Motion tracking using an IR emitter, a cheap security camera, and the Eyes++ actor can work very well.

I did this pretty successfully in a circus show the other year. The camera was mounted at the top of the tent, pointing downward, and the performer I wanted to track wore a hat with IR flashlights pointing straight up. These were incorporated into the costume design. I physically hacked the camera so the IR filter was always in place. 

Through this method we were able to project footprints onto the stage which closely and accurately followed the path of the performer. 
We were able to do left-right alternate footprints  using a technique that @bonemap showed in this excellent tutorial,  and get some directionality using some trigonometry which Mark shared in this post.

Here's a link to video from an early investigation - I think you can see the subject maybe holding the torch - and the zipped up Isadora file with the only relevant media

https://drive.google.com/file/...


ir_tracking.zip

HTH

Mark (not that Mark)

@dbini said:

(inputs for width of slit and speed would be nice, horizontal and vertical offset might be interesting)

 Logged :)

I am looking for an expert Isadora for collaboration in theater (Computer Vision & Interactive Projection). The deadline for submitting the call is tomorrow. Contact me privately for details👽

@DusX Thanks for your fast reply. I know Isadora on Windows and macOS is fully tested, but I’m very curious to try it on hardware running Linux. My experience with the latest Windows updates done by Microsoft has not been the best, and I just wanted to know if someone here has attempted the same thing recently.

I’ve seen Linux growing a lot in recent years, and I’ve already migrated a large part of my workflow there for other things.

My main workload is still happening on macOS, but for installations and other projects, I use Linux a lot.

@judgeworks

Once you have these devices sending you OSC, they are very easy to use. So a demo patch doesn't make much sense until you know what you want to do with the OSC data.

@jfg @woland and everyone else who has assisted, I'm SO grateful for your wisdom and time! These examples are just what was needed.

This forum and its community is wonderful.

Many, many thanks!

Simon

@jrhooker said:

I have a step back version but it's a whole day of work.

 Because I often work on things where I'm pushing Isadora to the absolute limit, I've gotten into the habit of making incremental saves every hour or two. I rarely need them, but when I do, I'm very glad to have them.

@jrhooker

Was that helpful at all?

@codyseehunt

you will find the Mac OS versions here:

https://github.com/ohglobal/NDI-Classify/releases

scroll down to find 1.1 Update (Mac OS) and then click on Assets

The Enttec DMX control actor is a little difficult to set up, but if you have the correct channels set, then it should function in the same way as a lighting desk. The times when I had a problem controlling lighting through the Enttec was fixed by experimenting with different speeds in the Serial Port setup - sometimes the default speed is too fast for the device.

@filpi2

I'd recommend building your file using the OSC Address Listener actor.

That way, whatever tool you made to do this can be put into a User Actor and used in any file instead of being locked to this one specific Isadora file because of Stream Setup.

@mark_m said:

Thoughts? Explanations? Logic?

 It's showing the size of a blank character (space). Notice that if you leave the 'text' field blank or put a space in it, the text width/height doesn't change. Seems like a bug. I'll log it.

@mark_m said:

I can get around this using a limit-scale-value actor, but still curious as to why this is happening...

Here's another (admittedly more complicated) way (check the top right Comment): dynamic-subtitle-background-2026-04-24-4.1.3.izz

@codyseehunt

Sales & Licensing questions are better to ask using the support ticket link in my signature.

Our S&L staff don't use the forum.

@eight

I'm also going to log a feature request to move this to the Actor menu. Doesn't make sense that it's not with all the other actor-related show/hide menu options.

@eva said:

Could this be possible, to swich between multiple different videos and simply having one output?

Yes, quite easily:

https://troikatronix.com/add-ons/video-switcher-user-actor-example-file/

@woland

Thanks

@chorus

I'll see if I can update them, asap. 

In the meantime I found this post from Woland. 

"""

The newest version of the Rokoko Studio Live Watcher (which comes in the download for Isadora 4.0.7) and the newest version of the Rokoko Studio software should work with the v1 suit. 

The tutorial and actor that come in Add-Ons Page download for the Rokoko Studio Live Watcher should work if you need to use the legacy version of the Rokoko Studio Software for the v1 suit.

Either way, you will also need to get the first paid tier of subscription for the Rokoko Software in order to stream the data from their software to any other software. The "Plus" tier costs $20USD/month. 

If you run into any trouble just send in a ticket (link in my signature) and I can personally walk you through it since I have my own v1 suit.

"""

From: https://community.troikatronix...

This seemed like useful information to share if you hadn't found this yet. 

Hi all

Many thanks for the pointers and info. Sorry for not getting back earlier, just the day it has being.

I think jfg has nailed it for me.

The Trigger Text actor seems to be what I seek.

I have been overthinking this. I, effectively, juat need a placeholder that allow me to have a one button entry for a set time which enables the streamdeck usage.

My custom timer has a countdown that works like a traffic light in terms of the colour warnings. I do a lot of death by powerpoint and I am looking to use the timer as a notification to the presenters.

By using the trigger text actor, I can set the placeholder for the time on the screen. This time may change from presenter to presenter and I am just looking to automate this via a streamdeck. Not all around me are familiar with Isadora (give it time!) etc. Previous to this, I was just editing the various sections on the patch. I now have other people coming into the workplace and this will allow me to populate the streamdeck with standard times, start, stop etc in the streamdeck.

I was confusing the issue with TC but JFG's suggestion got me thinking ref the trigger text. I have two items I wish to achieve, a placeholder and a countdown timer. I was looking at this process as one action rather than two actions if actually is.

I had a quick try out and in a rough manner it works. 

Many thanks all and I will gladly accept the award for the most obtuse query of the year.

Hopefully that explains my methodology.

Thank you

eamon

@eamon said:

You can use the Brave browser if you do not have youtube premium. It removes all the ads.

 Off topic: I've never heard of Brave Browser before - it looks amazing. Thanks, for the tip!

Cheers,

Hugh

@ray said:

Don't know what I did

 I would take note of which USB ports you are using, this likely is playing a role. (some USB C ports offer more features than others)