Quick Object Placement System - Save & Load System

This package provides a complete inventory-based object placement system designed for structured environment building. It allows users to select items from an interactive UI, spawn them as box objects, preview their placement in real time, and instantiate them into the scene. The system follows a smooth workflow where items are first ordered through the inventory and appear as box objects. Upon interaction, a preview object is activated, allowing precise positioning with real-time visual feedback. The preview uses color states to indicate valid and invalid placement based on surface layers. Once confirmed, the object is instantiated at the selected location. A flexible layer-based validation system ensures logical placement. Furniture can only be placed on furniture surfaces, while sanitary items are restricted to sanitary areas, preventing incorrect placement. A key feature of this package is its saving and loading system. All placed objects, including furniture, sanitary items, and even spawned box objects, are automatically saved with their position and rotation. When the user returns, the scene is restored exactly as it was using Unity JSON-based data storage, ensuring persistence across sessions. The package includes a fully functional and customizable UI system with category selection, item browsing, and a cart-based price panel. Users can add items, view total cost, and complete the placement process efficiently. The system is modular, scalable, and optimized for both PC and mobile platforms, making it suitable for simulation games, house design systems, and interactive environment builders.