Changing the mesh topology on each stroke creates lag when sculpting,
this option only updates the topology when pressing flood fill.
You can achieve a similar effect by disabling Dyntopo when sculpting
then enabling Dyntopo and pressing flood fill to change topology,
but re-enabling Dyntopo takes time, this option is faster.
The resulting workflow using this option is similar to Zbrush,
where with Dynamesh enabled, pressing Add button to update the
This feature skips the do_symmetrical_brush_actions method in
sculpt.c when flag is set.
To make the Flood Fill and Sample Detail options work and not be
disabled, their poll method had to be updated to take into account
In manual mode, Flood Fill and Sample Detail options use the
constant_detail to set the detail of the mesh.