Model Gap Fix guide for All the Mods 10 0.51

Same as in the All the Mods 10 8.1 guide

Model Gap Fix is a small client-side mod that fixes a long-standing Mojang bug, MC-73186. That bug shows up as thin gaps in block models and item models, and possibly in other models too.^[1]

The fix is simple. The mod removes texture zooming, so every model face uses 100% of its texture instead of a slightly zoomed-in part of it.^[1]

Who it's for

Everyone who plays the pack benefits, and you don't have to do anything. The gaps were most noticeable on custom block models and on some 2D items, and the mod cleans those up automatically.^[1]

What it does for 2D items

Removing zoom alone creates another kind of tiny, flickering gap in 2D item models, because they are generated quad by quad. To cover those, the mod changes the item model generator. It never makes a quad that covers a transparent pixel, and it builds multiple quads for each row of solid pixels instead. That lets it slightly enlarge the side quads without opening new gaps. According to the mod's page, this extra step only applies on Forge, because Fabric doesn't get those tiny lines.^[1]

Will it hurt performance?

No. Removing texture zooming just removes some code and has no real impact. The item model tweak can add a couple more quads for concave item textures compared to vanilla. The author calls that negligible, and says it could only matter with high-resolution resource packs.^[1]

In this pack

The pack ships Model Gap Fix version 1.21-1.10 as the file modelfix-1.21-1.10.jar. It was already included in earlier releases of the pack.^[2]

Unverified The sources don't show any recipes, quests, configs or progression role for this mod, so there is nothing to unlock or craft. It is a background fix rather than part of the pack's progression.

Same as in the All the Mods 10 8.1 guide

Good news: there's nothing to craft to get started with Model Gap Fix. It's a simple client-side mod that fixes the Mojang bug MC-73186, which causes gaps in block models and item models. It works on its own, so you don't need to set anything up.^[1]

What it does for you

The mod removes texture zooming, so every model face uses 100% of its texture. That closes the gaps on items, where they're most noticeable, and on block models too. The gaps were especially visible on custom block models and some 2D items, which is handy in a pack with lots of modded content.^[1]

For 2D item models, the mod also changes how the item model generator builds its quads. It no longer creates a quad that covers a transparent pixel, and instead makes multiple quads for each row of solid pixels. That covers the tiny flickering gaps that removing texture zooming alone would leave. The source says this last part only applies on Forge.^[1]

What to do first

1. Load into the world as usual. The fix applies to rendering automatically, so there's no item to make or quest to start.^[1]
2. Look closely at a 2D item or a custom block model. Any seams or gaps that vanilla rendering would show should no longer appear.^[1]

Unverified The sources I have don't confirm any items, recipes, quests or config options for this mod in this pack, so there are no recipes to show here. If you see something different in game, treat it as unconfirmed.

Model Gap Fix is a client-side mod with no machines, blocks or items of its own, it's a rendering fix that runs quietly in the background. Its whole job is to get rid of the thin transparent seams that show up on block models and item models, an issue that's most obvious on items and on custom or 2D models.^[1]

How the fix works

The base fix is about as simple as it gets: the mod removes texture zooming, so every model face uses 100% of its texture instead of a very slightly shrunken slice of it. That single change clears up the gaps on items, on block models, and on anything else that goes through those same functions.^[1]

Flat 2D item models need a second pass. Because they're generated quad by quad, removing texture zooming on its own leaves a different kind of gap, tiny lines that flicker as you move. To deal with those, the mod changes the item model generator so it never creates a quad that covers a transparent pixel, building multiple quads instead, one for each row of solid pixels running in the same direction. With no transparent pixels inside a quad, the mod can slightly enlarge all those side quads and cover the remaining seams without opening up new ones.^[1]

That second step is Forge-specific. On Fabric those tiny lines don't seem to appear, and the models come out correct with no extra quads at all.^[1]

Performance

Removing texture zooming just deletes some code, so it has no performance cost. The item model tweak can add a couple more quads for concave item textures compared to vanilla, which the author describes as negligible and only potentially relevant if you're running high resolution resource packs.^[1]

Tuning the item quads

Two client options control how far those generated item quads get nudged and stretched, and this pack ships them with specific values. default.item_quads_expansion is the quad expansion increment: it enlarges each quad to hide gaps, and the pack leaves it at 0. Turning it above 0 slightly increases the number of quads per item model, which the config notes could be an issue with HD texture packs; the suggested values to try are 0.002 or 0.008.^[3]

default.item_quads_indent is the quad x/y offset, it simply moves the quad toward the centre of the item to hide gaps. The pack sets this to 0.007. Both options accept a range of -0.1 to 0.1, and the config advises keeping both as close to 0 as possible.^[3]

The macOS branch

There's a separate set of options for macOS. Some macOS systems have been reported to suffer from atlas bleeding, which means the mod can't apply its main fix of removing atlas shrinking there. Instead it reduces the shrinking as much as possible by multiplying it, which is what mac_os.shrink_ratio_multiplier controls. The pack leaves it at 1, the top of its 0.0 to 1.0 range, which keeps vanilla behaviour to prevent atlas bleeding; setting it to 0 gives you the non-macOS behaviour.^[3]

The macOS branch has its own copies of the quad settings. mac_os.item_quads_expansion is the same quad expansion increment and sits at 0 in this pack, while mac_os.item_quads_indent is the same x/y offset and is set slightly higher at 0.0099. Both share the -0.1 to 0.1 range of their default counterparts.^[3]

Unverified The exact behaviour of the macOS detection (whether the mac_os block is applied automatically on Apple systems or has to be enabled manually) isn't covered by the available sources.

Model Gap Fix is a client-side mod, and its settings all live in one file: config/modelfix-client.toml. The file has two groups of options, one called default and one called mac_os. Each option accepts values from -0.1 to 0.1, except the shrink multiplier, which goes from 0.0 to 1.0.^[1][3]

The default group

• default.item_quads_expansion is set to 0 in this pack. It enlarges each quad to hide gaps. The config notes that any non-zero value slightly increases the number of quads per item model, which could matter with HD texture packs, and it suggests trying 0.002 or 0.008 if you want to experiment.^[3]
• default.item_quads_indent is set to 0.007 in this pack. It offsets the quad on the x/y axes, moving it toward the center of the item, which also helps hide gaps.^[3]

The mac_os group

The config says some macOS systems are affected by atlas bleeding. On those systems the mod can't apply its main fix, which is removing atlas shrinking, so it reduces the shrinking as much as it can instead. This group holds the settings for that case.^[3]

• mac_os.item_quads_expansion is set to 0 in this pack, the same as the default group.^[3]
• mac_os.item_quads_indent is set to 0.0099 in this pack, a bit higher than the 0.007 used in the default group.^[3]
• mac_os.shrink_ratio_multiplier is set to 1 in this pack. The config says 1 keeps vanilla behavior to prevent atlas bleeding, and 0 gives the non-macOS behavior.^[3]

The mod's fix works by removing texture zooming, so every model face uses 100% of its texture. For 2D item models it also changes how the item model generator builds quads, and the indent and expansion options tune that part.^[1]

Unverified The sources only show the values this pack uses. They don't list the mod's own defaults, so I can't confirm which of these values the pack changed.

There isn't much history to tell for Model Gap Fix in this pack. All the Mods 10 0.51 ships Model Gap Fix 1.21-1.10 (file modelfix-1.21-1.10.jar), and the mod was first included in All the Mods 10 0.32 or earlier.^[4]

The mod's own changelog for 1.21-1.10 has a single entry: it fixed an issue on NeoForge. No more detail is given about what the issue was.^[5]

The pack changelogs have no entries for this mod, so there are no pack-specific changes to report.^[4]