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.
- Separate the 3 bands -- dangling, sloping and full overhanging -- regions and handle them with different support force deficits.
- Use a heuristic for overhanging edges to increase the number of support points generated for them
- Try to make overhangs and slopes deficit depend on stable area.
enumerate is unusual and would only work effectively with random access iterators
this for_each takes advantage of tbb blocked_range
replace ccr_::enumerate with flexible for_each
enumerate is unusual and would only work effectively with random access iterators
this for_each takes advantage of tbb blocked_range
