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To analyze the energy requirements for green buildings, it is important to replicate living conditions and consider various architectural elements.

Energy3D is a portable CAD utility that lets users create 3D buildings by drawing platforms, walls, doors, windows, floors, and roofs. It also provides energy analysis parameters and solar radiation maps. The program runs on Java and offers interactive mode for previewing the building from different angles. It allows users to print the generated images or save them to PNG file format. Energy3D offers good image quality, but may slow down the computer due to high CPU and memory usage.