“What we see in films and call holograms are typically volumetric displays,” said Bouzbib, the lead author of the work. “These are graphics that appear in mid-air and can be viewed from various angles without the need for wearing virtual reality glasses. They are called true-3D graphics.”
Here is a link to the PDF that details the work: https://hal.science/hal-04981007v1/file/FlexiVol___CHI25 (2).pdf
I’m not sure touching is important. Have a touchpad for rotation if you are too lazy to physically move around object. Buttons for 45* rotations at a time would be even cheaper. Then, if purpose of display is to have many people around it, for “presentation purposes”, then a 2d screen and 3d rotation software will show objects in much better resolution and cheapest of all, while focusing on angle that matches presentation point.