3D AI Virtual Avatar Multi-Scenario Application Solution: An Intelligent Interaction System Connecting Open-Source LLMs and Local AI ServersI. Background and Core ValueIn the current era of accelerated digital transformation, traditional text-based or 2D customer service and presentation modes can no longer meet users' demands for immersive and human-like interactions. The 3D AI Avatar, with its highly realistic visual presentation and natural voice interaction capabilities, has become a key tool for bridging "virtual service scenarios" and "real user needs." This solution focuses on implementing 3D AI virtual avatars across six core scenarios: online customer service, front desk reception, sales conversion, 3D environment product demonstrations, instructional guidance, and internal enterprise collaboration. By interfacing with the latest open-source cloud LLM models (such as Llama 3, Qwen-7B) or privately deployed local AI servers,