diff --git a/geotypes.cpp b/geotypes.cpp
index 26451a0..bb08484 100644
--- a/geotypes.cpp
+++ b/geotypes.cpp
@@ -75,6 +75,11 @@ void Ray::set(Punkt3D _pos, Punkt3D _dir) {
 	dir = _dir;
 }
 
+void Ray::setFromPoints(Punkt3D a, Punkt3D b) {
+	pos = a;
+	dir = b - a;
+}
+
 Punkt3D Ray::get(float x) {
 	return pos + dir*x;
 }
diff --git a/geotypes.h b/geotypes.h
index 555e028..a00d275 100644
--- a/geotypes.h
+++ b/geotypes.h
@@ -60,6 +60,7 @@ class Ray {
 		Ray(Punkt3D _pos, Punkt3D _dir);
 		
 		void set(Punkt3D _pos, Punkt3D _dir);
+		void setFromPoints(Punkt3D a, Punkt3D b);
 		Punkt3D get(float x);
 		bool onRay(Punkt3D p, int rnd=-1);
 		float dist(Punkt3D p);