A composite surface is a collection of connected surfaces. The components can be any surface type, including nesting composite surfaces. While it is often expected that composite surfaces are contiguous, no such topological restrictions are enforced by FME in storing composite surfaces.
The orientation of the composite surface is determined by checking the orientation of the first surface. It is intended that all members of the composite are oriented in a way consistent with their neighbors. That is, it is not expected that connected adjacent surfaces have opposing orientations, like in a checkerboard. However, no such adjacent orientation restrictions are enforced by FME in storing composite surfaces.
If required, transformers may be used to alter or repair composite surfaces.