ZW3D CAD Tips （Modeling —— Use the Clear Facets command）
You can use the Clear Facets command from the View Menu to clear all facet data (used for shaded display) from the active part. The next time the part is displayed in shaded mode, facet data will be regenerated. Deleting the facet data from a part before saving it will reduce the size of the resultant file. This command is not logged in the undo/redo history. Once executed, it cannot be undone. This is more of a space (file size) saving tip than a time saver.