This page describes various small tools that are used to manipulate our Complex objects. You should read the Generate Complex page before this page.
The Split Complex tool, found under the Edit tab, is used to decompose a selected Complex object into separate solids. In the images below, the leftmost image shows the original Complex. The next image shows what you would see if you ran Split Complex. Although it looks like the green edges have simply disappeared, in fact the three sub-regions have been separated into new Mesh scene objects. They will all be highlighted because the default is to select them all. However in the Object browser (shown to the right) you will see that three new "split" objects have been added. The rightmost image shows these seperate watertight solids shifted apart.
The Filter Complex tool is a simple one, it just deletes all the interior triangles and adds a new object to the scene for the surface-only mesh that remains. This is basically a way to "undo" creation of a Complex.
When you run the Select Tool on a Complex, you have an additional option Restrict To Exterior Faces. When enabled, the Sphere and SphereDisc brush modes will not select triangles on the interior sheets. The Unwrap brush mode will never select interior triangles (unless you create holes in the surface mesh).
When you drag-and-drop an open-boundary part onto a Complex, the property panel for the Drag and Drop tool will include a checkbox labeled Create Volume. If you check this, then when you accept the Drop, the part will be inserted as normal, however an Fill-style interior sheet will also be added at the dropped part boundary. As a result, the part becomes a new material region in the Complex, and hence you can add multi-material subregions via drag-and-drop.