Spanish engineers have made the first holograms of the world that you can touch and manipulate, realizing science fiction.
The achievement is detailed in an article published in the Hal Open Research Archive.
“What we see in the films and callograms of calls are typically volumetric exhibitions,” says the first author Elodie Bouzbib of the Public University of Navarra (UPNA). “These are graphics that appear in the air and can be seen from several angles without the need to wear virtual reality glasses. They are called true-3D graphics.”
The team says that there are commercial prototypes of volumetric screens. The examples are developed by Voxon Photonicsbased in southern Australia and Japanese company Brightvox Inc.
But these screens cannot be touched.
“We are used to directing interaction with our phones, where we play a button or drag a document directly with our finger on the screen: it is natural and intuitive for humans,” says principal researcher Asier March, also of the UPNA. “This project allows us to use this natural interaction with 3D graphics to take advantage of our innate vision and 3D manipulation skills.”
Volumetric screens work by projecting images in a fast Osption sheet called diffuser. Around 2,880 images per second are projected. Due to this high speed, the image appears as a 3D object.
The diffuser is usually rigid. This means that a hand that touches the volumetric screen would be injured or break the device.
A solution would be to use materials that are not so rigid. The challenge with this is that “elastic materials deform and require images correction,” says Bouzbib.
The team showed that the images can be corrected predicting how an image should be seen if the diffuser was not elastic and adjusting the future oscillations of the elastic diffuser to accommodate the manipulation.
The result is a virtual object that can be managed naturally.
“For example, grab a cube between the index finger and the thumb to move it and rotate it, or simulate the legs to walk on a surface using the index and ring fingers,” says the equipment.
“The screens such as screens and mobile devices are present in our lives to work, learn or entertainment. Have three -dimensional graphics that can be manipulated directly have applications in education; for example, visualize and assemble the parts of an engine. In addition, several users can interact in collaboration without the need for the virtual reality of reality.
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