Fig. 2.
Geometric relations between infinitesimal areas dA around the locations x and y. The normal vectors are denoted n(x) and n(y), respectively. The graphic shows how the surface at position y is illuminated by the Sun at an incidence angle ι⊙ and reflects light at an emission angle η which is received at location x at a distance d and incidence angle ι.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.