Spot#
A spot light is a plane light which the illumination is constrained within a cone. You can control both Cone Angle and Falloff Angle and the size of the spot can be modified using the Radius attribute.
Projection Mode#
Spot lights have two projection modes used to evaluate the projected color: Legacy Area and Lens Defocus.
Legacy Area#
Legacy Area mode can be used to project a gobo map or fake a simple projector but has limited control.
Projection Mode set to *Legacy Area*
Lens Defocus#
Lens Defocus mode turns the light into a realistic thin-lens spot light. It can be used to simulate accurate projection effects on which you can set the distance on which the texture is in focus.