Unresolved Texture Stitching Bug - Transparent Edges on Items (Rendering/UV Bleeding Issue)

In Minecraft: Java Edition, certain 3D rendered item models especially tools, weapons and custom items display thin, unintended transparent lines or “seams” along the edges of their textures. This visual glitch is present in first-person view, third-person view, and when items are displayed in item frames.

This issue appears to be caused by texture atlas bleeding or UV misalignment, potentially due to fractional texture coordinate sampling, mipmapping, or the addition of texture zooming, which was originally introduced to fix mipmap artifacts but now seems to offset texture coordinates slightly. These seams appear more prominently on high-contrast textures and dark-colored models.

The bug affects both vanilla and custom resource packs, is reproducible without any shaders or mods, and has existed across many major versions of Minecraft Java, from at least version 1.8 through the current 1.21.5. It does not occur in Bedrock Edition, where item models render cleanly without visible seams.

Steps to Reproduce

1. Launch Minecraft Java Edition (any version, e.g. 1.21.5)

2. Equip a tool or weapon with a 3D model (e.g a sword or pickaxe)

3. Observe the edges of the item model in first-person view, thin transparent lines may be visible

4. Repeat in third-person or item frames to confirm consistency

Expected Result

Item models should appear seamless and fully textured, with no transparent borders or visible stitching lines.

Actual Result

Thin transparent seams are visible on the edges of 3D item models, even with default assets and settings.

Comunity Context

Several community-made mods, including Item Model Fix and Item Stitching Fix, have attempteed to resolve this issue by adjusting how Java handles texture rendering on item models. These mods can significantly reduce or eliminate these seams, confirming that the issue is fixable.

However, relying on mods for this functionality requires players to update them manually for each new Minecraft version. An official fix by Mojang would greatly improve the game’s visual polish and reduce the burden on modders, especially as more players use custom models and high-resolution textures.