interface layers if possible. This should always be possible with
soluble supports and it should have been done long time ago.
For non-soluble supports, it may or may not be possible to merge
these layers: They will only be merged if they are extruded without
bridging and with the same layer height.
Fixes Support enforcer interfaces not generated as needed. #6784
or at least some of the issues reported.
Experimental: Added experimental filtering of propagated support columns
to two extrusions, overlapping by maximum 20%.
This filtering step will remove spurious columns that do not support
anything, but the filtering step may remove supports supporting tiny
islands. Those supports would likely not be printable anyways without
the user intervention (extending the supported area by painting).
Fixed visualization of G-code in G-code viewer after 07e7e11590
The line end positions were not extracted correctly from G-code
imported into a stand-alone G-code viewer.
flip direction of the infill layer with each interface layer.
Unfortunately the flipping of support interface directions may not work
reliably due to base support layer heights growing at different rate
from the interface layers.
for offset2() with clear meaning.
New ClipperUtils functions: expand(), shrink() as an alternative
for offset() with clear meaning.
All offset values for the new functions are positive.
Various offsetting ClipperUtils (offset, offset2, offset2_ex) working
over Polygons were marked as unsafe, sometimes producing invalid output
if called for more than one polygon. These functions were reworked
to offset polygons one by one. The new functions working over Polygons
shall work the same way as the old safe ones working over ExPolygons,
but working with Polygons shall be computationally more efficient.
Improvements in FDM support generator:
1) For both grid and snug supports: Don't filter out supports for which
the contacts are completely reduced by support / object XY separation.
2) Rounding / merging of supports using the closing radius parameter is
now smoother, it does not produce sharp corners.
3) Snug supports: When calculating support interfaces, expand the projected
support contact areas to produce wider, printable and more stable interfaces.
4) Don't reduce support interfaces for snug supports for steep overhangs,
that would normally not need them. Snug supports often produce very
narrow support interface regions and turning them off makes the support
interfaces disappear.
