Wipe tower: changed the way how initial wipe tower preview depth is calculated

src/libslic3r/GCode/WipeTower.cpp

@@ -1328,6 +1328,33 @@ WipeTower::ToolChangeResult WipeTower::finish_layer(bool extrude_perimeter, bool
     return construct_tcr(writer, false, old_tool, true, 0.f);
 }
 
+// Static method to extract wipe_volumes[from][to] from the configuration.
+std::vector<std::vector<float>> WipeTower::extract_wipe_volumes(const PrintConfig& config)
+{
+    // Get wiping matrix to get number of extruders and convert vector<double> to vector<float>:
+    std::vector<float> wiping_matrix(cast<float>(config.flush_volumes_matrix.values));
+    auto scale = config.flush_multiplier;
+
+    // Orca todo: currently we only/always support SEMM.
+    // The values shall only be used when SEMM is enabled. The purging for other printers
+    // is determined by filament_minimal_purge_on_wipe_tower.
+    // if (! config.single_extruder_multi_material.value)
+    //     std::fill(wiping_matrix.begin(), wiping_matrix.end(), 0.f);
+
+    // Extract purging volumes for each extruder pair:
+    std::vector<std::vector<float>> wipe_volumes;
+    const unsigned int number_of_extruders = (unsigned int)(sqrt(wiping_matrix.size())+EPSILON);
+    for (unsigned int i = 0; i<number_of_extruders; ++i)
+        wipe_volumes.push_back(std::vector<float>(wiping_matrix.begin()+i*number_of_extruders, wiping_matrix.begin()+(i+1)*number_of_extruders));
+
+    // Also include filament_minimal_purge_on_wipe_tower. This is needed for the preview.
+    for (unsigned int i = 0; i<number_of_extruders; ++i)
+        for (unsigned int j = 0; j<number_of_extruders; ++j)
+            wipe_volumes[i][j] = std::max<float>(wipe_volumes[i][j] * scale, config.filament_minimal_purge_on_wipe_tower.get_at(j));
+
+    return wipe_volumes;
+}
+
 // Appends a toolchange into m_plan and calculates neccessary depth of the corresponding box
 void WipeTower::plan_toolchange(float z_par, float layer_height_par, unsigned int old_tool,
                                 unsigned int new_tool, float wipe_volume, float purge_volume)

src/libslic3r/GCode/WipeTower.hpp

@@ -25,6 +25,7 @@ public:
 
 	// WipeTower height to minimum depth map
 	static const std::map<float, float> min_depth_per_height;
+	static std::vector<std::vector<float>> extract_wipe_volumes(const PrintConfig& config);
 
     struct Extrusion
     {