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ENH: improving the efficiency of “groupingVolumesForBrim” 

tbb parallelization is used to improved the efficiency of for_each_volume and for_each_polygon loop

JIRA ID: STUDIO-2866

Change-Id: Id5b3a536e3162b148417cbee803bcede3b62a651
(cherry picked from commit 15a6f7ef2f575eaa4b4694ad357d881b39b82f5b)
This commit is contained in:
wintergua 2023-06-07 16:15:23 +08:00 committed by Lane.Wei
parent 9392e3a9f1
commit d132ad2d9d
1 changed files with 50 additions and 20 deletions
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70
src/libslic3r/PrintObjectSlice.cpp
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@ -486,14 +486,28 @@ bool groupingVolumes(std::vector<VolumeSlices> objSliceByVolume, std::vector<gro
std::vector<int> groupIndex(objSliceByVolume.size(), -1);
double offsetValue = 0.05 / SCALING_FACTOR;
std::vector<std::vector<int>> osvIndex;
for (int i = 0; i != objSliceByVolume.size(); ++i) {
for (int j = 0; j != objSliceByVolume[i].slices.size(); ++j) {
objSliceByVolume[i].slices[j] = offset_ex(objSliceByVolume[i].slices[j], offsetValue);
for (ExPolygon& poly_ex : objSliceByVolume[i].slices[j])
poly_ex.douglas_peucker(resolution);
osvIndex.push_back({ i,j });
}
}
tbb::parallel_for(tbb::blocked_range<int>(0, osvIndex.size()),
[&osvIndex, &objSliceByVolume, &offsetValue, &resolution](const tbb::blocked_range<int>& range) {
for (auto k = range.begin(); k != range.end(); ++k) {
for (ExPolygon& poly_ex : objSliceByVolume[osvIndex[k][0]].slices[osvIndex[k][1]])
poly_ex.douglas_peucker(resolution);
}
});
tbb::parallel_for(tbb::blocked_range<int>(0, osvIndex.size()),
[&osvIndex, &objSliceByVolume,&offsetValue, &resolution](const tbb::blocked_range<int>& range) {
for (auto k = range.begin(); k != range.end(); ++k) {
objSliceByVolume[osvIndex[k][0]].slices[osvIndex[k][1]] = offset_ex(objSliceByVolume[osvIndex[k][0]].slices[osvIndex[k][1]], offsetValue);
}
});
for (int i = 0; i != objSliceByVolume.size(); ++i) {
if (groupIndex[i] < 0) {
groupIndex[i] = i;
@ -578,27 +592,43 @@ void applyNegtiveVolumes(ModelVolumePtrs model_volumes, const std::vector<Volume
}
}
void reGroupingLayerPolygons(std::vector<groupedVolumeSlices>& gvss, ExPolygons eps)
void reGroupingLayerPolygons(std::vector<groupedVolumeSlices>& gvss, ExPolygons &eps, double resolution)
{
std::vector<int> epsIndex;
epsIndex.resize(eps.size(), -1);
for (int ie = 0; ie != eps.size(); ie++) {
if (eps[ie].area() <= 0)
continue;
double minArea = eps[ie].area();
for (int iv = 0; iv != gvss.size(); iv++) {
auto clipedExPolys = diff_ex(eps[ie], gvss[iv].slices);
double area = 0;
for (const auto& ce : clipedExPolys) {
area += ce.area();
}
if (area < minArea) {
minArea = area;
epsIndex[ie] = iv;
}
}
auto gvssc = gvss;
auto epsc = eps;
for (ExPolygon& poly_ex : epsc)
poly_ex.douglas_peucker(resolution);
for (int i = 0; i != gvssc.size(); ++i) {
for (ExPolygon& poly_ex : gvssc[i].slices)
poly_ex.douglas_peucker(resolution);
}
tbb::parallel_for(tbb::blocked_range<int>(0, epsc.size()),
[&epsc, &gvssc, &epsIndex](const tbb::blocked_range<int>& range) {
for (auto ie = range.begin(); ie != range.end(); ++ie) {
if (epsc[ie].area() <= 0)
continue;
double minArea = epsc[ie].area();
for (int iv = 0; iv != gvssc.size(); iv++) {
auto clipedExPolys = diff_ex(epsc[ie], gvssc[iv].slices);
double area = 0;
for (const auto& ce : clipedExPolys) {
area += ce.area();
}
if (area < minArea) {
minArea = area;
epsIndex[ie] = iv;
}
}
}
});
for (int iv = 0; iv != gvss.size(); iv++)
gvss[iv].slices.clear();
@ -734,7 +764,7 @@ void groupingVolumesForBrim(PrintObject* object, LayerPtrs& layers, int firstLay
applyNegtiveVolumes(object->model_object()->volumes, object->firstLayerObjSliceMod(), object->firstLayerObjGroupsMod(), scaled_resolution);
// BBS: the actual first layer slices stored in layers are re-sorted by volume group and will be used to generate brim
reGroupingLayerPolygons(object->firstLayerObjGroupsMod(), layers.front()->lslices);
reGroupingLayerPolygons(object->firstLayerObjGroupsMod(), layers.front()->lslices, scaled_resolution);
}
// Called by make_perimeters()