Butterfly API

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): ButterflyApiMod did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload; ButterflyApiClient did not start: java.lang.NoClassDefFoundError: com/mojang/renderpearl/api/pipeline/RenderPipeline.

What it needs from Kiln

Mixin
com.mojang.blaze3d.vertex.DefaultVertexFormat
com.mojang.blaze3d.vertex.PoseStack
com.mojang.renderpearl.api.pipeline.PrimitiveTopology
com.mojang.renderpearl.api.pipeline.RenderPipeline
com.mojang.renderpearl.api.pipeline.RenderPipeline.Builder
com.mojang.renderpearl.api.pipeline.RenderPipeline.Snippet
net.fabricmc.api.EnvType
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientBlockEntityEvents
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientBlockEntityEvents.Load
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientBlockEntityEvents.Unload
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents.Load
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents.Unload
net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Join
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
net.fabricmc.fabric.api.client.particle.v1.ParticleProviderRegistry
net.fabricmc.fabric.api.client.particle.v1.ParticleProviderRegistry.PendingParticleProvider
net.fabricmc.fabric.api.client.rendering.v1.ModelLayerRegistry
net.fabricmc.fabric.api.client.rendering.v1.ModelLayerRegistry.TexturedLayerDefinitionProvider
net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderContext
net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderEvents
net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderEvents.CollectSubmits
net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
net.fabricmc.fabric.api.creativetab.v1.FabricCreativeModeTab
net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents
net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents.AfterEntityChange
net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents.AfterPlayerChange
net.fabricmc.fabric.api.event.lifecycle.v1.ServerBlockEntityEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerBlockEntityEvents.Unload
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopped
net.fabricmc.fabric.api.networking.v1.EntityTrackingEvents
net.fabricmc.fabric.api.networking.v1.EntityTrackingEvents.StartTracking
net.fabricmc.fabric.api.networking.v1.EntityTrackingEvents.StopTracking
net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
net.fabricmc.fabric.api.networking.v1.PlayerLookup
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

An API to simplify Math and Registries.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file butterfly-api-1.4.0+26.3.jar. The scan reads the mod's classes; it does not run them.

Reports from players

No reports from players yet.

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