PolyHitbox (Custom Hitboxes)

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

Evidence

Ran on Kiln's test stand (2026-11-04): PolyHitboxClient did not start: java.lang.IllegalAccessException: class kiln.Loader cannot access a member of class org.polyfrost.polyhitbox.PolyHitboxClient with modifiers "private".

What it needs from Kiln

an access widener
Mixin
net.minecraft.world.entity.ExperienceOrb
net.minecraft.world.entity.Mob
net.minecraft.world.entity.decoration.ArmorStand
net.minecraft.world.entity.decoration.HangingEntity
net.minecraft.world.entity.item.ItemEntity
net.minecraft.world.entity.monster.Enemy
net.minecraft.world.entity.projectile.Projectile
net.minecraft.world.entity.projectile.arrow.AbstractArrow
net.minecraft.world.entity.projectile.hurtingprojectile.Fireball
net.minecraft.world.entity.projectile.hurtingprojectile.WitherSkull

On the roadmap: Code next to data (0.3), Mixin (0.5)

In the author's words

Improves performance of hitbox rendering and adds per-hover and per-damaged (i-frame) colors. By Polyfrost, best with OneClient.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file polyhitbox-1.3.8+26.3.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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