To utilize SEUS PTGI, the user install OptiFine. If the user is playing on Forge, they must wait for a specific OptiFine release compatible with their target Forge version and install OptiFine directly into the mods folder. If OptiFine is not compatible with that specific Forge version, SEUS PTGI cannot be used in that modpack.
Here is a you could implement or request for a mod that bridges SEUS PTGI with Iris + Oculus (Forge): seus ptgi iris compatibility oculus forge
Here is a comprehensive breakdown of compatibility and installation for these tools. The Core Compatibility Conflict To utilize SEUS PTGI, the user install OptiFine
