Custom Hitboxes

Evidence

Ran on Kiln's test stand (2026-11-04): CustomHitboxes did not start: java.lang.NoClassDefFoundError: net/minecraft/world/entity/boss/enderdragon/EnderDragonPart.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.platform.InputConstants.Key
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.blaze3d.vertex.PoseStack.Pose
• com.mojang.blaze3d.vertex.VertexConsumer
• net.minecraft.client.Camera
• net.minecraft.client.CameraType
• net.minecraft.client.OptionInstance
• net.minecraft.client.Options
• net.minecraft.client.gui.components.debug.DebugScreenEntries
• net.minecraft.client.gui.components.debug.DebugScreenEntryList
• net.minecraft.client.renderer.entity.EntityRenderDispatcher
• net.minecraft.client.renderer.rendertype.RenderTypes
• net.minecraft.util.Mth
• net.minecraft.world.entity.EntityDimensions
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.EquipmentSlot
• net.minecraft.world.entity.boss.enderdragon.EnderDragon
• net.minecraft.world.entity.boss.enderdragon.EnderDragonPart
• net.minecraft.world.phys.AABB
• InputConstants.UNKNOWN
• Minecraft.crosshairPickEntity
• Minecraft.debugEntries
• Minecraft.getCameraEntity()
• Minecraft.getEntityRenderDispatcher()
• Minecraft.options
• ClientLevel.entitiesForRendering()
• LocalPlayer.entityInteractionRange()
• LocalPlayer.getEyePosition()
• DefaultedRegistry.iterator()
• BuiltInRegistries.ENTITY_TYPE
• Entity.getBbHeight()
• Entity.getBbWidth()
• Entity.getBoundingBox()
• Entity.getEyeHeight()
• Entity.getPosition()
• Entity.getType()
• Entity.getViewVector()
• Entity.isInvisible()
• Entity.position()
• LivingEntity.hurtTime
• and 15 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 complete overhaul of Minecraft's hitboxes

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file CustomHitboxes-3.0.0+26.3.jar. The scan reads the mod's classes; it does not run them.