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How to add shaders

Mod Iris is in the modpack to provide support for Iris and OptiFine shaders.

  1. Open Minecraft with Fabulously Optimized installed

  2. Open Options... → Video Settings... → Shader Packs...

  3. Download any shader pack from Modrinth or CurseForge

  4. Drag the ZIP file into the shader pack screen

  5. Select the shader, make sure Shaders is set to enabled and click Apply

  6. The shader has been applied!

  1. Click a shader

  2. Click Shader Pack Settings... below

  3. Adjust settings as needed

  4. Click Shader Pack List...

  5. Click Done

Looking for OptiFine's internal shaders? Try internal-shaders (shader), Simply No Shading (mod) or Flat Lighting (mod).

You may have noticed that Iris shaders do not work when using the Vulkan rendering engine. This is known and expected, as these shaders are built for the older format, OpenGL.

Therefore, a successor to Iris is being built by the same developers, called Aperture. This is expected to be more performant and supported by the same shader projects you already know from Iris.

Currently, it is unknown when Aperture is ready for use. The modpack will likely include it once OpenGL is actually deprecated by Mojang.

There are also other mods available now that claim to provide shaders in Vulkan. These have limited selection, limited functionality and will not be supported by this modpack.

These kinds of shaders are rare and may not work in the modpack. Prefer Iris/OptiFine shaders whenever possible.

"Fabulous shaders" are vanilla-compatible shaders that work by enabling Fabulous! graphics in video settings and getting a specific resource pack.

Installation

  1. Go to Options -> Video Settings -> Quality -> Graphics: Fabulous!

  2. Download any Fabulous shader pack. Ensure the shader mentions "fabulous", not just "core"!

  3. Move the shader pack to resourcepacks folder or drag it into the resourcepacks screen

  4. Apply the resource pack in resource packs screen

These kinds of shaders are likely to cause crashes and visual issues. Proceed with caution. Read more

"Core shaders" are a kind of vanilla shaders included in resource packs to adjust the vanilla HUD and add special effects. These usually do not change landscapes overall.

Examples of working core shaders of Vanilla Tweaks:

  • Translucent Spyglass Overlay

  • No Spyglass Overlay

Examples of not working core shaders of Vanilla Tweaks:

  • Mob Spawn Indicator

  • Wavy Leaves

  • Wavy Plants

  • Wavy Water

Luckily those features can be replicated with Iris shaders or other mods, so you're not missing out.

Avoid using core shaders for "fullbright", use a dedicated mod instead.

Installation

  1. Download a core shader resource pack from Modrinth

  2. Move the resource pack to resourcepacks folder or drag it into the resourcepacks screen

  3. Apply the resource pack in resource packs screen

  4. See if it works.

    • If yes, enjoy!

    • If not, use Iris shaders or other mods for the same purpose.

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