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SPE-2194: Improve filtering of projected colors in multi-material segmentation.

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Lukáš Hejl 2025-01-31 02:48:01 +01:00 committed by Lukas Matena
parent c044b310ee
commit 36f64d9dd7
1 changed files with 72 additions and 13 deletions
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85
src/libslic3r/MultiMaterialSegmentation.cpp
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@ -1351,6 +1351,68 @@ static uint8_t get_color_of_first_polygon_line(const ColorProjectionLines &color
}
}
// Helper function to find the dominant color in a map.
static std::optional<uint8_t> get_dominant_color_from_map(const std::unordered_map<uint8_t, double> &area_per_color)
{
if (area_per_color.empty())
return std::nullopt;
return std::max_element(area_per_color.begin(), area_per_color.end(),
[](const std::pair<uint8_t, double> &p1, const std::pair<uint8_t, double> &p2) {
return p1.second < p2.second;
})->first;
}
// Function to find the dominant color over the beginning of the ColorProjectionLine.
static std::optional<uint8_t> find_dominant_color_from_begin(const ColorProjectionLine &color_line)
{
assert(!color_line.color_changes.empty());
const ColorChanges &color_changes = color_line.color_changes;
const double line_length = (color_line.b - color_line.a).cast<double>().norm();
const double max_snap_distance = std::min(line_length, 10. * MM_SEGMENTATION_MAX_SNAP_DISTANCE_SCALED);
bool max_snap_distance_exceeded = false;
std::unordered_map<uint8_t, double> area_per_color;
for (auto curr_it = std::next(color_changes.cbegin()); curr_it != color_changes.cend(); ++curr_it) {
auto prev_it = std::prev(curr_it);
if (const double endpoint_dist = curr_it->t * line_length; endpoint_dist < max_snap_distance) {
area_per_color[prev_it->color_next] += (curr_it->t - prev_it->t) * line_length;
} else {
area_per_color[prev_it->color_next] += max_snap_distance - prev_it->t * line_length;
max_snap_distance_exceeded = true;
break;
}
}
if (!max_snap_distance_exceeded) {
const ColorChange &last_color_change = color_changes.back();
area_per_color[last_color_change.color_next] += max_snap_distance - last_color_change.t * line_length;
}
return get_dominant_color_from_map(area_per_color);
}
// Function to find the dominant color over the end of the ColorProjectionLine.
std::optional<uint8_t> find_dominant_color_from_end(const ColorProjectionLine &color_line)
{
const ColorChanges &color_changes = color_line.color_changes;
const double line_length = (color_line.b - color_line.a).cast<double>().norm();
const double max_snap_distance = std::min(line_length, 10. * MM_SEGMENTATION_MAX_SNAP_DISTANCE_SCALED);
double prev_t = 1.;
std::unordered_map<uint8_t, double> area_per_color;
for (auto curr_it = color_changes.crbegin(); curr_it != color_changes.crend(); ++curr_it) {
if (const double endpoint_dist = (1. - curr_it->t) * line_length; endpoint_dist < max_snap_distance) {
area_per_color[curr_it->color_next] += (prev_t - curr_it->t) * line_length;
} else {
area_per_color[curr_it->color_next] += max_snap_distance - (1. - prev_t) * line_length;
break;
}
prev_t = curr_it->t;
}
return get_dominant_color_from_map(area_per_color);
}
static void filter_projected_color_points_on_polygons(std::vector<ColorProjectionLines> &color_polygons_projection_lines) {
for (ColorProjectionLines &color_polygon_projection_lines : color_polygons_projection_lines) {
for (ColorProjectionLine &color_line : color_polygon_projection_lines) {
@ -1373,13 +1435,11 @@ static void filter_projected_color_points_on_polygons(std::vector<ColorProjectio
if (snap_candidates.size() == 1) {
snap_candidates.front()->t = 0.;
} else if (snap_candidates.size() > 1) {
} else if (const std::optional<uint8_t> dominant_color_from_begin = find_dominant_color_from_begin(color_line); snap_candidates.size() > 1 && dominant_color_from_begin.has_value()) {
ColorChange &first_candidate = *snap_candidates.front();
ColorChange &last_candidate = *snap_candidates.back();
first_candidate.t = 0.;
for (auto cr_it = std::next(snap_candidates.begin()); cr_it != snap_candidates.end(); ++cr_it) {
(*cr_it)->color_next = last_candidate.color_next;
first_candidate.t = 0.;
for (ColorChange *snap_candidate : snap_candidates) {
snap_candidate->color_next = *dominant_color_from_begin;
}
}
@ -1395,14 +1455,13 @@ static void filter_projected_color_points_on_polygons(std::vector<ColorProjectio
}
}
while (snap_candidates.size() > 1) {
snap_candidates.pop_back();
color_line.color_changes.pop_back();
}
if (const std::optional<uint8_t> dominant_color_from_end = find_dominant_color_from_end(color_line); !snap_candidates.empty() && dominant_color_from_end.has_value()) {
for (ColorChange *snap_candidate : snap_candidates) {
snap_candidate->color_next = *dominant_color_from_end;
}
if (!snap_candidates.empty()) {
assert(snap_candidates.size() == 1);
snap_candidates.back()->t = 1.;
// Be aware that snap_candidates are sorted in the opposite order to color_line.color_changes.
color_line.color_changes.back().t = 1.;
}
// Remove color ranges that just repeating the same color.