The Extract/rebuild buttons

As introduced in the previous pages these buttons allows to extract object(s) to be moved or copied/pasted from the model, into single piece object(s). The effect on motion is illustrated in sections and 6.2.1, the effect on copy is the following:

Illustration of the rebuild process, a fragment is copied from the top figure and pasted back in new projects. That fragment appears split because of the PBC: on the left the fragment is rebuild as a singe object, on the right the 2 pieces remain separated.