1.21.4 Minecraft Java with Radiance Vulkan Ray-tracing on 5070 Ti
Music all non-attribution downloaded from You Tube Audio Library
Mods from https://modrinth.com/
Radiance Mod Compatibility — Working Notes
Confirmed working (tested):
Continuity, Zoomify, Coords, Mod Menu, YACL, Fabric Language Kotlin, Fabric API
Mod categories likely to be compatible:
Map/minimap mods (UI layer only), HUD and interface mods, inventory and crafting QOL, waystones and navigation, audio mods, world and gameplay mods (Serene Seasons etc). General rule — if it doesn't touch the render pipeline it's a candidate.
Avoid:
Sodium, Iris, OptiFine, anything describing itself as a rendering optimisation or shader mod.
Useful indicator:
YACL and Fabric Language Kotlin both stable — any mod depending on either is more likely to work, opens up a reasonable portion of the Fabric ecosystem still to be checked.