I have an idea for a new PieceTracer tool that would make it much easier to fill surfaces with pieces: Fill-and-Shear. I wanted to see what people thought of it. Is this something you might use?
First you place a piece on a surface, and click on it with the tool. That creates a copy of the piece, which you position into place before clicking again.
Now a second copy of the piece is created, and you position it into place before clicking a third time.
The location of the two copies determines the horizontal and vertical spacing between the pieces (in this case there is no spacing), the horizontal axis, and the transverse motion of the pieces as they move in the vertical axis.
The result is shown here: the entire face is instantly filled with the pieces. Pieces are sheared off at the edges to ensure that the entire surface is filled.
As usual with PieceTracer, the pieces carve into the surface, so you can immediately start working on the next surface down.