the one called "IDlab Glitch Cut slider" I think it will do close to what you want.

  • @fred

    thanks so much. I may get back to you with questions...I'm soaking up a lot of new stuff. If you have any suggestions of good places where a (currently) non-coding person trying to get a foothold can start learning how to understand more about using code in Isadora, I'd be grateful...



  • @notdoc if you want look into to creating your own GLSL effects, it is good to have an overview of how shaders work- you can look at this https://thebookofshaders.com/ but I would also suggest jut playing with shadertoy shaders and changing some numbers and see what they do.

  • @fred

    many thanks! really helpful.