3DPrinting/PrusaSlicer-NonPlainar
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Added a spatial index to speed up alignment score calculation.

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This commit is contained in:
tamasmeszaros 2018-08-03 12:37:27 +02:00
parent 8e516bc3e4
commit e7e212cb52
1 changed files with 60 additions and 34 deletions
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90
xs/src/libslic3r/ModelArrange.hpp
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@ -8,6 +8,8 @@
#include <numeric>
#include <ClipperUtils.hpp>
#include <boost/geometry/index/rtree.hpp>
namespace Slic3r {
namespace arr {
@ -93,6 +95,11 @@ void toSVG(SVG& svg, const Model& model) {
}
}
namespace bgi = boost::geometry::index;
using SpatElement = std::pair<Box, unsigned>;
using SpatIndex = bgi::rtree< SpatElement, bgi::rstar<16, 4> >;
std::tuple<double /*score*/, Box /*farthest point from bin center*/>
objfunc(const PointImpl& bincenter,
double /*bin_area*/,
@ -100,7 +107,9 @@ objfunc(const PointImpl& bincenter,
double /*pile_area*/,
const Item &item,
double norm, // A norming factor for physical dimensions
std::vector<double>& areacache
std::vector<double>& areacache, // pile item areas will be cached
// a spatial index to quickly get neighbors of the candidate item
SpatIndex& spatindex
)
{
using pl = PointLike;
@ -111,18 +120,23 @@ objfunc(const PointImpl& bincenter,
static const double DENSITY_RATIO = 1.0 - ROUNDNESS_RATIO;
// We will treat big items (compared to the print bed) differently
NfpPlacer::Pile bigs;
bigs.reserve(pile.size());
if(pile.size() < areacache.size()) areacache.clear();
auto normarea = [norm](double area) { return std::sqrt(area)/norm; };
// If a new bin has been created:
if(pile.size() < areacache.size()) {
areacache.clear();
spatindex.clear();
}
// We must fill the caches:
int idx = 0;
for(auto& p : pile) {
if(idx == areacache.size()) areacache.emplace_back(sl::area(p));
if(idx == areacache.size()) {
areacache.emplace_back(sl::area(p));
if(normarea(areacache[idx]) > BIG_ITEM_TRESHOLD)
bigs.emplace_back(p);
spatindex.insert({sl::boundingBox(p), idx});
}
idx++;
}
@ -136,25 +150,26 @@ objfunc(const PointImpl& bincenter,
// The bounding box of the big items (they will accumulate in the center
// of the pile
auto bigbb = bigs.empty()? fullbb : ShapeLike::boundingBox(bigs);
Box bigbb;
if(spatindex.empty()) bigbb = fullbb;
else {
auto boostbb = spatindex.bounds();
boost::geometry::convert(boostbb, bigbb);
}
// The size indicator of the candidate item. This is not the area,
// but almost...
double item_normarea = normarea(item.area());
// Will hold the resulting score
double score = 0;
double item_normarea = normarea(item.area());
if(item_normarea > BIG_ITEM_TRESHOLD) {
// This branch is for the bigger items..
// Here we will use the closest point of the item bounding box to
// the already arranged pile. So not the bb center nor the a choosen
// corner but whichever is the closest to the center. This will
// prevent unwanted strange arrangements.
// Now the distance of the gravity center will be calculated to the
// five anchor points and the smallest will be chosen.
// prevent some unwanted strange arrangements.
auto minc = ibb.minCorner(); // bottom left corner
auto maxc = ibb.maxCorner(); // top right corner
@ -163,7 +178,7 @@ objfunc(const PointImpl& bincenter,
auto top_left = PointImpl{getX(minc), getY(maxc)};
auto bottom_right = PointImpl{getX(maxc), getY(minc)};
// Now the distnce of the gravity center will be calculated to the
// Now the distance of the gravity center will be calculated to the
// five anchor points and the smallest will be chosen.
std::array<double, 5> dists;
auto cc = fullbb.center(); // The gravity center
@ -173,35 +188,45 @@ objfunc(const PointImpl& bincenter,
dists[3] = pl::distance(top_left, cc);
dists[4] = pl::distance(bottom_right, cc);
// The smalles distance from the arranged pile center:
auto dist = *(std::min_element(dists.begin(), dists.end())) / norm;
// Density is the pack density: how big is the arranged pile
auto density = std::sqrt(fullbb.width()*fullbb.height()) / norm;
// Prepare a variable for the alignment score.
// This will indicate: how well is the candidate item aligned with
// its neighbors. We will check the aligment with all neighbors and
// return the score for the best alignment. So it is enough for the
// candidate to be aligned with only one item.
auto alignment_score = std::numeric_limits<double>::max();
auto& trsh = item.transformedShape();
idx = 0;
for(auto& p : pile) {
auto querybb = item.boundingBox();
// Query the spatial index for the neigbours
std::vector<SpatElement> result;
spatindex.query(bgi::intersects(querybb), std::back_inserter(result));
for(auto& e : result) { // now get the score for the best alignment
auto idx = e.second;
auto& p = pile[idx];
auto parea = areacache[idx];
if(normarea(areacache[idx]) > BIG_ITEM_TRESHOLD) {
auto chull = sl::convexHull(sl::Shapes<PolygonImpl>{p, trsh});
auto carea = sl::area(chull);
auto ascore = carea - (item.area() + parea);
ascore = std::sqrt(ascore) / norm;
auto bb = sl::boundingBox(sl::Shapes<PolygonImpl>{p, trsh});
auto bbarea = bb.area();
auto ascore = 1.0 - (item.area() + parea)/bbarea;
if(ascore < alignment_score) alignment_score = ascore;
}
idx++;
}
// The final mix of the score is the balance between the distance
// from the full pile center, the pack density and the
// alignment with the neigbours
auto C = 0.33;
score = C * dist + C * density + C * alignment_score;
} else if( item_normarea < BIG_ITEM_TRESHOLD && bigs.empty()) {
} else if( item_normarea < BIG_ITEM_TRESHOLD && spatindex.empty()) {
// If there are no big items, only small, we should consider the
// density here as well to not get silly results
auto bindist = pl::distance(ibb.center(), bincenter) / norm;
@ -234,7 +259,7 @@ void fillConfig(PConf& pcfg) {
// The accuracy of optimization.
// Goes from 0.0 to 1.0 and scales performance as well
pcfg.accuracy = 0.5f;
pcfg.accuracy = 0.6f;
}
template<class TBin>
@ -254,6 +279,7 @@ protected:
PConfig pconf_; // Placement configuration
double bin_area_;
std::vector<double> areacache_;
SpatIndex rtree_;
public:
_ArrBase(const TBin& bin, Distance dist,
@ -286,7 +312,7 @@ public:
double /*penality*/) {
auto result = objfunc(bin.center(), bin_area_, pile,
pile_area, item, norm, areacache_);
pile_area, item, norm, areacache_, rtree_);
double score = std::get<0>(result);
auto& fullbb = std::get<1>(result);
@ -318,7 +344,7 @@ public:
auto binbb = ShapeLike::boundingBox(bin);
auto result = objfunc(binbb.center(), bin_area_, pile,
pile_area, item, norm, areacache_);
pile_area, item, norm, areacache_, rtree_);
double score = std::get<0>(result);
pile.emplace_back(item.transformedShape());
@ -352,7 +378,7 @@ public:
double /*penality*/) {
auto result = objfunc({0, 0}, 0, pile, pile_area,
item, norm, areacache_);
item, norm, areacache_, rtree_);
return std::get<0>(result);
};
@ -530,7 +556,7 @@ bool arrange(Model &model, coordf_t min_obj_distance,
auto ctour = Slic3rMultiPoint_to_ClipperPath(bed);
P irrbed = ShapeLike::create<PolygonImpl>(std::move(ctour));
std::cout << ShapeLike::toString(irrbed) << std::endl;
// std::cout << ShapeLike::toString(irrbed) << std::endl;
AutoArranger<P> arrange(irrbed, min_obj_distance, progressind);