What are typical implementation forms for real-time 3D engines?

Typical implementation forms for real-time 3D engines mainly include standalone software, integrated development kits (SDKs), and cloud-based rendering services. Standalone software, such as Unity or Unreal Engine, provides a self-contained environment with complete tools for 3D content creation, editing, and real-time rendering. SDKs, like Godot Engine SDK, allow developers to embed 3D capabilities into existing applications by integrating core engine functions. Cloud-based services, such as AWS Sumerian, handle rendering on remote servers, enabling lightweight access to 3D content via browsers or low-performance devices without local engine installation.