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CLIPPER_OFFSET_SCALE was made a power of two, the scaling functions

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inside ClipperUtils are now using bit shifts instead of multiplication
by doubles, which makes the scaling precise.

Removed the scale parameter from all offset functions.

Modified the safety offset to calculate offset per polygon instead
of over all polygons at once. The old way was not safe and very slow,
sometimes this meant a kiss of death for supports for example.
This commit is contained in:
bubnikv 2016-11-28 17:33:17 +01:00
parent e93253e270
commit 695c92fb00
14 changed files with 214 additions and 152 deletions
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5
xs/src/libslic3r/PrintObject.cpp
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@ -692,8 +692,7 @@ PrintObject::discover_vertical_shells()
#if 1
// Intentionally inflate a bit more than how much the region has been shrunk,
// so there will be some overlap between this solid infill and the other infill regions (mainly the sparse infill).
shell = offset2(shell, - 0.5f * min_perimeter_infill_spacing, 0.8f * min_perimeter_infill_spacing,
CLIPPER_OFFSET_SCALE, ClipperLib::jtSquare);
shell = offset2(shell, - 0.5f * min_perimeter_infill_spacing, 0.8f * min_perimeter_infill_spacing, ClipperLib::jtSquare);
if (shell.empty())
continue;
#else
@ -705,7 +704,7 @@ PrintObject::discover_vertical_shells()
// get a triangle in $too_narrow; if we grow it below then the shell
// would have a different shape from the external surface and we'd still
// have the same angle, so the next shell would be grown even more and so on.
Polygons too_narrow = diff(shell, offset2(shell, -margin, margin, CLIPPER_OFFSET_SCALE, ClipperLib::jtMiter, 5.), true);
Polygons too_narrow = diff(shell, offset2(shell, -margin, margin, ClipperLib::jtMiter, 5.), true);
if (! too_narrow.empty()) {
// grow the collapsing parts and add the extra area to the neighbor layer
// as well as to our original surfaces so that we support this