worked on 3d models within map

adjusted grid factory
adjusted nav mesh factory
minoor changes/fixes
new helper classes
refactoring

math/stats/Histogram2.h

@@ -0,0 +1,53 @@
+#ifndef HISTOGRAM2_H
+#define HISTOGRAM2_H
+
+#include <vector>
+#include "../../geo/BBox2.h"
+
+namespace Stats {
+
+	/** 2D histogram */
+	template <typename Scalar> class Histogram2 {
+
+		std::vector<Scalar> vec;
+		BBox2 bbox;
+		int binsX;
+		int binsY;
+
+	public:
+
+		/** ctor */
+		Histogram2(BBox2 bbox, int binsX, int binsY) : bbox(bbox), binsX(binsX), binsY(binsY) {
+			vec.resize(binsX*binsY);
+		}
+
+		Scalar get(Scalar x, Scalar y) const {
+			const int idx = binIdx(x,y);
+			return vec[idx];
+		}
+
+		void add(Scalar x, Scalar y, Scalar val) {
+			const int idx = binIdx(x,y);
+			vec[idx] += val;
+		}
+
+		int binIdx(const Scalar x, const Scalar y) {
+			const int ix = binIdxX(x);
+			const int iy = binIdxY(y);
+			return ix + iy*binsX;
+		}
+
+		int binIdxX(const Scalar val) const {
+			return (val - bbox.getMin().x) / (bbox.getSize().x) * binsX;
+		}
+
+		int binIdxY(const Scalar val) const {
+			return (val - bbox.getMin().y) / (bbox.getSize().y) * binsY;
+		}
+
+
+	};
+
+}
+
+#endif // HISTOGRAM2_H