Hi AlexC.,

Yes that IOR. To calibrate the "Lens" I would set a camera straight to the image and far away, with a 500 or 1000mm focal length. Then dial the IOR until the image is close to the original (meaning it is not stretched and does not contain parts of the other image).
(Image below shows too much magnification)
Screenshot 2025-07-25 at 10.44.44 AM.jpg

Yes, three is possible, with three stripes and a higher IOR. Three stripes means slimmer stripes and more magnification. Here, the feeling of these Lenticular Postcards becomes more apparent, and its imperfections deliver that feeling even more.
If these artifacts are too prominent, then the lens needs to be smaller, or perhaps shaped differently

Here is a snapshot from a postcard I bought in the spring while visiting Germany and the Filmmuseum in Frankfurt. If I'm not mistake it has five images in use. This also demonstrates the analog artifacts of this technique very nicely. In my opinion, perfection here would ruin this.
Filmmuseum_Frankfurt_IMG_0620.jpg

I assume that the aesthetic of this effect should be evident, if it is just a blend of images, which could be done faster, as mentioned above.

Example with three: (Images for demo use here only)
https://projectfiles.maxon.net/Cineversity_Forum_Support/2025_PROJECTS_DRS/20250725_CV4_2025_drs_25_ANll_03.zip

My best wishes for your project

You're very welcome, AlexC.

Before I studied architecture, I had three years of training to become a Technical Drawer; to create or read those "blueprints" is second nature to me. Which makes me confident to have shared the fastest way. Thanks for checking this out.

Your intuition about the Arc was not off.
It can be done with an Arc, four of them, but the problem here is that the center point of each Arc is not in the center of the tent. This causes a lot of trial and error, especially since the "blueprint" has no orthogonal view to this quarter arc, like when it lies on the ground to be assembled. The radius of an Arc here is 12.80m-13,50m (+/-) based on taking it from the "blueprint". Using the three orthogonal view (Multi View) re-engineering method is faster and has no guess-part in it. Anyway, your intuition was good.

Enjoy your project

You're very welcome, AlexC.

My best wishes for your project!

I'm glad it works for you, AlexC.,

Thanks for the feedback

My best wishes for your project

Thank you very much, AlexC.

The point selection works with the Cloner (the ones used for the Tracer, each time), and produces only data where the selection is by the Mode> Object (Source).

All the best

Thank you very much, AlexC,

I'm glad to hear that it works for you.

Enjoy!

Thanks for the feedback, AlexC.,

You're very welcome.

Happy Holidays!

Thank you very much for your reply, AlexC.

It was a pleasure to explore.

Enjoy

You're very welcome, AlexC.,

My best wishes for the project.

Thank you very much for the feedback, AlexC.

When you use Sag>Fixed, the entered value matches very closely.

My best wishes for your project!

You're very welcome, AlexC.

Enjoy your Weekend

Thanks for the reply, AlexC.,

My best wishes

Hi AlexC,

Thanks for the update.

Yes, the new Particle system is just a start (v1).

Enjoy your project.

You're very welcome, AlexC.

ShareX: I have to check and ask about this, but so far it is not on my "safe to use list". Sorry, we have to keep things here very tight, I share too much to take any chances.

My best wishes for your project.

Thank you very much, AlexC.

It might work based on the project's needs and how long it will be visible, but these are not solutions.

My best wishes

You're very welcome, AlexC.

If images or video are projected on these three parts, while the middle material contains both resources, the illusion should work nicely.

Cheers

Thanks for the kind feedback, Alex.

It is, as before, one of my favorite themes and any kind of projection! I love this work.

A complete projector simulation might also include the F/value of the used lens.
This always goes hand in hand with the surface it is screened on.

If the projector is not axial to the screen, that might require some extra care.

In my color training (Color Grading and Color Science) over the years, I learned that Cinema Theater has 48 Nits*, whereas HDR TV screens are between 600 and 4000 Nits, with an average of 1000 Nits. Yet the *Theater often looks more impressive and tends to increase slightly to cover the HDR dynamic.
The main reason is that the larger the screen and the darker the room, the more the impression is given that it is very bright. That calculation might not find its way into the plug-in.

I write about that, as often a precedent is put into one's contract, and the reality might be different; for those cases, I would like to share my expectation management here.

I hope you have a great Holiday Season and enough exciting challenges with your work.

You're very welcome, AlexC.

Enjoy!

Thanks a lot, AlexC!

My best wishes for your project.