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New ClipperUtils functions: opening(), closing() as an alternative

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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.
This commit is contained in:
Vojtech Bubnik 2021-10-14 09:11:19 +02:00
parent 2f9ce6bedb
commit 7ff76d0768
19 changed files with 480 additions and 354 deletions
Download patch file Download diff file Expand all files Collapse all files

24
src/libslic3r/PrintObject.cpp
View file

@ -774,7 +774,7 @@ void PrintObject::detect_surfaces_type()
ExPolygons upper_slices = interface_shells ?
diff_ex(layerm->slices.surfaces, upper_layer->m_regions[region_id]->slices.surfaces, ApplySafetyOffset::Yes) :
diff_ex(layerm->slices.surfaces, upper_layer->lslices, ApplySafetyOffset::Yes);
surfaces_append(top, offset2_ex(upper_slices, -offset, offset), stTop);
surfaces_append(top, opening_ex(upper_slices, offset), stTop);
} else {
// if no upper layer, all surfaces of this one are solid
// we clone surfaces because we're going to clear the slices collection
@ -792,15 +792,15 @@ void PrintObject::detect_surfaces_type()
to_polygons(lower_layer->get_region(region_id)->slices.surfaces) :
to_polygons(lower_layer->slices);
surfaces_append(bottom,
offset2_ex(diff(layerm->slices.surfaces, lower_slices, true), -offset, offset),
opening_ex(diff(layerm->slices.surfaces, lower_slices, true), offset),
surface_type_bottom_other);
#else
// Any surface lying on the void is a true bottom bridge (an overhang)
surfaces_append(
bottom,
offset2_ex(
opening_ex(
diff_ex(layerm->slices.surfaces, lower_layer->lslices, ApplySafetyOffset::Yes),
-offset, offset),
offset),
surface_type_bottom_other);
// if user requested internal shells, we need to identify surfaces
// lying on other slices not belonging to this region
@ -809,12 +809,12 @@ void PrintObject::detect_surfaces_type()
// on something else, excluding those lying on our own region
surfaces_append(
bottom,
offset2_ex(
opening_ex(
diff_ex(
intersection(layerm->slices.surfaces, lower_layer->lslices), // supported
lower_layer->m_regions[region_id]->slices.surfaces,
ApplySafetyOffset::Yes),
-offset, offset),
offset),
stBottom);
}
#endif
@ -1337,7 +1337,7 @@ void 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, ClipperLib::jtMiter, 5.), true);
Polygons too_narrow = diff(shell, opening(shell, 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
@ -1453,7 +1453,7 @@ void PrintObject::bridge_over_infill()
// The gaps will be filled by a separate region, which makes the infill less stable and it takes longer.
{
float min_width = float(bridge_flow.scaled_width()) * 3.f;
to_bridge_pp = offset2(to_bridge_pp, -min_width, +min_width);
to_bridge_pp = opening(to_bridge_pp, min_width);
}
if (to_bridge_pp.empty()) continue;
@ -1744,7 +1744,7 @@ void PrintObject::clip_fill_surfaces()
for (const LayerRegion *layerm : layer->m_regions)
pw = std::min(pw, (float)layerm->flow(frPerimeter).scaled_width());
// Append such thick perimeters to the areas that need support
polygons_append(overhangs, offset2(perimeters, -pw, +pw));
polygons_append(overhangs, opening(perimeters, pw));
}
// Find new internal infill.
polygons_append(overhangs, std::move(upper_internal));
@ -1884,7 +1884,7 @@ void PrintObject::discover_horizontal_shells()
float margin = float(neighbor_layerm->flow(frExternalPerimeter).scaled_width());
Polygons too_narrow = diff(
new_internal_solid,
offset2(new_internal_solid, -margin, +margin + ClipperSafetyOffset, jtMiter, 5));
opening(new_internal_solid, margin, margin + ClipperSafetyOffset, jtMiter, 5));
// Trim the regularized region by the original region.
if (! too_narrow.empty())
new_internal_solid = solid = diff(new_internal_solid, too_narrow);
@ -1903,7 +1903,7 @@ void PrintObject::discover_horizontal_shells()
// have the same angle, so the next shell would be grown even more and so on.
Polygons too_narrow = diff(
new_internal_solid,
offset2(new_internal_solid, -margin, +margin + ClipperSafetyOffset, ClipperLib::jtMiter, 5));
opening(new_internal_solid, margin, margin + ClipperSafetyOffset, ClipperLib::jtMiter, 5));
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
@ -1915,7 +1915,7 @@ void PrintObject::discover_horizontal_shells()
polygons_append(internal, to_polygons(surface.expolygon));
polygons_append(new_internal_solid,
intersection(
offset(too_narrow, +margin),
expand(too_narrow, +margin),
// Discard bridges as they are grown for anchoring and we can't
// remove such anchors. (This may happen when a bridge is being
// anchored onto a wall where little space remains after the bridge