diff --git a/geotypes.cpp b/geotypes.cpp
index 79f0f7b..8bd60f1 100644
--- a/geotypes.cpp
+++ b/geotypes.cpp
@@ -51,7 +51,7 @@ bool Sphere::collision(const Box & b) const {
 }
 
 bool Sphere::collision(const Plane &p) const {
-	return true;
+	return p.dist(pos) <= radius;
 }
 
 bool Sphere::inSphere(Punkt3D p) const {
@@ -263,6 +263,22 @@ bool Plane::collision(const Plane &p) const {
 	return true;
 }
 
+bool Plane::onPlane(const Punkt3D &p) const {
+	return dist(p) == 0.0f;
+}
+
+bool Plane::getIntersectionPoint(const Ray &r, Punkt3D *p) const {
+	if(r.dir.calcAngle(norm) && !onPlane(r.pos))
+		return false;
+	
+	if(!p)
+		return true;
+	
+	float param = (pos*norm - r.pos*norm) / (r.dir*norm);
+	*p = r.get(param);
+	return true;
+}
+
 float Plane::dist(Punkt3D p) const {
 	return 0.0f;
 }
diff --git a/geotypes.h b/geotypes.h
index c2037fd..fd6bb42 100644
--- a/geotypes.h
+++ b/geotypes.h
@@ -103,6 +103,8 @@ class Plane {
 		bool collision(const Box & b) const;
 		bool collision(const Plane &p) const;
 		
+		bool onPlane(const Punkt3D &p) const;
+		bool getIntersectionPoint(const Ray &r, Punkt3D *p) const;
 		float dist(Punkt3D p) const;
 };