Sneaking (#237)

* start implementing sneaking

* fix horizontal_collision being inverted and cleanup

* clippy

* change dimensions and eye height based on pose

* proper support for automatically crouching in certain cases

* fix anticheat issues

* add line to changelog and update a comment

1 files changed, 145 insertions, 97 deletions

diff --git a/azalea-entity/src/dimensions.rs b/azalea-entity/src/dimensions.rs
index 68e9903d..92c03e61 100644
--- a/azalea-entity/src/dimensions.rs
+++ b/azalea-entity/src/dimensions.rs
@@ -1,15 +1,43 @@
 use azalea_core::{aabb::AABB, position::Vec3};
 use azalea_registry::EntityKind;
+use bevy_ecs::component::Component;
 
-#[derive(Debug, Default, Clone)]
+use crate::Pose;
+
+/// A component that contains the size of an entity and their eye height.
+#[derive(Component, Debug, Default, Clone)]
 pub struct EntityDimensions {
     pub width: f32,
     pub height: f32,
+    /// The offset of the entity's eyes from their coordinates.
+    ///
+    /// This is used to calculate the camera position for players, when
+    /// spectating an entity, and when raycasting from the entity.
+    ///
+    /// The default eye height for a player is 1.62 blocks.
+    pub eye_height: f32,
+    /// Whether the entity isn't allowed to be scaled.
+    pub fixed: bool,
 }
 
 impl EntityDimensions {
-    pub fn new(width: f32, height: f32) -> Self {
-        Self { width, height }
+    pub const fn new(width: f32, height: f32) -> Self {
+        Self {
+            width,
+            height,
+            eye_height: default_eye_height(height),
+            fixed: false,
+        }
+    }
+    pub const fn fixed(self) -> Self {
+        Self {
+            fixed: true,
+            ..self
+        }
+    }
+
+    pub const fn eye_height(self, eye_height: f32) -> Self {
+        Self { eye_height, ..self }
     }
 
     pub fn make_bounding_box(&self, pos: Vec3) -> AABB {
@@ -22,55 +50,59 @@ impl EntityDimensions {
     }
 }
 
+const fn default_eye_height(height: f32) -> f32 {
+    height * 0.85
+}
+
 impl From<EntityKind> for EntityDimensions {
     fn from(entity: EntityKind) -> Self {
         // this match statement is automatically generated by codegen/genentities.py,
         // don't edit it manually!
         match entity {
-            EntityKind::AcaciaBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::AcaciaChestBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::Allay => EntityDimensions::new(0.35, 0.6),
+            EntityKind::AcaciaBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::AcaciaChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::Allay => EntityDimensions::new(0.35, 0.6).eye_height(0.36),
             EntityKind::AreaEffectCloud => EntityDimensions::new(6.0, 0.5),
-            EntityKind::Armadillo => EntityDimensions::new(0.7, 0.65),
-            EntityKind::ArmorStand => EntityDimensions::new(0.5, 1.975),
-            EntityKind::Arrow => EntityDimensions::new(0.5, 0.5),
-            EntityKind::Axolotl => EntityDimensions::new(0.75, 0.42),
-            EntityKind::BambooChestRaft => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::BambooRaft => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::Bat => EntityDimensions::new(0.5, 0.9),
-            EntityKind::Bee => EntityDimensions::new(0.7, 0.6),
-            EntityKind::BirchBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::BirchChestBoat => EntityDimensions::new(1.375, 0.5625),
+            EntityKind::Armadillo => EntityDimensions::new(0.7, 0.65).eye_height(0.26),
+            EntityKind::ArmorStand => EntityDimensions::new(0.5, 1.975).eye_height(1.7775),
+            EntityKind::Arrow => EntityDimensions::new(0.5, 0.5).eye_height(0.13),
+            EntityKind::Axolotl => EntityDimensions::new(0.75, 0.42).eye_height(0.2751),
+            EntityKind::BambooChestRaft => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::BambooRaft => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::Bat => EntityDimensions::new(0.5, 0.9).eye_height(0.45),
+            EntityKind::Bee => EntityDimensions::new(0.7, 0.6).eye_height(0.3),
+            EntityKind::BirchBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::BirchChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
             EntityKind::Blaze => EntityDimensions::new(0.6, 1.8),
             EntityKind::BlockDisplay => EntityDimensions::new(0.0, 0.0),
-            EntityKind::Bogged => EntityDimensions::new(0.6, 1.99),
-            EntityKind::Breeze => EntityDimensions::new(0.6, 1.77),
-            EntityKind::BreezeWindCharge => EntityDimensions::new(0.3125, 0.3125),
-            EntityKind::Camel => EntityDimensions::new(1.7, 2.375),
-            EntityKind::Cat => EntityDimensions::new(0.6, 0.7),
-            EntityKind::CaveSpider => EntityDimensions::new(0.7, 0.5),
-            EntityKind::CherryBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::CherryChestBoat => EntityDimensions::new(1.375, 0.5625),
+            EntityKind::Bogged => EntityDimensions::new(0.6, 1.99).eye_height(1.74),
+            EntityKind::Breeze => EntityDimensions::new(0.6, 1.77).eye_height(1.3452),
+            EntityKind::BreezeWindCharge => EntityDimensions::new(0.3125, 0.3125).eye_height(0.0),
+            EntityKind::Camel => EntityDimensions::new(1.7, 2.375).eye_height(2.275),
+            EntityKind::Cat => EntityDimensions::new(0.6, 0.7).eye_height(0.35),
+            EntityKind::CaveSpider => EntityDimensions::new(0.7, 0.5).eye_height(0.45),
+            EntityKind::CherryBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::CherryChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
             EntityKind::ChestMinecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::Chicken => EntityDimensions::new(0.4, 0.7),
-            EntityKind::Cod => EntityDimensions::new(0.5, 0.3),
+            EntityKind::Chicken => EntityDimensions::new(0.4, 0.7).eye_height(0.644),
+            EntityKind::Cod => EntityDimensions::new(0.5, 0.3).eye_height(0.195),
             EntityKind::CommandBlockMinecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::Cow => EntityDimensions::new(0.9, 1.4),
-            EntityKind::Creaking => EntityDimensions::new(0.9, 2.7),
+            EntityKind::Cow => EntityDimensions::new(0.9, 1.4).eye_height(1.3),
+            EntityKind::Creaking => EntityDimensions::new(0.9, 2.7).eye_height(2.3),
             EntityKind::Creeper => EntityDimensions::new(0.6, 1.7),
-            EntityKind::DarkOakBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::DarkOakChestBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::Dolphin => EntityDimensions::new(0.9, 0.6),
-            EntityKind::Donkey => EntityDimensions::new(1.39648, 1.5),
+            EntityKind::DarkOakBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::DarkOakChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::Dolphin => EntityDimensions::new(0.9, 0.6).eye_height(0.3),
+            EntityKind::Donkey => EntityDimensions::new(1.39648, 1.5).eye_height(1.425),
             EntityKind::DragonFireball => EntityDimensions::new(1.0, 1.0),
-            EntityKind::Drowned => EntityDimensions::new(0.6, 1.95),
+            EntityKind::Drowned => EntityDimensions::new(0.6, 1.95).eye_height(1.74),
             EntityKind::Egg => EntityDimensions::new(0.25, 0.25),
-            EntityKind::ElderGuardian => EntityDimensions::new(1.9975, 1.9975),
+            EntityKind::ElderGuardian => EntityDimensions::new(1.9975, 1.9975).eye_height(0.99875),
             EntityKind::EndCrystal => EntityDimensions::new(2.0, 2.0),
             EntityKind::EnderDragon => EntityDimensions::new(16.0, 8.0),
             EntityKind::EnderPearl => EntityDimensions::new(0.25, 0.25),
-            EntityKind::Enderman => EntityDimensions::new(0.6, 2.9),
-            EntityKind::Endermite => EntityDimensions::new(0.4, 0.3),
+            EntityKind::Enderman => EntityDimensions::new(0.6, 2.9).eye_height(2.55),
+            EntityKind::Endermite => EntityDimensions::new(0.4, 0.3).eye_height(0.13),
             EntityKind::Evoker => EntityDimensions::new(0.6, 1.95),
             EntityKind::EvokerFangs => EntityDimensions::new(0.5, 0.8),
             EntityKind::ExperienceBottle => EntityDimensions::new(0.25, 0.25),
@@ -80,104 +112,120 @@ impl From<EntityKind> for EntityDimensions {
             EntityKind::Fireball => EntityDimensions::new(1.0, 1.0),
             EntityKind::FireworkRocket => EntityDimensions::new(0.25, 0.25),
             EntityKind::FishingBobber => EntityDimensions::new(0.25, 0.25),
-            EntityKind::Fox => EntityDimensions::new(0.6, 0.7),
+            EntityKind::Fox => EntityDimensions::new(0.6, 0.7).eye_height(0.4),
             EntityKind::Frog => EntityDimensions::new(0.5, 0.5),
             EntityKind::FurnaceMinecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::Ghast => EntityDimensions::new(4.0, 4.0),
-            EntityKind::Giant => EntityDimensions::new(3.6, 12.0),
-            EntityKind::GlowItemFrame => EntityDimensions::new(0.5, 0.5),
-            EntityKind::GlowSquid => EntityDimensions::new(0.8, 0.8),
+            EntityKind::Ghast => EntityDimensions::new(4.0, 4.0).eye_height(2.6),
+            EntityKind::Giant => EntityDimensions::new(3.6, 12.0).eye_height(10.44),
+            EntityKind::GlowItemFrame => EntityDimensions::new(0.5, 0.5).eye_height(0.0),
+            EntityKind::GlowSquid => EntityDimensions::new(0.8, 0.8).eye_height(0.4),
             EntityKind::Goat => EntityDimensions::new(0.9, 1.3),
-            EntityKind::Guardian => EntityDimensions::new(0.85, 0.85),
-            EntityKind::HappyGhast => EntityDimensions::new(4.0, 4.0),
+            EntityKind::Guardian => EntityDimensions::new(0.85, 0.85).eye_height(0.425),
+            EntityKind::HappyGhast => EntityDimensions::new(4.0, 4.0).eye_height(2.6),
             EntityKind::Hoglin => EntityDimensions::new(1.39648, 1.4),
             EntityKind::HopperMinecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::Horse => EntityDimensions::new(1.39648, 1.6),
-            EntityKind::Husk => EntityDimensions::new(0.6, 1.95),
+            EntityKind::Horse => EntityDimensions::new(1.39648, 1.6).eye_height(1.52),
+            EntityKind::Husk => EntityDimensions::new(0.6, 1.95).eye_height(1.74),
             EntityKind::Illusioner => EntityDimensions::new(0.6, 1.95),
             EntityKind::Interaction => EntityDimensions::new(0.0, 0.0),
             EntityKind::IronGolem => EntityDimensions::new(1.4, 2.7),
-            EntityKind::Item => EntityDimensions::new(0.25, 0.25),
+            EntityKind::Item => EntityDimensions::new(0.25, 0.25).eye_height(0.2125),
             EntityKind::ItemDisplay => EntityDimensions::new(0.0, 0.0),
-            EntityKind::ItemFrame => EntityDimensions::new(0.5, 0.5),
-            EntityKind::JungleBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::JungleChestBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::LeashKnot => EntityDimensions::new(0.375, 0.5),
+            EntityKind::ItemFrame => EntityDimensions::new(0.5, 0.5).eye_height(0.0),
+            EntityKind::JungleBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::JungleChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::LeashKnot => EntityDimensions::new(0.375, 0.5).eye_height(0.0625),
             EntityKind::LightningBolt => EntityDimensions::new(0.0, 0.0),
             EntityKind::LingeringPotion => EntityDimensions::new(0.25, 0.25),
-            EntityKind::Llama => EntityDimensions::new(0.9, 1.87),
+            EntityKind::Llama => EntityDimensions::new(0.9, 1.87).eye_height(1.7765),
             EntityKind::LlamaSpit => EntityDimensions::new(0.25, 0.25),
-            EntityKind::MagmaCube => EntityDimensions::new(0.52, 0.52),
-            EntityKind::MangroveBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::MangroveChestBoat => EntityDimensions::new(1.375, 0.5625),
+            EntityKind::MagmaCube => EntityDimensions::new(0.52, 0.52).eye_height(0.325),
+            EntityKind::MangroveBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::MangroveChestBoat => {
+                EntityDimensions::new(1.375, 0.5625).eye_height(0.5625)
+            }
             EntityKind::Marker => EntityDimensions::new(0.0, 0.0),
             EntityKind::Minecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::Mooshroom => EntityDimensions::new(0.9, 1.4),
-            EntityKind::Mule => EntityDimensions::new(1.39648, 1.6),
-            EntityKind::OakBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::OakChestBoat => EntityDimensions::new(1.375, 0.5625),
+            EntityKind::Mooshroom => EntityDimensions::new(0.9, 1.4).eye_height(1.3),
+            EntityKind::Mule => EntityDimensions::new(1.39648, 1.6).eye_height(1.52),
+            EntityKind::OakBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::OakChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
             EntityKind::Ocelot => EntityDimensions::new(0.6, 0.7),
             EntityKind::OminousItemSpawner => EntityDimensions::new(0.25, 0.25),
             EntityKind::Painting => EntityDimensions::new(0.5, 0.5),
-            EntityKind::PaleOakBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::PaleOakChestBoat => EntityDimensions::new(1.375, 0.5625),
+            EntityKind::PaleOakBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::PaleOakChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
             EntityKind::Panda => EntityDimensions::new(1.3, 1.25),
-            EntityKind::Parrot => EntityDimensions::new(0.5, 0.9),
-            EntityKind::Phantom => EntityDimensions::new(0.9, 0.5),
+            EntityKind::Parrot => EntityDimensions::new(0.5, 0.9).eye_height(0.54),
+            EntityKind::Phantom => EntityDimensions::new(0.9, 0.5).eye_height(0.175),
             EntityKind::Pig => EntityDimensions::new(0.9, 0.9),
-            EntityKind::Piglin => EntityDimensions::new(0.6, 1.95),
-            EntityKind::PiglinBrute => EntityDimensions::new(0.6, 1.95),
+            EntityKind::Piglin => EntityDimensions::new(0.6, 1.95).eye_height(1.79),
+            EntityKind::PiglinBrute => EntityDimensions::new(0.6, 1.95).eye_height(1.79),
             EntityKind::Pillager => EntityDimensions::new(0.6, 1.95),
-            EntityKind::Player => EntityDimensions::new(0.6, 1.8),
+            EntityKind::Player => EntityDimensions::new(0.6, 1.8).eye_height(1.62),
             EntityKind::PolarBear => EntityDimensions::new(1.4, 1.4),
-            EntityKind::Pufferfish => EntityDimensions::new(0.7, 0.7),
+            EntityKind::Pufferfish => EntityDimensions::new(0.7, 0.7).eye_height(0.455),
             EntityKind::Rabbit => EntityDimensions::new(0.4, 0.5),
             EntityKind::Ravager => EntityDimensions::new(1.95, 2.2),
-            EntityKind::Salmon => EntityDimensions::new(0.7, 0.4),
-            EntityKind::Sheep => EntityDimensions::new(0.9, 1.3),
-            EntityKind::Shulker => EntityDimensions::new(1.0, 1.0),
+            EntityKind::Salmon => EntityDimensions::new(0.7, 0.4).eye_height(0.26),
+            EntityKind::Sheep => EntityDimensions::new(0.9, 1.3).eye_height(1.235),
+            EntityKind::Shulker => EntityDimensions::new(1.0, 1.0).eye_height(0.5),
             EntityKind::ShulkerBullet => EntityDimensions::new(0.3125, 0.3125),
-            EntityKind::Silverfish => EntityDimensions::new(0.4, 0.3),
-            EntityKind::Skeleton => EntityDimensions::new(0.6, 1.99),
-            EntityKind::SkeletonHorse => EntityDimensions::new(1.39648, 1.6),
-            EntityKind::Slime => EntityDimensions::new(0.52, 0.52),
+            EntityKind::Silverfish => EntityDimensions::new(0.4, 0.3).eye_height(0.13),
+            EntityKind::Skeleton => EntityDimensions::new(0.6, 1.99).eye_height(1.74),
+            EntityKind::SkeletonHorse => EntityDimensions::new(1.39648, 1.6).eye_height(1.52),
+            EntityKind::Slime => EntityDimensions::new(0.52, 0.52).eye_height(0.325),
             EntityKind::SmallFireball => EntityDimensions::new(0.3125, 0.3125),
-            EntityKind::Sniffer => EntityDimensions::new(1.9, 1.75),
-            EntityKind::SnowGolem => EntityDimensions::new(0.7, 1.9),
+            EntityKind::Sniffer => EntityDimensions::new(1.9, 1.75).eye_height(1.05),
+            EntityKind::SnowGolem => EntityDimensions::new(0.7, 1.9).eye_height(1.7),
             EntityKind::Snowball => EntityDimensions::new(0.25, 0.25),
             EntityKind::SpawnerMinecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::SpectralArrow => EntityDimensions::new(0.5, 0.5),
-            EntityKind::Spider => EntityDimensions::new(1.4, 0.9),
+            EntityKind::SpectralArrow => EntityDimensions::new(0.5, 0.5).eye_height(0.13),
+            EntityKind::Spider => EntityDimensions::new(1.4, 0.9).eye_height(0.65),
             EntityKind::SplashPotion => EntityDimensions::new(0.25, 0.25),
-            EntityKind::SpruceBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::SpruceChestBoat => EntityDimensions::new(1.375, 0.5625),
-            EntityKind::Squid => EntityDimensions::new(0.8, 0.8),
-            EntityKind::Stray => EntityDimensions::new(0.6, 1.99),
+            EntityKind::SpruceBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::SpruceChestBoat => EntityDimensions::new(1.375, 0.5625).eye_height(0.5625),
+            EntityKind::Squid => EntityDimensions::new(0.8, 0.8).eye_height(0.4),
+            EntityKind::Stray => EntityDimensions::new(0.6, 1.99).eye_height(1.74),
             EntityKind::Strider => EntityDimensions::new(0.9, 1.7),
-            EntityKind::Tadpole => EntityDimensions::new(0.4, 0.3),
+            EntityKind::Tadpole => EntityDimensions::new(0.4, 0.3).eye_height(0.195),
             EntityKind::TextDisplay => EntityDimensions::new(0.0, 0.0),
-            EntityKind::Tnt => EntityDimensions::new(0.98, 0.98),
+            EntityKind::Tnt => EntityDimensions::new(0.98, 0.98).eye_height(0.15),
             EntityKind::TntMinecart => EntityDimensions::new(0.98, 0.7),
-            EntityKind::TraderLlama => EntityDimensions::new(0.9, 1.87),
-            EntityKind::Trident => EntityDimensions::new(0.5, 0.5),
-            EntityKind::TropicalFish => EntityDimensions::new(0.5, 0.4),
+            EntityKind::TraderLlama => EntityDimensions::new(0.9, 1.87).eye_height(1.7765),
+            EntityKind::Trident => EntityDimensions::new(0.5, 0.5).eye_height(0.13),
+            EntityKind::TropicalFish => EntityDimensions::new(0.5, 0.4).eye_height(0.26),
             EntityKind::Turtle => EntityDimensions::new(1.2, 0.4),
-            EntityKind::Vex => EntityDimensions::new(0.4, 0.8),
-            EntityKind::Villager => EntityDimensions::new(0.6, 1.95),
+            EntityKind::Vex => EntityDimensions::new(0.4, 0.8).eye_height(0.51875),
+            EntityKind::Villager => EntityDimensions::new(0.6, 1.95).eye_height(1.62),
             EntityKind::Vindicator => EntityDimensions::new(0.6, 1.95),
-            EntityKind::WanderingTrader => EntityDimensions::new(0.6, 1.95),
+            EntityKind::WanderingTrader => EntityDimensions::new(0.6, 1.95).eye_height(1.62),
             EntityKind::Warden => EntityDimensions::new(0.9, 2.9),
-            EntityKind::WindCharge => EntityDimensions::new(0.3125, 0.3125),
-            EntityKind::Witch => EntityDimensions::new(0.6, 1.95),
+            EntityKind::WindCharge => EntityDimensions::new(0.3125, 0.3125).eye_height(0.0),
+            EntityKind::Witch => EntityDimensions::new(0.6, 1.95).eye_height(1.62),
             EntityKind::Wither => EntityDimensions::new(0.9, 3.5),
-            EntityKind::WitherSkeleton => EntityDimensions::new(0.7, 2.4),
+            EntityKind::WitherSkeleton => EntityDimensions::new(0.7, 2.4).eye_height(2.1),
             EntityKind::WitherSkull => EntityDimensions::new(0.3125, 0.3125),
-            EntityKind::Wolf => EntityDimensions::new(0.6, 0.85),
+            EntityKind::Wolf => EntityDimensions::new(0.6, 0.85).eye_height(0.68),
             EntityKind::Zoglin => EntityDimensions::new(1.39648, 1.4),
-            EntityKind::Zombie => EntityDimensions::new(0.6, 1.95),
-            EntityKind::ZombieHorse => EntityDimensions::new(1.39648, 1.6),
-            EntityKind::ZombieVillager => EntityDimensions::new(0.6, 1.95),
-            EntityKind::ZombifiedPiglin => EntityDimensions::new(0.6, 1.95),
+            EntityKind::Zombie => EntityDimensions::new(0.6, 1.95).eye_height(1.74),
+            EntityKind::ZombieHorse => EntityDimensions::new(1.39648, 1.6).eye_height(1.52),
+            EntityKind::ZombieVillager => EntityDimensions::new(0.6, 1.95).eye_height(1.74),
+            EntityKind::ZombifiedPiglin => EntityDimensions::new(0.6, 1.95).eye_height(1.79),
         }
     }
 }
+
+/// Calculate the dimensions that an entity with the given kind and pose would
+/// have.i
+pub fn calculate_dimensions(kind: EntityKind, pose: Pose) -> EntityDimensions {
+    match (kind, pose) {
+        (_, Pose::Sleeping) => EntityDimensions::new(0.2, 0.2).fixed().eye_height(0.2),
+        (EntityKind::Player, Pose::FallFlying) => EntityDimensions::new(0.6, 0.6).eye_height(0.4),
+        (EntityKind::Player, Pose::Swimming) => EntityDimensions::new(0.6, 0.6).eye_height(0.4),
+        (EntityKind::Player, Pose::SpinAttack) => EntityDimensions::new(0.6, 0.6).eye_height(0.4),
+        (EntityKind::Player, Pose::Crouching) => EntityDimensions::new(0.6, 1.5).eye_height(1.27),
+        (EntityKind::Player, Pose::Dying) => EntityDimensions::new(0.2, 1.2).eye_height(1.62),
+        _ => EntityDimensions::from(kind),
+    }
+}