Merge branch 'master' of https://github.com/prusa3d/Slic3r

src/libslic3r/SLA/SLASupportTree.cpp

@@ -1466,7 +1466,7 @@ public:
                                   m_cfg.head_back_radius_mm,
                                   w);
 
-                if(t <= w || (hp(Z) + nn(Z) * w) < m_result.ground_level) {
+                if(t <= w) {
 
                     // Let's try to optimize this angle, there might be a
                     // viable normal that doesn't collide with the model
@@ -1509,7 +1509,7 @@ public:
                 // save the verified and corrected normal
                 m_support_nmls.row(fidx) = nn;
 
-                if(t > w && (hp(Z) + nn(Z) * w) > m_result.ground_level) {
+                if(t > w) {
                     // mark the point for needing a head.
                     m_iheads.emplace_back(fidx);
                 } else if( polar >= 3*PI/4 ) {

src/libslic3r/SLAPrint.cpp

@@ -571,7 +571,24 @@ void swapXY(ExPolygon& expoly) {
     for(auto& p : expoly.contour.points) std::swap(p(X), p(Y));
     for(auto& h : expoly.holes) for(auto& p : h.points) std::swap(p(X), p(Y));
 }
+}
 
+std::string SLAPrint::validate() const
+{
+    for(SLAPrintObject * po : m_objects) {
+        sla::SupportConfig cfg = make_support_cfg(po->config());
+
+        double pinhead_width =
+                2 * cfg.head_front_radius_mm +
+                cfg.head_width_mm +
+                2 * cfg.head_back_radius_mm -
+                cfg.head_penetration_mm;
+
+        if(pinhead_width > cfg.object_elevation_mm)
+            return L("Elevetion is too low for object.");
+    }
+
+    return "";
 }
 
 std::vector<float> SLAPrint::calculate_heights(const BoundingBoxf3& bb3d,

src/libslic3r/SLAPrint.hpp

@@ -240,6 +240,8 @@ public:
 
     const SLAPrintStatistics&      print_statistics() const { return m_print_statistics; }
 
+    std::string validate() const override;
+
 private:
     using SLAPrinter = FilePrinter<FilePrinterFormat::SLA_PNGZIP>;
     using SLAPrinterPtr = std::unique_ptr<SLAPrinter>;