6.5 The hover probe

Turn the probe on from the rail on the left of the viewport, then move the cursor over any surface.

The probe readout over the screen — Figure 6.5 The probe: total illuminance, best available pixel density, how many projectors reach the point, and each machine’s contribution with its incidence angle. Here 127 lx at a point both machines reach — 70 lx from Epson CO-FH01 (1) at 23° and 58 lx from (2) at 19°.

The per-projector breakdown is the useful part. In a blend it tells you how the total is being split; on a spill it tells you which machine is responsible.

Where nothing reaches, the probe says No light reaches this point rather than reporting zero — a shadow and an unlit surface are different problems.