added some sanity checks

wifi/estimate/ray3/ModelFactory.h

@@ -339,6 +339,13 @@ namespace Ray3D {
 
 			const std::string& name = foo->file;
 			Obstacle3D obs = OBJPool::get().getObject(name);
+
+			// perform sanity checks
+			if (!obs.isValid()) {
+				throw std::runtime_error("invalid obstacle-data detected");
+			}
+
+			// apply scaling/rotation/translation
 			obs = obs.scaled(foo->scale);
 			obs = obs.rotated_deg( Point3(foo->rot.x, foo->rot.y, foo->rot.z) );
 			obs = obs.translated(foo->pos + Point3(0,0,fpos.z1));

wifi/estimate/ray3/Obstacle3.h

@@ -89,6 +89,14 @@ namespace Ray3D {
 			return res;
 		}
 
+		/** perform sanity checks */
+		bool isValid() const {
+			for (const Triangle3& t : triangles) {
+				if (!t.isValid()) {return false;}
+			}
+			return true;
+		}
+
 	};
 
 }