Hisanari Otsu

Short Bio

Hisanari Otsu is a postdoctoral researcher in Computer Graphics Group at Karlsruhe Institute of Technology headed by Prof. Carsten Dachsbacher. He received Ph.D. from The University of Tokyo in 2018 advised by Prof. Toshiya Hachisuka. His research interests are physically based rendering and light transport simulation, especially using Markov chain Monte Carlo algorithms.

Research Interest

  • Physically based rendering
  • Light transport simulation


  • Sep. 2020: I will present a work at VMV 2020.
  • Aug. 2018: I have a paper conditionally accepted to SIGGRAPH Asia 2018!
  • Mar. 2018: I have received a Ph.D. degree from The University of Tokyo!
  • Feb. 2018: I have a paper accepted to Computer Graphics Forum!
  • Jun. 2017: Updated website
  • Apr. 2017: I have a paper accepted to SIGGRAPH 2017!


  • Portal-Based Path Perturbation for Metropolis Light Transport

    Hisanari Otsu, Johannes Hanika, Carsten Dachsbacher

    Vision, Modeling, and Visualization 2020

    [PDF] [Project]

  • Geometry-Aware Metropolis Light Transport

    Hisanari Otsu, Johannes Hanika, Toshiya Hachisuka, Carsten Dachsbacher

    SIGGRAPH Asia 2018

    [DOI] [PDF] [Project]

  • Reproducing Spectral Reflectances From Tristimulus Colours

    Hisanari Otsu, Masafumi Yamamoto, Toshiya Hachisuka

    Computer Graphics Forum

    [DOI] [PDF] [Project]

  • Supervised Learning of How to Blend Light Transport Simulations

    Hisanari Otsu, Shinichi Kinuwaki, Toshiya Hachisuka

    Proceedings of the MCQMC 2016

    [DOI] [PDF] [Project]

  • Fusing State Spaces for Markov Chain Monte Carlo Rendering

    Hisanari Otsu, Anton S. Kaplanyan, Johannes Hanika, Carsten Dachsbacher, Toshiya Hachisuka

    SIGGRAPH 2017

    [DOI] [PDF] [Project]

  • Robust Light Transport Simulation via Metropolized Bidirectional Estimators

    Martin Šik, Hisanari Otsu, Toshiya Hachisuka, Jaroslav Křivánek

    SIGGRAPH Asia 2016

    [DOI] [PDF] [Project]

  • Replica Exchange Light Transport on Relaxed Distributions

    Hisanari Otsu, Yonghao Yue, Qiming Hou, Kei Iwasaki, Yoshinori Dobashi, Tomoyuki Nishita

    SIGGRAPH 2013 Posters

    [DOI] [PDF]


  • Hisanari Otsu. Bridging Different Spaces in Light Transport Simulations. Ph.D. Thesis, The University of Tokyo. 2018. [PDF]
  • Hisanari Otsu. Optimized Path Sampling Strategy Selection for Trans-Dimensional Mutation in Metropolis Light Transport. Master’s Thesis, The University of Tokyo. 2015.
  • Hisanari Otsu. A Study on Global Illuination Computation Using Replica Exchange Light Transport in Locality-Relaxed Light Path Space, Bachelor’s Thesis, The University of Tokyo. 2013.


  • Super Creator, Information-technology Promotion Agency, Japan (IPA), 2016
  • Excellent research and presentation award (GCAD Award), Information Processing Society of Japan, 2015
  • Dean’s award, Department of Information Science, The University of Tokyo, 2013
  • Best Paper Award, Art Science Forum 2013 (domestic), 2013

Personal Projects

  • Lightmetrica : A research oriented renderer [Github]
  • Freestroke : 3D painting tool [Github]
  • minpt : A path tracer in 300 lines of C++ [Github]