WIP vhar_textures

2-perception/vhar-system/1-introduction.tex

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 % Even before manipulating a visual representation to induce a haptic sensation, shifts and latencies between user input and co-localised visuo-haptic feedback can be experienced differently in \AR and \VR, which we aim to investigate in this work.
+% Database of virtual visual and haptic (roughness) textures have been developed as captures and models of real everyday surfaces \cite{culbertson2014penn,balasubramanian2024sens3}
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+When we look at the surface of an everyday object, we then touch it to confirm or contrast our initial visual impression and to estimate the properties of the object \cite{ernst2002humans}.
+%
+One of the main characteristics of a textured surface is its roughness, \ie the micro-geometry of the material \cite{klatzky2003feeling}, which is perceived equally well and similarly by both sight and touch \cite{bergmanntiest2007haptic,baumgartner2013visual,vardar2019fingertip}.
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+Many haptic devices and rendering methods have been used to generate realistic virtual rough textures \cite{culbertson2018haptics}.
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+One of the most common approaches is to reproduce the vibrations that occur when running across a surface, using a vibrotactile device attached to a hand-held tool \cite{culbertson2014modeling,culbertson2015should} or worn on the finger \cite{asano2015vibrotactile,friesen2024perceived}.
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+By providing timely vibrations synchronized with the movement of the tool or the finger moving on a real object, the perceived roughness of the surface can be augmented \cite{culbertson2015should,asano2015vibrotactile}.
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+In that sense, data-driven haptic textures have been developed as captures and models of real surfaces, resulting in the \HaTT database \cite{culbertson2014one}.
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+While these virtual haptic textures are perceived as similar to real textures \cite{culbertson2015should}, they have been evaluated using hand-held tools and not yet in a direct finger contact with the surface context, in particular combined with visual textures in an immersive \VE.
 
 Wearable haptic devices have proven to be effective in modifying the perception of a touched tangible surface, without modifying the tangible, nor covering the fingertip, forming a haptic \AE \cite{bau2012revel,detinguy2018enhancing,salazar2020altering}.