It's a Minecraft mod that provides see-through portals and seamless teleportation. It also can create "Non-Euclidean" (Uneuclidean) space effect.

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This mod changes a lot of underlying Minecraft mechanics. This mod allows the client to load multiple dimensions at the same time and synchronize remote world information(blocks/entities) to client. It can render portal-in-portals. The portal rendering is roughly compatible with some versions of Sodium and Iris. The portal can transform player scale and gravity direction. Implementation Details

(This is the Fabric version of Immersive Portals. The Forge version)

This mod also provides some API for:

• Manage see-through portals
• Dynamically add dimensions
• Synchronize remote chunks to client
• Render the world into GUI
• Other utilities

API description.

https://fabricmc.net/wiki/tutorial:setup

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