Fix for normal averaging and hidden parameter for max normal Z angle.

src/libslic3r/SLA/SLASupportTree.hpp

@@ -67,6 +67,10 @@ struct SupportConfig {
     // The elevation in Z direction upwards. This is the space between the pad
     // and the model object's bounding box bottom.
     double object_elevation_mm = 10;
+
+    // The max Z angle for a normal at which it will get completely ignored.
+    double normal_cutoff_angle = 110.0 * M_PI / 180.0;
+
 };
 
 struct PoolConfig;