Unity 3D: 2D Size in AR…?

I would like to recommend two video tutorials, both about how to create AR projects with entitled Unity3D and Vuforia, posted on Youtube by Art, Culture and Technology Purdue University: However, I am not a Unity developer, and my planned AR project will be my first. With this in mind, the following images have raised questions for me:

I understand that there are two models in the above pictures. What I wonder about is the file sizes of the two models. Is there a way to calculate the relationship between model size and total ARKit/ARCore file? (Assuming the model is simple, and has no animations.)

Fabian Winkler was kind enough to reply and his answers appear below.

To be most precise, I am interested in displaying photos in AR; an exhibition about Ipoh, Malaysia. The desired effect would resemble a slide show floating in air. But how can I describe to the developer how large the sizes should appear in AR? And before, I do this, how can learn about the total AR download file size? Sample images:

From the IPOH 38 iPhone Photographs by Bubiko Foodtour AR exhibition

trail of fog over Ipoh

From Stephen Black's 72 hour Facebook Live broadcast from the Abby Hotel

FROM FABIAN WINKLER: About your question: there is a proportional relationship between 3D model file (or slideshow images) and the image target that triggers it. You set this up in Unity where you can scale the 3D/image content in relationship to the size of your image target, this relationship will remain the same if the image target is detected in a real-world application.

For example, in the stills that you posted from my video: the size of the corn stalk has not changed in Unity, only the image target was much larger in one case (in the actual location on site - the cracks in the cross walk on campus) than in the other (a smaller print out of the same cracks) - thus the corn stalk also got proportionally scaled.

I would like to thank Fabian Winkler, for the videos. I was happy to discover his artworks.

Oh yes, if anyone would like to download a beta work-in-progress of the Ipoh photo exhibition, it's here.

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