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\bibitem{lowe:2005}
N.~Lowe and A.~Datta, ``A new technique for rendering complex portals,''
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\bibitem{aliaga:1997}
D.~G. Aliaga and A.~A. Lastra, ``Architectural walkthroughs using portal
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\bibitem{abrash:2013}
\BIBentryALTinterwordspacing
M.~Abrash, ``Why virtual reality is hard (and where it might be going),''
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\bibitem{boletsis:2017}
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C.~Boletsis, ``The new era of virtual reality locomotion: A systematic
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\bibitem{lochner:2021}
D.~Lochner, ``Vr natural walking in impossible spaces,'' \emph{Motion,
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\bibitem{monoscopic-stereoscopic:2020}
M.~B. Taştı and Ümmühan Avcı, ``Examination of using monoscopic
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\bibitem{back-face-culling:2007}
D.-B. Jeon, S.-Y. Kim, K.-Y. Lee, and J.-C. Kwak, ``A design of a 3d graphics
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\bibitem{lod:2005}
J.~Ji, E.~Wu, S.~Li, and X.~Liu, ``Dynamic lod on gpu,'' in \emph{Proceedings
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\bibitem{vlachos:2015}
\BIBentryALTinterwordspacing
A.~Vlachos, ``Advanced vr rendering,'' \emph{Game Developers Conference 2015},
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\bibitem{vlachos:2016}
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\BIBentrySTDinterwordspacing

\bibitem{nvidia-sps}
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\end{thebibliography}