3D rendered and streamed in real-time?

That's Unreal.

The NDI Unreal Engine SDK adds full IP video and audio support within Unreal Engine 5.3, unlocking real-time 3D, AR, and VR content creation.

https://ndi.video/download-ndi-unreal-engine-sdk/

Complete IP support.

Enable your Unreal Engine 5 to find, send, and receive video streams over IP – including an alpha channel – with a resolution and frame rate-independent encoding algorithm, supporting up to 4K and beyond, along with 16 floating-point audio channels.