The project's webpage links to mitsuba, but no microfacet method in mitsuba references the paper (it references other microfacets papers). The examples to reproduce the experiments are not provided, so I was not able to reproduce the results of the paper. To compile mitsuba on ubuntu 18.04, in config.py I changed -std=c++11 into -std=gnu++11 ; in mitsuba/build/release/mtsgui I changed QtCore, QtOpenGL (and so on) into Qt5Core, Qt5OpenGL (and so on) ; in data/scons/qt5.py,line 392 changed QtCore into Qt5Core.
There appears to be an implementation of the paper by a different author: https://github.com/lxs137/glint_mitsuba
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