(moved from 3D Art Showcase to Technical Talk) Good luck extracting the models. A quick search seems to indicate there are tools to query character models here https://www.rdr2mods.com/downloads/rdr2/tools/45-openiv/
@brurpo Those arealight corners can currently not be queried inside ShaderFX. They would need to be added (had no idea they were exposed to the API to be honest!)