Veil Iris Lights Compat

Brings Veil shader effects and dynamic lights into the active Iris shaderpack pipeline.

Minecraft 1.21.1 · NeoForge · Client-side only · Current version: 1.4.0

Veil effects normally render outside a shaderpack's G-buffer. With Iris shaders enabled, they can disappear, use incorrect depth, or stop contributing visible light.

Veil Iris Lights Compat, shortened to VILC, translates compatible Veil shaders for Iris and adds dedicated render passes for standard Veil point and area lights. Version 1.4.0 also keeps those lights visible when Iris is installed but no shaderpack is active.

Features

• Renders compatible Veil effects through active Iris shaderpacks
• Translates Veil vertex and fragment behavior into Iris G-buffer programs
• Supports opaque and translucent Veil effects
• Uses Iris EntitiesTrans programs when available
• Provides a dithering fallback for unsupported translucent paths
• Integrates compatible Veil geometry into Iris shadow rendering
• Automatically rebuilds translated shaders after shaderpack reloads
• Supports standard Veil point lights
• Supports standard Veil rectangular area and cone lights
• Mixes multiple differently colored lights
• Reconstructs world positions and surface normals from shaderpack depth
• Adds angle-dependent diffuse lighting
• Supports configurable voxel occlusion and block shadows
• Uses perceptual color normalization for more even RGB brightness
• Preserves visible surface texture under bright and overlapping lights
• Uses a single controlled shaderpack light pass to avoid excessive saturation
• Provides a dedicated depth-based framebuffer pass while shaderpacks are disabled
• Automatically switches between the native framebuffer and Iris shaderpack passes

VILC does not add blocks or gameplay content by itself. It renders lights created through Veil by other mods, including YesMenn! Colored Lights.

In-Game Configuration

Open the configuration through the mod list or with O by default.

Quality Presets

Preset	Point Lights	Area Lights	Surface Normals	Voxel Shadows
Performance	24	8	Fast	Disabled
Balanced	48	16	Fast	Enabled
High	96	32	Detailed	Enabled

Every performance option can also be changed independently:

• Point-light budget from 1 to 96
• Area-light budget from 1 to 32
• Detailed surface normals
• Voxel shadows

Appearance controls update live:

• Exposure
• Color strength
• Color saturation
• Neutral lift
• Luminance normalization limit

The Reset button only restores appearance controls. Custom light budgets and quality options remain untouched.

Configuration is stored in config/veil_iris_lights.json.

Debugging

• Adds active pass state and light counts to the F3 debug screen
• Supports BetterF3
• Shows configured point- and area-light budgets
• Reports voxel-occlusion and rendering state

Requirements

Dependency	Requirement
Minecraft	1.21.1
NeoForge	21.1.228 or newer
Iris	1.8.14 beta 1 or newer
Veil	4.1.4 or newer
Sodium	0.8.12 beta 1 or newer

Install VILC only on clients. Dedicated servers do not need it.

Mod Developer Support

Mods using Veil's standard PointLightData and AreaLightData automatically use VILC's compatible light passes. A direct Java dependency on VILC is not required for standard lights.

Blocks containing a light source can opt out of self-occlusion through:

#veil_iris_lights:non_occluding

Client mods may also register blocks directly:

VeilIrisLightOcclusion.registerNonOccluding(
    ResourceLocation.fromNamespaceAndPath("example", "light_block")
);

Custom Veil light renderer types outside the standard point- and area-light APIs require separate integration.

Compatibility Notes

• Shaderpacks differ significantly, so unusual pipelines may still need specific compatibility work
• Voxel shadows use a camera-centered 64 x 64 x 64 block grid
• Complex partial block models are approximated
• Leaves use partial voxel transmission rather than texture-alpha sampling
• Occlusion outside the available voxel grid cannot be perfectly reconstructed
• Light budgets limit how many visible Veil lights are processed per frame

Works Well With

• YesMenn!(soon!) for configurable RGB Colored Lights
• Other mods using Veil point or area lights
• BetterF3 for extended debug layouts

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Made by YesMenn!