Extended the bridge expansion algorithm to expand into sparse infill
by a maximum of 1 perimeter width. This solves a situation, where
the "ensure vertical wall thickness" region is filtered out as
too narrow to be important for print stability while the bridge expansion
only happened into the "ensure vertical wall thickness" regions before.
Partial revert of cf6b6ff4e4c47ebbe08f97cf80d923cde81c29af, reverts
Fix SPE-1726 - hole between bridges and perimeters caused by thin internal fill surface
GithubIssue https://github.com/prusa3d/PrusaSlicer/issues/10231#issuecomment-1546779200
During sorting of surfaces into top, bottom and internal, expand bottom bridges by one spacing unit, to ensure better anchoring
1) Flipped the order of "discover_vertical_shells" and "process_external_surfaces",
now the external surfaces are expanded after "discover_vertical_shells"
aka "ensure vertical wall thickness" is solved.
2) Reworked LayerRegion::process_external_surfaces() to only expand into
"ensure vertical wall thickness" regions, also the expansion is done
in small steps to avoid overflowing into neighbor regions.
also:
Utility functions reserve_more(), reserve_power_of_2(), reserve_more_power_of_2()
Various SurfaceCollecion::filter_xxx() modified to accept an initializer list of surface types.
New bridges detector refactored to accept overhang boundaries.
BoundingBoxWrapper was moved from RetractCrossingPerimeters to AABBTreeIndirect.
1) New region expansion code to propagate wave from a boundary
of a region inside of it.
2) get_extents() extended with a template attribute to work with
zero area data sets.
3) ClipperZUtils.hpp for handling Clipper operation with Z coordinate
(for source contour identification)
