Separate methods to get the sliced polygons.

src/libslic3r/SLAPrint.cpp

@@ -438,6 +438,24 @@ SLAPrintObject::SLAPrintObject(SLAPrint *print, ModelObject *model_object):
 
 SLAPrintObject::~SLAPrintObject() {}
 
+double SLAPrintObject::get_elevation() const {
+    return m_supportdata && m_supportdata->support_tree_ptr?
+                m_supportdata->support_tree_ptr->get_elevation() :
+                0;
+}
+
+const std::vector<ExPolygons> &SLAPrintObject::get_support_slices() const
+{
+    if(!m_supportdata) return {};
+
+    return m_supportdata->support_slices;
+}
+
+const std::vector<ExPolygons> &SLAPrintObject::get_model_slices() const
+{
+    return m_model_slices;
+}
+
 TriangleMesh SLAPrintObject::support_mesh() const
 {
     TriangleMesh trm;

src/libslic3r/SLAPrint.hpp

@@ -62,6 +62,15 @@ public:
 
     std::vector<Vec3d>      transformed_support_points() const;
 
+    // Get the needed Z elevation for the model geometry if supports should be
+    // displayed. This Z offset should also be applied to the support
+    // geometries. Note that this is not the same as the value stored in config
+    // as the pad height also needs to be considered.
+    double get_elevation() const;
+
+    const std::vector<ExPolygons>& get_support_slices() const;
+    const std::vector<ExPolygons>& get_model_slices() const;
+
     // I refuse to grantee copying (Tamas)
     SLAPrintObject(const SLAPrintObject&) = delete;
     SLAPrintObject& operator=(const SLAPrintObject&) = delete;