ThumbnailPostLook
The post values of a thumbnail: the exposure and the bloom of the preview look (material-editor §CME-11).
Declared in src/libs/libconstruct/construct/ui/ThumbnailUniforms.hpp.
Detailed description
The thumbnail's forward stage writes linear values; ThumbnailRHIContext:: recordPost() then runs the bloom and the finish pass with these values. A plain value, so a render request carries it to the worker thread. Its defaults are a look with no bloom and no exposure.