This is Immersive Portals Mod for Forge. The Fabric version
See through portals and go through portals seamlessly without loading screen.
See the Wiki
The mainly supported version is the Fabric version. Fixing Forge-version-specific issues is in low priority. It's recommended to use the Fabric version. The Fabric version is more stable than the Forge version.
(1.14 version of this mod is incompatible with OptiForge because of a Forge's issue. If you want to use OptiFine with this mod in 1.14 you need to use older version of Forge such as 28.1.114).
The 1.14 and 1.15 version of this mod depends on MixinBootstrap
When used with OptiFine, you need to turn off "Render Regions" option.
Discord Server: https://discord.gg/BZxgURK