worked on grid-walking

worked on grid-generation
added helper library for nav-meshes
started working on nav meshes

navMesh/NavMeshRandom.h

@@ -0,0 +1,49 @@
+#ifndef NAVMESHRANDOM_H
+#define NAVMESHRANDOM_H
+
+#include <random>
+#include <vector>
+#include "../math/DrawList.h"
+#include "../geo/Point3.h"
+
+template <typename Tria> class NavMeshRandom {
+
+	std::minstd_rand gen;
+	std::uniform_real_distribution<float> dOnTriangle = std::uniform_real_distribution<float>(0.0f, 1.0f);
+	const std::vector<Tria>& triangles;
+	DrawList<size_t> lst;
+
+public:
+
+	struct Result {
+		Point3 pos;
+		size_t triaIdx;
+		Result(const Point3 pos, const size_t triaIdx) : pos(pos), triaIdx(triaIdx) {;}
+	};
+
+	/** ctor */
+	NavMeshRandom(const std::vector<Tria>& triangles) : triangles(triangles) {
+		for (size_t idx = 0; idx < triangles.size(); ++idx) {
+			lst.add(idx, triangles[idx].getArea());
+		}
+	}
+
+	/** draw a random point within the map */
+	Result draw() {
+
+		const size_t idx = lst.get();
+		const Tria& tria = triangles[idx];
+
+		while (true) {
+			const float u = dOnTriangle(gen);
+			const float v = dOnTriangle(gen);
+			if (u+v > 1) {continue;}
+			const Point3 pos = tria.getA() + (tria.getAB() * u) + (tria.getAC() * v);
+			return Result(pos, idx);
+		}
+
+	}
+
+};
+
+#endif // NAVMESHRANDOM_H