This repository contains example materials for Weta Digital's PhysLight system as presented in the Siggraph 2020 Talk PhysLight: An End-to-End Pipeline for Scene-Referred Lighting. Slides can be found here.

The imaging notebook shows a simple example of calculating the imaging ratio and checking that it gives the correct response for an idealized camera system.

The data directory contains the spectral sensitivity curves of a number of cameras as measured with our 'lightsaber' system. It also contains a notebook that loads the data and plots the curves for visual inspection.

The physlight camera model notebook shows how to use the curves to convert from spectral radiance to Camera RGB, solve matrices to go from Camera RGB to XYZ, and compares different approaches for handling white balance.