geometry changes/fixes/new features

new grid walkers + fixes
new test-cases
worked on step/and turn detection
android offline-data-reader
worked on vap-grouping

grid/factory/v2/Stairs.h

@@ -22,6 +22,9 @@ private:
 	/** calculation helper */
 	Helper<T> helper;
 
+	// keep a list of all vertices below stairwells and remove them hereafter
+	std::vector<T*> toDelete;
+
 
 	std::ofstream outStairs;
 	std::ofstream outDelete;
@@ -77,6 +80,7 @@ public:
 	}
 
 	~Stairs() {
+		finalize();
 		outStairs.close();
 		outDelete.close();
 	}
@@ -201,10 +205,6 @@ public:
 		}
 
 
-		// keep a list of all vertices below stairwells and remove them hereafter
-		std::vector<T*> toDelete;
-
-
 		// add all stair nodes or replace them with already existing ones
 		for (Intermediate& iNode : stairNodes) {
 
@@ -288,13 +288,23 @@ public:
 			}
 		}
 
-		// delete all pending nodes and perform a cleanup
-		for (T* n : toDelete) {grid.remove(*n);}
-		grid.cleanup();
+		// finalize after ALL stairs were added. much faster and should be safe!
+		//finalize();
 
 
 	}
 
+	void finalize() {
+
+		// delete all pending nodes and perform a cleanup
+		if (!toDelete.empty()) {
+			for (T* n : toDelete) {grid.remove(*n);}
+			toDelete.clear();
+			grid.cleanup();
+		}
+
+	}
+
 	static float minZ(const std::vector<XYZ>& points) {
 		auto comp = [] (const XYZ& a, const XYZ& b) {return a.z < b.z;};
 		auto it = std::min_element(points.begin(), points.end(), comp);