Snow Under Trees

Evidence

Ran on Kiln's test stand (2026-11-04): FabricEntrypoint did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/BlockGetter; FabricClientEntrypoint did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/screens/options/OptionsSubScreen.

What it needs from Kiln

• an access widener
• net.fabricmc.fabric.api.biome.v1.BiomeModification
• net.fabricmc.fabric.api.biome.v1.BiomeModificationContext
• net.fabricmc.fabric.api.biome.v1.BiomeModificationContext.GenerationSettingsContext
• net.fabricmc.fabric.api.biome.v1.BiomeModifications
• net.fabricmc.fabric.api.biome.v1.BiomeSelectionContext
• net.fabricmc.fabric.api.biome.v1.ModificationPhase
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndLevelTick
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.StartLevelTick
• net.minecraft.core.BlockPos.MutableBlockPos
• net.minecraft.server.level.ChunkHolder
• net.minecraft.server.level.ChunkMap
• net.minecraft.server.level.ChunkResult
• net.minecraft.server.level.ServerChunkCache
• net.minecraft.tags.BlockTags
• net.minecraft.world.level.ChunkPos
• net.minecraft.world.level.LightLayer
• net.minecraft.world.level.WorldGenLevel
• net.minecraft.world.level.biome.Biome
• net.minecraft.world.level.biome.Biome.Precipitation
• net.minecraft.world.level.block.SnowLayerBlock
• net.minecraft.world.level.chunk.LevelChunk
• net.minecraft.world.level.gamerules.GameRules
• net.minecraft.world.level.levelgen.GenerationStep
• net.minecraft.world.level.levelgen.GenerationStep.Decoration
• net.minecraft.world.level.levelgen.Heightmap
• net.minecraft.world.level.levelgen.Heightmap.Types
• net.minecraft.world.level.levelgen.feature.Feature
• org.apache.commons.lang3.tuple.Pair
• net.minecraft.world.level.BlockGetter
• net.minecraft.client.gui.screens.options.OptionsSubScreen
• FabricLoader.isModLoaded()
• BlockPos.mutable()
• Holder.is()
• Registry.get()
• BuiltInRegistries.REGISTRY
• Registries.FEATURE_TYPE
• Registries.PLACED_FEATURE
• ServerLevel.getBiome()
• ServerLevel.getBlockRandomPos()
• and 14 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

Adds snow under trees in snowy biomes

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file snowundertrees-fabric-26.3-1.6.1.jar. The scan reads the mod's classes; it does not run them.