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SLA auto supports: Improved distribution of the support forces

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in the up direction by taking into account island overlap areas.
This commit is contained in:
bubnikv 2019-02-20 10:46:49 +01:00
parent 023b788777
commit 5499bbd1da
2 changed files with 54 additions and 34 deletions
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37
src/libslic3r/SLA/SLAAutoSupports.cpp
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@ -146,11 +146,13 @@ static std::vector<SLAAutoSupports::MyLayer> make_layers(
const float between_layers_offset = float(scale_(layer_height / std::tan(safe_angle)));
//FIXME This has a quadratic time complexity, it will be excessively slow for many tiny islands.
for (SLAAutoSupports::Structure &top : layer_above.islands) {
for (SLAAutoSupports::Structure &bottom : layer_below.islands)
if (top.overlaps(bottom)) {
top.islands_below.emplace_back(&bottom);
bottom.islands_above.emplace_back(&top);
for (SLAAutoSupports::Structure &bottom : layer_below.islands) {
float overlap_area = top.overlap_area(bottom);
if (overlap_area > 0) {
top.islands_below.emplace_back(&bottom, overlap_area);
bottom.islands_above.emplace_back(&top, overlap_area);
}
}
if (! top.islands_below.empty()) {
Polygons top_polygons = to_polygons(*top.polygon);
Polygons bottom_polygons = top.polygons_below();
@ -202,26 +204,27 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
support_force_bottom[i] = layer_bottom->islands[i].supports_force_total();
}
for (Structure &top : layer_top->islands)
for (Structure *bottom : top.islands_below) {
float centroids_dist = (bottom->centroid - top.centroid).norm();
for (Structure::Link &bottom_link : top.islands_below) {
Structure &bottom = *bottom_link.island;
float centroids_dist = (bottom.centroid - top.centroid).norm();
// Penalization resulting from centroid offset:
// bottom.supports_force *= std::min(1.f, 1.f - std::min(1.f, (1600.f * layer_height) * centroids_dist * centroids_dist / bottom.area));
float &support_force = support_force_bottom[bottom - layer_bottom->islands.data()];
float &support_force = support_force_bottom[&bottom - layer_bottom->islands.data()];
//FIXME this condition does not reflect a bifurcation into a one large island and one tiny island well, it incorrectly resets the support force to zero.
// One should rather work with the overlap area vs overhang area.
// support_force *= std::min(1.f, 1.f - std::min(1.f, 0.1f * centroids_dist * centroids_dist / bottom->area));
// support_force *= std::min(1.f, 1.f - std::min(1.f, 0.1f * centroids_dist * centroids_dist / bottom.area));
// Penalization resulting from increasing polygon area:
support_force *= std::min(1.f, 20.f * bottom->area / top.area);
support_force *= std::min(1.f, 20.f * bottom.area / top.area);
}
// Let's assign proper support force to each of them:
if (layer_id > 0) {
for (Structure &below : layer_bottom->islands) {
float below_support_force = support_force_bottom[&below - layer_bottom->islands.data()];
float above_area = 0.f;
for (Structure *above : below.islands_above)
above_area += above->area;
for (Structure *above : below.islands_above)
above->supports_force_inherited += below_support_force * above->area / above_area;
float above_overlap_area = 0.f;
for (Structure::Link &above_link : below.islands_above)
above_overlap_area += above_link.overlap_area;
for (Structure::Link &above_link : below.islands_above)
above_link.island->supports_force_inherited += below_support_force * above_link.overlap_area / above_overlap_area;
}
}
// Now iterate over all polygons and append new points if needed.
@ -231,9 +234,9 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
s.supports_force_inherited /= std::max(1.f, 0.17f * (s.overhangs_area) / s.area);
float force_deficit = s.support_force_deficit(m_config.tear_pressure);
if (s.islands_below.empty()) // completely new island - needs support no doubt
if (s.islands_below.empty()) { // completely new island - needs support no doubt
uniformly_cover({ *s.polygon }, s, point_grid, true);
else if (! s.dangling_areas.empty()) {
} else if (! s.dangling_areas.empty()) {
// Let's see if there's anything that overlaps enough to need supports:
// What we now have in polygons needs support, regardless of what the forces are, so we can add them.
//FIXME is it an island point or not? Vojtech thinks it is.
@ -474,7 +477,7 @@ void SLAAutoSupports::uniformly_cover(const ExPolygons& islands, Structure& stru
#ifdef SLA_AUTOSUPPORTS_DEBUG
{
static int irun = 0;
Slic3r::SVG svg(debug_out_path("SLA_supports-uniformly_cover-%d.svg", irun ++), get_extents(island));
Slic3r::SVG svg(debug_out_path("SLA_supports-uniformly_cover-%d.svg", irun ++), get_extents(islands));
for (const ExPolygon &island : islands)
svg.draw(island);
for (const Vec2f &pt : raw_samples)