TL;DR of the post, generated automatically.

The post shares a lightweight black hole shader for Blender, built with a simpler method than the raymarching the author first tried.

• Effects: Gravitational lensing, a photon sphere, and an event horizon with a shadow.
• Scene: An HDRI, a sphere and a disk.
• Accuracy: The post calls it a rough approximation, not a realistic black hole, though it keeps some real black hole properties.
• Availability: The author plans to share it for free on Gumroad later.

Raymarching out, black hole in.