A SquareSpotLight is a positional light in Point mode including a frustum attenuation gizmo.

It illuminates the objects inside the frustum. It includes a fade angle to smoothly cut off the light.

Set a gobo texture on a SquareSpotLight
  1. Locate the SquareSpotLight in the NodeList view.
  2. Select its Texture child.
  3. Set the Texture > File attribute with the gobo texture filename.

The spot light without no gobo, with the gobo and the gobo texture.

The User Guide/Lighting/Positional lights section.