Chromalume Shader

An original shader pack for Iris with a soft, colourful, cinematic look: warm sunsets, deep starry nights, a spectacular End sky and light that behaves — it is recoloured by stained glass and reflected by polished blocks.

Highlights

Light & shadows

• Physically based lighting (GGX), soft coloured shadows (stained glass and water tint sunlight)
• Screen-space ambient occlusion, volumetric light shafts, subsurface scattering on leaves, plants, ice and mobs
• Dynamic light in your hands, coloured by the item
• Experimental: coloured block light — lamp light that passes through stained glass takes the glass colour (voxel light, off by default)

Sky

• Volumetric clouds with shadows on the ground, thin cirrus clouds that catch the sunset
• Sun and moon with phases and a 22° moon halo, stars, Milky Way, shooting stars, northern lights
• The End: nebulae, galaxy band, drifting light curtains and a black hole with an accretion disk

Water & weather

• 3D waves, refraction, caustics, shore foam, biome-aware tint, reflections
• Rain puddles that dry out, wet surfaces, lava glow with heat distortion

Materials

• Works without a resource pack (generated normals and materials) and supports LabPBR / OldPBR
• Parallax occlusion mapping with self-shadowing, glowing ores, glossy armour (not netherite or leather)
• Wind on grass, flowers, leaves, vines, chains, lanterns, water plants and Nether plants

Camera

• TAA, bloom, lens flare, depth of field, motion blur, chromatic aberration, ACES / filmic tonemapping, colour grading

• Needs Iris (Sodium recommended). Iris renders with OpenGL; Vulkan is not supported. OptiFine has not been tested.

• Two downloads: Universal (recommended) and Legacy (no compute shaders / GL 4.3 features — try it on old Iris, macOS or old drivers).

• Coloured block light needs an Iris with compute shaders and custom images (1.6+) and OpenGL 4.3. Everywhere else the pack silently keeps vanilla block light.

• Menus: English, Русский, Українська.

Settings

Pick a profile (Low / Medium / High / Ultra) in the shader options, then tweak anything: shadow resolution, clouds, SSAO, reflections, POM, post-processing and more.

Notes

• Blocks added after 1.21 work, but do not get special waving or glow until they are added to the block list. Tell me which ones are missing.
• Original GLSL code. The feature set is inspired by Complementary Shaders; no code from it was used.

Feedback

Please include a screenshot, your Minecraft version and your Iris version in bug reports.