CaTS [6]is an advanced example that is part of Geant4 since version 11. 0. It demonstrates the use of Opticks to offload the simulation of optical photons to GPUs. https://safeersappliancers.shop/product-category/bosch-dig97im50b-serie-4-built-in-90cm-3-speeds-b-island-cooker-hood-stainless/