classroom interior 3d model

You are a professional 3D environment modeler. Using the uploaded image as a strict reference, generate a complete enclosed 3D classroom environment, not individual furniture objects. The classroom must include a full room shell: four walls, floor, and ceiling, forming a closed interior space. The room structure is mandatory and must be created before placing any furniture. After creating the room, place desks, chairs, teacher desk, board (chalkboard or whiteboard), windows, door, and classroom furniture exactly as shown in the reference image. Maintain correct layout, scale, and proportions. Do not generate standalone furniture without the room. Style should be semi-realistic to realistic with clean geometry and human-scale proportions. Avoid stylized or cartoon shapes. Topology must be clean and optimized, with logically separated objects (room shell, desks, chairs, windows). Use simple PBR materials with neutral colors. No baked lighting, no environment background, no characters, no text or logos. Ex