refactored the new floorplan

new helper methods/operator toe geo classes

geo/BBox3.h

@@ -18,8 +18,12 @@ private:
 
 public:
 
+        /** empty ctor */
 	BBox3() : p1(MAX,MAX,MAX), p2(MIN,MIN,MIN) {;}
 
+        /** ctor with min and max */
+        BBox3(const Point3 min, const Point3 max) : p1(min), p2(max) {;}
+
 	/** adjust the bounding-box by adding this point */
 	void add(const Point3& p) {
 
@@ -71,6 +75,12 @@ public:
 		p2 += p;	// increase maximum
 	}
 
+        /** set both, min/max z to the same value */
+        void setZ(const float z) {
+            p1.z = z;
+            p2.z = z;
+        }
+
 	/** does the bbox contain the given point? */
 	bool contains(const Point3& p) const {
 		if (p.x < p1.x) {return false;}