Come Nolo / Gaffer, lighting designer

The Virtual Position — CRLS Diffusion Explained

The Virtual Position — CRLS Diffusion Explained: lighting setup with reflectors.
Definition of virtual position and unfolded light path through three mirrors.
Mirror diffusion levels 1, 2 and 3: virtual source position and light falloff.
Three mirrors with three diffusion levels: cumulative effects on virtual source position.
From falloff to virtual source position: graphs and calculation from two illuminance readings.
Direct diffusion levels 1, 2 and 3: the virtual source moves forward.