A slab or roof slab object consists of a number of components whose display properties can be determined by the materials assigned to them.
You assign one material to each display component of the object. For example, you might assign a floor tile material to a slab body and a concrete material to a slab edge.
If you want to use the display properties of a slab or roof slab object or style, instead of using material display properties, you can turn off the material assignments in the display properties of the object or its style.
Material definitions consist of display components that correspond to component types of objects. For example, the Linework component of a material is used for all linework in Plan view. The Surface Hatch component of a material is used to hatch all object surfaces in 3D model views and elevations.
For a complete list of material components and their description, see About Material Components and Display Properties.
Roof slabs with assigned materials