Base plate creation improvements. Added sla parameter for support elevation.

src/libslic3r/PrintConfig.hpp

@@ -935,6 +935,10 @@ public:
     // The max length of a bridge in mm
     ConfigOptionFloat support_max_bridge_length /*= 15.0*/;
 
+    // The elevation in Z direction upwards. This is the space between the pad
+    // and the model object's bounding box bottom.
+    ConfigOptionFloat support_object_elevation;
+
     // Now for the base pool (plate) ///////////////////////////////////////////
 
     ConfigOptionFloat pad_wall_thickness /*= 2*/;

src/libslic3r/SLA/SLABasePool.cpp

@@ -418,17 +418,32 @@ ExPolygons concave_hull(const ExPolygons& polys, double max_dist_mm = 50)
     return punion;
 }
 
-void base_plate(const TriangleMesh &mesh, ExPolygons &output, float h)
+void base_plate(const TriangleMesh &mesh, ExPolygons &output, float h,
+                float layerh)
 {
     TriangleMesh m = mesh;
     TriangleMeshSlicer slicer(&m);
 
-    TriangleMesh upper, lower;
-    slicer.cut(h, &upper, &lower);
+//    TriangleMesh upper, lower;
+//    slicer.cut(h, &upper, &lower);
 
-    // TODO: this might be slow
-    output = lower.horizontal_projection();
+    // TODO: this might be slow (in fact it was)
+//    output = lower.horizontal_projection();
 
+    auto bb = mesh.bounding_box();
+    float gnd = float(bb.min(Z));
+    std::vector<float> heights = {float(bb.min(Z))};
+    for(float hi = gnd + layerh; hi <= gnd + h; hi += layerh)
+        heights.emplace_back(hi);
+
+    std::vector<ExPolygons> out; out.reserve(size_t(std::ceil(h/layerh)));
+    slicer.slice(heights, &out, [](){});
+
+    size_t count = 0; for(auto& o : out) count += o.size();
+    ExPolygons tmp; tmp.reserve(count);
+    for(auto& o : out) for(auto& e : o) tmp.emplace_back(std::move(e));
+
+    output = unify(tmp);
     for(auto& o : output) o = o.simplify(0.1/SCALING_FACTOR).front();
 }
 

src/libslic3r/SLA/SLABasePool.hpp

@@ -15,7 +15,8 @@ using ExPolygons = std::vector<ExPolygon>;
 /// Calculate the polygon representing the silhouette from the specified height
 void base_plate(const TriangleMesh& mesh,
                 ExPolygons& output,
-                float height = 0.1f);
+                float zlevel = 0.1f,
+                float layerheight = 0.05f);
 
 struct PoolConfig {
     double min_wall_thickness_mm = 2;

src/libslic3r/SLA/SLASupportTree.cpp

@@ -510,9 +510,9 @@ struct Pad {
         const PoolConfig& cfg) : zlevel(ground_level + cfg.min_wall_height_mm/2)
     {
         ExPolygons basep;
-        base_plate(object_support_mesh, basep);
+        base_plate(object_support_mesh, basep, cfg.min_wall_height_mm/*,layer_height*/);
         for(auto& bp : baseplate) basep.emplace_back(bp);
-        union_ex(basep);
+
         create_base_pool(basep, tmesh, cfg);
         tmesh.translate(0, 0, float(zlevel));
     }
@@ -1275,8 +1275,6 @@ bool SLASupportTree::generate(const PointSet &points,
         ClusterEl cl_centroids;
         cl_centroids.reserve(gnd_clusters.size());
 
-        std::cout << "gnd_clusters size: " << gnd_clusters.size() << std::endl;
-
         SpatIndex pheadindex; // spatial index for the junctions
         for(auto cl : gnd_clusters) {
             // place all the centroid head positions into the index. We will

src/libslic3r/SLAPrint.cpp

@@ -200,9 +200,14 @@ void SLAPrint::process()
             double h =  po.m_config.pad_wall_height.getFloat();
             double md = po.m_config.pad_max_merge_distance.getFloat();
             double er = po.m_config.pad_edge_radius.getFloat();
+            double lh = po.m_config.layer_height.getFloat();
+            double elevation = po.m_config.support_object_elevation.getFloat();
 
             sla::ExPolygons bp;
-            sla::base_plate(po.transformed_mesh(), bp);
+            if(elevation < h/2)
+                sla::base_plate(po.transformed_mesh(), bp,
+                                float(h/2), float(lh));
+
             po.m_supportdata->support_tree_ptr->add_pad(bp, wt, h, md, er);
         }
     };
@@ -387,7 +392,7 @@ void SLAPrint::process()
     };
 
     // this would disable the rasterization step
-    // m_stepmask[slapsRasterize] = false;
+     m_stepmask[slapsRasterize] = false;
 
     for(size_t s = 0; s < print_program.size(); ++s) {
         auto currentstep = printsteps[s];