Underbloom

Evidence

Ran on Kiln's test stand (2026-11-04): Underbloom did not start: java.lang.NoSuchFieldError: Class net.minecraft.core.registries.BuiltInRegistries does not have member field 'net.minecraft.core.Registry ENVIRONMENT_ATTRIBUTE'; UnderbloomClient did not start: java.lang.NoClassDefFoundError: net/minecraft/core/particles/ParticleType.

What it needs from Kiln

• Mixin
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.renderpearl.api.pipeline.BlendFunction
• com.mojang.renderpearl.api.pipeline.ColorTargetState
• com.mojang.renderpearl.api.pipeline.CompareOp
• com.mojang.renderpearl.api.pipeline.DepthStencilState
• com.mojang.renderpearl.api.pipeline.RenderPipeline
• com.mojang.renderpearl.api.pipeline.RenderPipeline.Builder
• com.mojang.renderpearl.api.pipeline.RenderPipeline.Snippet
• net.fabricmc.fabric.api.client.particle.v1.ParticleProviderRegistry
• net.fabricmc.fabric.api.client.particle.v1.ParticleProviderRegistry.PendingParticleProvider
• net.fabricmc.fabric.api.client.rendering.v1.EntityRendererRegistry
• net.fabricmc.fabric.api.client.rendering.v1.LivingEntityRenderLayerRegistrationCallback
• net.fabricmc.fabric.api.client.rendering.v1.LivingEntityRenderLayerRegistrationCallback.RegistrationHelper
• net.fabricmc.fabric.api.client.rendering.v1.ModelLayerRegistry
• net.fabricmc.fabric.api.client.rendering.v1.ModelLayerRegistry.TexturedLayerDefinitionProvider
• net.fabricmc.fabric.api.object.builder.v1.entity.FabricDefaultAttributeRegistry
• net.fabricmc.fabric.api.object.builder.v1.world.poi.PoiHelper
• net.fabricmc.fabric.api.particle.v1.FabricParticleTypes
• net.minecraft.advancements.triggers.CriteriaTriggers
• net.minecraft.advancements.triggers.ItemUsedOnLocationTrigger
• net.minecraft.advancements.triggers.PlayerTrigger
• net.minecraft.client.Camera
• net.minecraft.client.model.AdultAndBabyModelPair
• net.minecraft.client.model.EntityModel
• net.minecraft.client.model.HumanoidModel
• net.minecraft.client.model.QuadrupedModel
• net.minecraft.client.model.geom.EntityModelSet
• net.minecraft.client.model.geom.ModelLayerLocation
• net.minecraft.client.model.geom.ModelLayers
• net.minecraft.client.model.geom.ModelPart
• net.minecraft.client.model.geom.PartPose
• net.minecraft.client.model.geom.builders.CubeDeformation
• net.minecraft.client.model.geom.builders.CubeListBuilder
• net.minecraft.client.model.geom.builders.LayerDefinition
• net.minecraft.client.model.geom.builders.MeshDefinition
• net.minecraft.client.model.geom.builders.PartDefinition
• net.minecraft.client.model.monster.slime.SlimeModel
• net.minecraft.client.model.monster.zombie.ZombieModel
• net.minecraft.client.particle.BaseAshSmokeParticle
• net.minecraft.client.particle.ParticleProvider
• and 81 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

A glowing fungal cave biome full of giant mushrooms, truffle-hunting hogs and the spore-ridden things that live among them.

Scan

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