Implement physically based cameras
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Duttenheim commented
Currently, the way we calculate luminance and exposure quite arbitrarily. Filament has a very comprehensive section on this topic:
https://google.github.io/filament/Filament.md.html#imagingpipeline/physicallybasedcamera
Basically what it boils down to is that a camera is defined not only by a transform, but also by three optical factors, shutter speed (in seconds), aperture (in f/x) and sensitivity (in ISO), which controls how much light is captured in the final output buffer.