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SLA supports - added parameters for the automatic generation (relative density measure and minimal distance of the points)

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Lukas Matena 2019-02-19 16:34:52 +01:00
parent 1bb0af1588
commit eb0fd03861
9 changed files with 54 additions and 59 deletions
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18
src/libslic3r/SLA/SLAAutoSupports.cpp
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@ -230,7 +230,7 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
// s.supports_force_inherited /= std::max(1.f, (layer_height / 0.3f) * e_area / s.area);
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);
float force_deficit = s.support_force_deficit(m_config.tear_pressure());
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()) {
@ -436,16 +436,16 @@ void SLAAutoSupports::uniformly_cover(const ExPolygons& islands, Structure& stru
{
//int num_of_points = std::max(1, (int)((island.area()*pow(SCALING_FACTOR, 2) * m_config.tear_pressure)/m_config.support_force));
const float support_force_deficit = structure.support_force_deficit(m_config.tear_pressure);
const float support_force_deficit = structure.support_force_deficit(m_config.tear_pressure());
if (support_force_deficit < 0)
return;
// Number of newly added points.
const size_t poisson_samples_target = size_t(ceil(support_force_deficit / m_config.support_force));
const size_t poisson_samples_target = size_t(ceil(support_force_deficit / m_config.support_force()));
const float density_horizontal = m_config.tear_pressure / m_config.support_force;
const float density_horizontal = m_config.tear_pressure() / m_config.support_force();
//FIXME why?
float poisson_radius = 1.f / (5.f * density_horizontal);
float poisson_radius = std::max(m_config.minimal_distance, 1.f / (5.f * density_horizontal));
// const float poisson_radius = 1.f / (15.f * density_horizontal);
const float samples_per_mm2 = 30.f / (float(M_PI) * poisson_radius * poisson_radius);
// Minimum distance between samples, in 3D space.
@ -462,13 +462,13 @@ void SLAAutoSupports::uniformly_cover(const ExPolygons& islands, Structure& stru
[&structure, &grid3d, min_spacing](const Vec2f &pos) {
return grid3d.collides_with(pos, &structure, min_spacing);
});
if (poisson_samples.size() >= poisson_samples_target)
if (poisson_samples.size() >= poisson_samples_target || m_config.minimal_distance > poisson_radius-EPSILON)
break;
float coeff = 0.5f;
if (poisson_samples.size() * 2 > poisson_samples_target)
coeff = float(poisson_samples.size()) / float(poisson_samples_target);
poisson_radius *= coeff;
min_spacing *= coeff;
poisson_radius = std::max(m_config.minimal_distance, poisson_radius * coeff);
min_spacing = std::max(m_config.minimal_distance, min_spacing * coeff);
}
#ifdef SLA_AUTOSUPPORTS_DEBUG
@ -491,7 +491,7 @@ void SLAAutoSupports::uniformly_cover(const ExPolygons& islands, Structure& stru
}
for (const Vec2f &pt : poisson_samples) {
m_output.emplace_back(float(pt(0)), float(pt(1)), structure.height, 0.2f, is_new_island);
structure.supports_force_this_layer += m_config.support_force;
structure.supports_force_this_layer += m_config.support_force();
grid3d.insert(pt, &structure);
}
}