Tomáš Mariančík

Tomáš Mariančík, known online as Frooxius, is a Czech virtual reality developer. He created the gaze-driven VR demo SightLine: The Chair, the educational project World of Comenius and the social VR platform Neos VR, and since 2023 he has led development of the social VR sandbox Resonite at Yellow Dog Man Studios in Ostrava.

Mariančík began making VR software with the Oculus Rift DK1. SightLine placed third in the 2013 VR Jam run by Oculus and IndieCade, and its 2014 follow-up SightLine: The Chair became a popular demo for the Oculus Rift DK2. With Karel Hulec he then worked on World of Comenius, which grew into Neos, published by Hulec's company Solirax. Road to VR described Mariančík in 2019 as Neos VR's co-founder and lead designer. He resigned from Solirax in April 2023 amid a long dispute with Hulec, the remaining Neos development team resigned in September 2023, and Mariančík went on to lead Resonite, which entered Steam Early Access on 6 October 2023.

Reviewed 11 October 2026. Checked dates, names, awards, figures and quotes against the cited Road to VR, UploadVR and Voices of VR articles, the SOC Intel ISEF results list, the archived 2016 blog post, Ryan Schultz's report of the Neos team statement, the Yellow Dog Man Studios site and imprint, the Resonite wiki team page, and the Steam store pages and Steam news posts for SightLineVR, Neos VR and Resonite. About review dates.

Early life and education

In a 2016 blog post, Mariančík wrote that in his last years of high school he developed a series of experimental processor architectures, with softcore implementations on FPGA boards, programming languages and compilers for them, and that the work took him through the Czech national science fair to the Intel International Science and Engineering Fair (ISEF) in the United States in 2012. The Czech secondary-school science competition SOC lists Tomáš Mariančík among the Czech entrants at the 63rd ISEF, held in Pittsburgh in 2012, with the computer science project "Experimentální procesorová architektura atto WPU 0,9" (experimental processor architecture atto WPU 0.9), which won a fourth grand award.

He wrote that he left university after the first semester to pursue his own projects, made mobile games in the Unity engine and took contract software development work to support himself.

Career

SightLine

Mariančík backed the Kickstarter campaign for the Oculus Rift development kit, and the Yellow Dog Man Studios biography describes him as one of the early supporters of the Oculus Rift DK1. For the 2013 VR Jam held by Oculus and IndieCade he built SightLine, a game based on a missing sense of object permanence: the world changes when the player is not looking at it. It placed third. In his account, an Indiegogo campaign to fund a full game did not reach its goal.

SightLine: The Chair, released for the Oculus Rift DK2 in 2014, condensed the jam game's gaze-based mechanic into a seated experience with no conventional controls. Writing in August 2014, Road to VR's Paul James called it his new reference demo for the DK2's positional tracking and low-persistence display, and credited Louis Arrigoni as the project's producer and audio lead. Kent Bye of the Voices of VR podcast wrote in 2015 that the demo uses change blindness to cut between scenes. Version 1.8 (September 2015) moved the demo to Unity 5 and Oculus SDK 0.7 and added optional Leap Motion hand support, and in April 2016 he released versions for the Oculus Rift CV1 and HTC Vive.

Both pieces were later released together on Steam as SightLineVR, which lists Frooxius, Louis Arrigoni and Ondrej Pultar as developers and Solirax as publisher. The Steam page describes the 2013 jam experience as remastered with the OpenVR SDK, and lists a "Most Immersive" award at the 2014 Virtual Reality Awards and a Grand Award at the Kaleidoscope VR Film Festival.

World of Comenius and Solirax

Mariančík met Karel Hulec, who had started the RiftUP upgrade kit project, after Hulec contacted him about his VR work; in Mariančík's description, Hulec handled communication and business while he concentrated on development. Their joint project World of Comenius, named after the 17th-century Czech teacher John Amos Comenius, was an educational VR application controlled with a Leap Motion sensor mounted on the front of an Oculus Rift DK2. Road to VR reported in October 2014 that Mariančík did most of the design and development, working with people from VR Union, the group behind RiftUP, and that a pilot was scheduled to launch on 20 October 2014 at Mendelovo Gymnázium, a secondary school in Opava. Mariančík said the software would let users play with atoms to get a feel for their behavior at the quantum level, swim inside a cell, or meet people from history and explore the places they lived in. Earlier that month Road to VR had covered an educational prototype of his hand-driven "holographic" interface, in which the user brings up menus and gestures with tracked hands, drags the world around with a clenched fist and inspects a human skeleton and organs. World of Comenius took third place and US$2,000 in Leap Motion's 3D Jam, announced in January 2015.

In January 2015 Solirax, listed as the developer of World of Comenius, was one of 13 startups in the first class of Rothenberg Ventures' River accelerator, which gave each company a US$100,000 investment and three months in its San Francisco office. Mariančík wrote that World of Comenius "slowly transformed into Neos" during this period.

He also worked on light fields, which he wrote he had taken up as a side project in December 2014. In the Voices of VR interview he described integrating light fields into a conventional graphics pipeline: objects rendered offline in tools such as Blender (his demo diamonds took a whole day to render on a GTX 980) could be placed in a Unity scene like ordinary 3D assets, with new views synthesized in real time. He said that with VR Union he was developing a rig to capture real objects and environments as light fields for use in VR scenes, including Unreal Engine ones. In the same interview he said that Leap Motion had used World of Comenius to demonstrate its OSVR integration, and that he had helped integrate VR Union's headset into OSVR.

Neos

Neos: The Universe, an educational experience, won in the Bronze Apps or Experiences category (US$10,000) of Oculus' Mobile VR Jam 2015, announced in June 2015. In December 2015 he released Holosphere, an experimental locomotion method that draws a geodesic sphere around the viewpoint and blurs the rest of the scene during artificial movement, as a modified build of the Oculus Tuscany Demo, and asked testers to describe their experience with it in a short online form.

Neos VR, a social VR platform with in-application building tools, was released in Steam Early Access on 4 May 2018, with Frooxius as developer and Solirax as publisher. Road to VR described the platform in 2019 as an "operating system for virtual reality" for building worlds without a separate game engine or coding, and noted that its Ethereum-based token, Neos Credits (NCR), was then in an initial coin offering. In October 2021 Mariančík published a Neos build that removed all token functionality from the Steam version at Valve's request. The following month he announced "The Universe", a rebuilt version of the 2015 jam experience inside Neos that takes the player from elementary particles to the observable universe.

Road to VR described a "cryptocurrency-fueled rift" between Mariančík and Hulec, the chief executive of Solirax. A statement by the Neos development team, quoted by social VR blogger Ryan Schultz, says that Mariančík resigned from his position at Solirax on 24 April 2023 "due to increasing difficulties in establishing the trust necessary to continue his partnership" with Hulec. The remaining developers, including the leads of the moderation and quality control teams, announced their own resignations on the Neos Discord server in September 2023 after negotiations with Hulec failed. Road to VR reported that Hulec still managed Neos. The Steam page now lists Neos VR as discontinued and no longer available on the store.

Resonite

Mariančík formed a new team to build Resonite, a social VR platform centred on user-created content. Road to VR reported in October 2023 that Resonite was receiving more than US$25,000 a month through Patreon, while Neos had fallen from a peak of over US$18,000 a month to a little under US$5,000. Resonite launched in Steam Early Access on 6 October 2023; the Steam listing names Yellow Dog Man Studios and Frooxius as developers and Yellow Dog Man Studios as publisher, and Mariančík wrote the launch announcement. Yellow Dog Man Studios is registered in Ostrava, Czech Republic, and its website lists Mariančík as "Lead Developer / Director". The official Resonite wiki's team page, last edited in August 2026, lists him as lead engineer on the core development team and as director on the business team.

After a community survey in May 2024 in which performance was the most requested priority, the studio made engine performance its main focus. The resulting update of 20 August 2025, announced by Mariančík as "The Big Performance Update (aka The Splittening)", moved Resonite's FrooxEngine out of Unity into a separate process running on the .NET 9 runtime, with Unity kept mainly for rendering. The changelog credits the multi-process rework to Mariančík, with contributions from community members, and the post says the studio plans to replace Unity's renderer completely in the future. As of September 2026 Resonite was still in Early Access, and Mariančík was still publishing its build release notes on Steam.

Selected works

Year	Work	Notes
2013	SightLine (SightLine VR Jam Prototype)	Third place, Oculus and IndieCade VR Jam 2013
2014	SightLine: The Chair	Seated, gaze-driven demo for the Oculus Rift DK2; later released for the Rift CV1 and HTC Vive
2014	World of Comenius	Educational VR with Leap Motion hand input; third place, Leap Motion 3D Jam
2015	Neos: The Universe	Bronze Apps or Experiences winner, Oculus Mobile VR Jam 2015
2015	Holosphere	Experimental locomotion technique for reducing nausea
2018	Neos VR	Social VR platform; Steam Early Access, published by Solirax
2023	Resonite	Social VR platform; Steam Early Access, Yellow Dog Man Studios

See also

• Resonite
• Holosphere
• SightLineVR
• Social VR