What transformations should I apply to a model to produce this 3D effect? I saw a video on YouTube where a person uses a transparant, knotted pyramid to display "holograms" using their smartphone. (I have not been able to reproduce this yet, so I can't tell for sure if it works).

I was wondering, given a model, which transformations I should apply to get the different projections needed to produce this effect?
Assuming your optimal viewing angle is parallel to the surface of the display and the pyramid is made from faces that are 45 degrees to its virtual (non-existant) base, it's actually just a simple non-transformed image (besides the reflection).

1:1 projection. No transformations. No scaling.