Spherical Shader

Preview: https://youtu.be/HVSlC3Dm624

User Guide: Spherical Shader User Guide

Spherical Shader is a vertex shader that allows you to create
the illusion of a spherical world by simply using a Material
Function and a Blueprint Component. The curvature is controlled by
a Material Parameter Collection, but its parameters do not need to
be directly set. They are controlled by the Blueprint Component.
(Note: This is a vertex shader which affects the way vertices are
rendered and does not affect collision or physics.)

Please note:

• The spherical effect only calculates a
  hemisphere, the top half of the sphere based on
  where the player is standing. This is a limitation of the math used
  and prevents things far away on the horizon from wrapping under and
  back around behind the player.
• Keep in mind that the actual world, gameplay space and
  collision, remains flat. This shader simply offsets the vertices at
  render time to make them appear as if spherical from the player’s
  perspective.
• This material function affects vertices only and not collision.
  As such, certain gameplay mechanics, such as those using line
  traces from the camera, might not appear to match up with geometry
  when this shader is used.