added floorplan support for object-sizing

added floorplan support for different wall-heights
minor fixes/changes

geo/Triangle3.h

@@ -47,6 +47,14 @@ public:
 		return *this;
 	}
 
+	/** scale using 3 individual components */
+	Triangle3& operator *= (const Point3 o) {
+		p1 *= o;
+		p2 *= o;
+		p3 *= o;
+		return *this;
+	}
+
 	Point3 getNormal() const {
 		return cross( p2-p1, p3-p1 ).normalized();
 	}