What it does
Models a stage and a lighting rig and works out the illuminance on the deck before anyone gets to the venue. Build the rig from truss, bars and stands, focus each fixture at a point on the stage and let it resolve the pan and tilt, then read the levels off a heatmap with the beam cones drawn over it. The part worth having is a single toggle between a horizontal plane and a vertical one: a rig can be perfectly even on the floor and flat and shadowless on faces, because overhead light arrives nearly edge-on to a vertical surface, and flipping between the two inverts the ranking of your fixtures. Every fixture carries a badge saying whether its numbers were measured from an imported IES or EULUMDAT file, transcribed from a named datasheet, or synthesised from an archetype — because a lux figure computed from a guess is worth nothing unless you can tell which is which.