new geo functions

changed the walkers
added moving average
fixed the interpolator
new test-cases

geo/Point3.h

@@ -3,6 +3,7 @@
 
 #include "../Assertions.h"
 #include <cmath>
+#include "Point2.h"
 
 /**
  * 3D Point
@@ -29,6 +30,7 @@ struct Point3 {
 
 	Point3 operator / (const float v) const {return Point3(x/v, y/v, z/v);}
 
+
 	Point3& operator *= (const float v) {x*=v; y*=v; z*=v; return *this;}
 
 	Point3& operator /= (const float v) {x/=v; y/=v; z/=v; return *this;}
@@ -37,8 +39,11 @@ struct Point3 {
 
 	Point3& operator -= (const Point3& o) {x-=o.x; y-=o.y; z-=o.z; return *this;}
 
+
 	bool operator == (const Point3& o) const {return x==o.x && y==o.y && z==o.z;}
 
+	Point2 xy() const {return Point2(x,y);}
+
 	/** read-only array access */
 	float operator [] (const int idx) const {
 		Assert::isBetween(idx, 0, 2, "index out of bounds");