Layers are created during model export from the source CAD system. Each layer can be toggled on or off independently. At the top of the layers menu is a set of layer controls:

New Layers - Adds a new user defined layer in LumenRT.

Select All - Select all the layers which present in the scene.

Select None - Deselects all the layers which present in the scene.

Invert Selection - It inverts the layer selection.

A color override can be selected and assigned to each layer. The slider next to each layer controls the color override opacity.

In the latest release of LumenRT Update 16 , layers section has been added with LumenRT terrain toggle. It allows to hide or unhide the existing LumenRT Terrain.