Control Layer Stacking

It is possible to control the order of layers such that (say) a tall tree layer is on top, an understory layer next followed by (say) a paving layer. In this way, it is possible to create quite complex graphics. In the figure below, the canopy of the tall Gleditsia spp. covers the stepping stones.

Stack order

Stacking layers 2

MovieHere is a link to a short movie showing how this is done