Editing Solid modeling (section)

===Spatial occupancy enumeration===
This scheme is essentially a list of spatial ''cells'' occupied by the solid. The cells, also called [[voxel]]s are cubes of a fixed size and are arranged in a fixed spatial grid (other polyhedral arrangements are also possible but cubes are the simplest). Each cell may be represented by the coordinates of a single point, such as the cell's centroid. Usually a specific scanning order is imposed and the corresponding ordered set of coordinates is called a ''spatial array''. Spatial arrays are unambiguous and unique solid representations but are too verbose for use as 'master' or definitional representations. They can, however, represent coarse approximations of parts and can be used to improve the performance of geometric algorithms, especially when used in conjunction with other representations such as [[constructive solid geometry]].