Item Model Fix — Full Port for Minecraft 1.20.1 (Forge)

Fixes gaps in generated item models.

Vanilla's generated item models shrink UVs, which can leave visible gaps between pixels on 2D item sprites. Item Model Fix corrects the generated UVs so item models render seamlessly.

This branch is a full port of the original mod to Minecraft 1.20.1 (Forge): the old baked-model ItemModelGenerator (net.minecraft.client.renderer.block.model.ItemModelGenerator) still exists on this version, so the complete original generation logic — VANILLA / UNLERP / OUTLINE / PIXEL — works here, hooked via a Mixin on ItemModelGenerator.processFrames, exactly as in the original. The 26.3 (main) branch cannot do this because that generator was removed in 26.3's new cuboid model system.

Generation modes

• VANILLA — original behaviour, no fix applied
• UNLERP — vanilla generation with UV math applied to fix gaps
• OUTLINE (default) — same as Unlerp, via a different algorithm that prevents enchantment-glint flickering
• PIXEL — generates every pixel individually; best results, higher cost with high-resolution resource packs

Configuration

No Cloth Config / ModMenu dependency on this port. Edit config/itemmodelfix.json and set "generationType" to one of VANILLA, UNLERP, OUTLINE, PIXEL.

Port notes (1.20.1)

• Java 17 · Forge 47.4.20+ · Mojang official mappings
• Built and verified in CI via GitHub Actions (build + runtime test)

Installation

1. Install Forge for Minecraft 1.20.1
2. Drop itemmodelfix-1.20.1-forge-*.jar into your mods folder

Original mod & credit

This is an unofficial port by Itamio of Item Model Fix by PepperCode1 — the original (926k downloads on Modrinth, last updated for 1.19.2) has not been updated past 1.19.2.

• Original mod: https://modrinth.com/mod/item-model-fix
• Original source: https://github.com/PepperCode1/Item-Model-Fix
• License: LGPL-3.0-only — see LICENSE

All credit for the original concept, design, and logic goes to PepperCode1. This port exists to bring it to Minecraft 1.20.1. See NOTICE.