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Improvement of region classification numerical stability.

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The Clipper library is not stable when calcuating offsets of contours
with holes. Replaced a single call of offset2 with offset_ex(offset_ex()).
This is not the most efficient solution, but it fixes this problem.
Fixes https://github.com/prusa3d/Slic3r/issues/456
This commit is contained in:
bubnikv 2017-12-14 13:26:44 +01:00
parent eaaac8b2a4
commit d65835f89b
1 changed files with 2 additions and 1 deletions
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3
xs/src/libslic3r/PrintObject.cpp
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@ -447,7 +447,8 @@ void PrintObject::detect_surfaces_type()
to_polygons(upper_layer->get_region(idx_region)->slices.surfaces) : to_polygons(upper_layer->get_region(idx_region)->slices.surfaces) :
to_polygons(upper_layer->slices); to_polygons(upper_layer->slices);
surfaces_append(top, surfaces_append(top,
offset2_ex(diff(layerm_slices_surfaces, upper_slices, true), -offset, offset), //FIXME implement offset2_ex working over ExPolygons, that should be a bit more efficient than calling offset_ex twice.
offset_ex(offset_ex(diff_ex(layerm_slices_surfaces, upper_slices, true), -offset), offset),
stTop); stTop);
} else { } else {
// if no upper layer, all surfaces of this one are solid // if no upper layer, all surfaces of this one are solid