Shape Allows you to select one of the default shape (square, sphere, disk and cylinder), or specify a custom geometry (the mesh of a torus shaped filament in this example). Visible to Camera Makes the light source visible to the camera (a.k.a primary rays). From left to right: off (default) and on. Two Sided When enabled, the area light will illuminate from both sides. Note that this has no effect with the sphere shaped area light. From left to right: off (default) and on.