As suggested in https://github.com/GafferHQ/gaffer/pull/5659, this patches Cycles to use the more sensible IOR default values that are coming in 4.1. It also enables CUDA and Optix devices if suitable devkits are found in the environment (if they are not found, as in our GafferHQ/build 2.x containers, then CMake just warns and those devices are skipped).
As suggested in https://github.com/GafferHQ/gaffer/pull/5659, this patches Cycles to use the more sensible IOR default values that are coming in 4.1. It also enables CUDA and Optix devices if suitable devkits are found in the environment (if they are not found, as in our GafferHQ/build 2.x containers, then CMake just warns and those devices are skipped).