worked on floorplan (v2)

worked on grid-generation (v2)
new helper methods for geometry
new test cases

math/Math.h

@@ -2,6 +2,7 @@
 #define K_MATH_MATH_H
 
 #include "../Defines.h"
+#include "../geo/Point3.h"
 
 class Math {
 
@@ -14,6 +15,20 @@ public:
 		return val;
 	}
 
+	/** get the cross-product of u and v */
+	static inline Point3 cross(const Point3 u, const Point3 v) {
+		float x = u.y*v.z - u.z*v.y;
+		float y = u.z*v.x - u.x*v.z;
+		float z = u.x*v.y - u.y*v.x;
+		return Point3(x,y,z);
+	}
+
+	/** get the normal-vector for u and v */
+	static inline Point3 normal(const Point3 u, const Point3 v) {
+		const Point3 p = cross(u,v);
+		return p/p.length();
+	}
+
 };