In VirtualLab Fusion, non-sequential tracing is enabled by adjusting the channels of each surface. This use case shows the definition of channels by using an example of a waveguide with two surfaces. Channels of each surface are adjusted and the consequences of the settings are shown. Furthermore, on a surface, grating regions can be defined. Setting of the region channels are not necessary to be identical with the surface channels. This use case shows how to set regions on a surface and how to adjust the channel configuration of a region.
