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Hi! Author of the original post here. Please see:

https://disneyanimation.com/publications/

Or, for a continuously updated list of publications specifically about Disney’s Hyperion Renderer:

https://blog.yiningkarlli.com/2019/07/hyperion-papers.html

Most companies doing CGI work, both in games and movies, are quite open about their technical details. The whole industry relies on pooled research and development. While the actual code is typically confidential, publishing information serves multiple purposes for the work's publicity, the advancement of the field, the happiness of employees, and company prestige for recruiting people.

There have been quite a few publications about Disney's renderer called 'Hyperion', for instance https://dl.acm.org/doi/epdf/10.1145/3182159