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{{see also|Terms|Technical Terms}}
{{see also|Terms|Technical Terms}}
{{see also|Accessories|VR Accessories|Input}}
{{see also|Accessories|VR Accessories|Input}}
A [[3D stylus]] (sometimes called a '''VR pen''' or '''spatial stylus''') is a pen-shaped input device that tracks motion in three-dimensional space, providing six degrees of freedom (3[[DOF]] position + 3DOF orientation). It enables precise pointing, drawing, and manipulation tasks that would be awkward with bulkier [[motion controllers]] or bare-hand tracking.<ref name="RoadToVR18"/>
A [[3D stylus]] (sometimes called a '''VR pen''' or '''spatial stylus''') is a pen-shaped [[input device]] that tracks motion in three-dimensional space, providing [[6 degrees of freedom]] (3[[DOF]] position + 3DOF orientation). It enables precise pointing, drawing, and manipulation tasks that would be awkward with bulkier [[motion controllers]] or bare-hand tracking.<ref name="RoadToVR18"/>


[[File:MasslessPenVRStylus1.png|thumb|The **Massless Pen** 3D stylus used with a VR headset<ref name="RoadToVR18"/>]]
[[File:MasslessPenVRStylus1.png|thumb|The **Massless Pen** 3D stylus used with a VR headset<ref name="RoadToVR18"/>]]
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Within fully immersive [[virtual reality]] and [[augmented reality]] (AR) [[head-mounted display]]s, a stylus offers a tangible “pen tip” that affords millimetre-scale accuracy. User studies comparing interaction modalities found that a stylus was the most precise for annotation, whereas hand tracking was the least. Pairing a stylus (for pointing) with a traditional controller (for grabbing) yielded the best overall performance.<ref name="ApplSci23"/> In AR, a stylus can be used to draw directly onto holographic content, e.g. labelling anatomical structures, which mitigates occlusion problems inherent in finger gestures.
Within fully immersive [[virtual reality]] and [[augmented reality]] (AR) [[head-mounted display]]s, a stylus offers a tangible “pen tip” that affords millimetre-scale accuracy. User studies comparing interaction modalities found that a stylus was the most precise for annotation, whereas hand tracking was the least. Pairing a stylus (for pointing) with a traditional controller (for grabbing) yielded the best overall performance.<ref name="ApplSci23"/> In AR, a stylus can be used to draw directly onto holographic content, e.g. labelling anatomical structures, which mitigates occlusion problems inherent in finger gestures.


==Notable devices and manufacturers =
==Notable devices and manufacturers==
* '''[[Wacom VR Pen]]''' (2020) – pressure-sensitive tip, thumb wheel, and inside-out optical tracking independent of base stations.<ref name="RoadToVR20"/>
* '''[[Wacom VR Pen]]''' (2020) – pressure-sensitive tip, thumb wheel, and inside-out optical tracking independent of base stations.<ref name="RoadToVR20"/>
[[File:WacomVRPen1.png|thumb|The [[Wacom VR Pen]] for creative VR workflows<ref name="RoadToVR20"/>]]
[[File:WacomVRPen1.png|thumb|The [[Wacom VR Pen]] for creative VR workflows<ref name="RoadToVR20"/>]]


* '''[[Logitech VR Ink Pilot Edition]''' (2019) and '''[[MX Ink]]''' (2023) – [[SteamVR]]-tracked and [[Quest]]-tracked styluses oriented toward design and VR art.<ref name="RoadToVR19"/>
* '''[[Logitech VR Ink Pilot Edition]]''' (2019) and '''[[MX Ink]]''' (2023) – [[SteamVR]]-tracked and [[Quest]]-tracked styluses oriented toward design and VR art.<ref name="RoadToVR19"/>
[[File:LogitechVRInkPilotEdition1.png|thumb|The **Logitech VR Ink Pilot** stylus next to a Vive controller<ref name="RoadToVR19"/>]]
[[File:LogitechVRInkPilotEdition1.png|thumb|The **Logitech VR Ink Pilot** stylus next to a Vive controller<ref name="RoadToVR19"/>]]


* '''Massless Pen''' (2021) – high-accuracy stereo-tracked wireless stylus aimed at professional [[CAD]].<ref name="RoadToVR18"/>
* '''[[Massless Pen]]''' (2021) – high-accuracy stereo-tracked wireless stylus aimed at professional [[CAD]].<ref name="RoadToVR18"/>
* '''3D Systems Geomagic *Touch* / Touch X''' – desktop haptic styluses with 3-DOF force feedback.<ref name="3DSystemsTouch"/>
* '''[[3D Systems Geomagic Touch]] / [[Touch X]]''' – desktop haptic styluses with 3-DOF force feedback.<ref name="3DSystemsTouch"/>
* '''HP Zvr stylus''' – tethered IR-tracked pen packaged with the [[HP Zvr stereoscopic display]] for engineering & education markets.<ref name="TheVerge2015"/>
* '''[[HP Zvr stylus]]''' – tethered IR-tracked pen packaged with the [[HP Zvr stereoscopic display]] for engineering & education markets.<ref name="TheVerge2015"/>


Other projects include the open-source *OVR Stylus*, a 3D-printed vibrotactile pen for experimental VR research.<ref name="OVRStylus"/>
Other projects include the open-source [[OVR Stylus]], a 3D-printed [[vibrotactile pen]] for experimental [[VR research]].<ref name="OVRStylus"/>


==Historical development==
==Historical development==