Field Value

Type: Single

Positive values point from the layer toward the viewer, and negative numbers point from the viewer toward the layer, so negative numbers would be more common for this value because light sources are generally positioned (with lightZ) on the same side of the layer as the viewer. Aim is mostly noticeable when apertureFocus is used to focus the light in one direction, however, if aim is not set, the light will not be visible. The size of the aim vector does not matter because it is normalized to a unit vector; only the direction matters.