NVIDIA Corporation
Ray-tracing for auto exposure

Abstract:

In various examples, a virtual light meter may be implemented along with ray tracing techniques in order to determine incident light values--e.g., incoming irradiance, incident radiance, etc.--for adjusting auto exposure values of rendered frames. For example, one or more rays may be used to sample incident light over a sampling pattern--such as a hemispherical sampling pattern--for any position in a virtual game environment. As a result, the incident light values may be sampled near a subject of interest in a scene or frame such that exposure values are consistent or stable regardless of the composition of the rendered frames.