Match living entity input, climbing and air travel phases

2026-11-07 02:56:17 -10:00 · 2026-10-07 02:28:48 +02:00
1 parent 921f092c0f
commit b43c468a6f
@@ -0,0 +1,226 @@
+{
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+    "crates/horizon-world/src/worldgen/biome_source.rs": "e181e1736f3e0b75f7091a24c88de3fd116e01b98424d02382aea7a503d1eb54",
+    "crates/horizon-world/src/worldgen/biome_temperature.rs": "cde4bbab5e260c4065b113376c423b8511ade93c5aa5fd976e245ee8a58b5ad1",
+    "crates/horizon-world/src/worldgen/biome_weather.rs": "96b1f9494559ed31d06257b83d604d00cc069ccc8c7b68094117e034b4a71bd7",
+    "crates/horizon-world/src/worldgen/block_blob.rs": "c608c57b3d77279646ecb89e50677dd8e452b0422ffd357ba755536c5589eb89",
+    "crates/horizon-world/src/worldgen/block_column.rs": "f72c21a9066ee0aa68c2fb79fba436d05afb14c6ef5a2cb012f1ed35fc17cd22",
+    "crates/horizon-world/src/worldgen/block_feature.rs": "36b4e46ee7f7f73bcb94d8bce8d99013e4b16234c9a03542eeb3186e88dd1c21",
+    "crates/horizon-world/src/worldgen/block_pile.rs": "623e369b77e0526ed2756485a6c0bb09683cd28ad8876dea907360ca6665b39d",
+    "crates/horizon-world/src/worldgen/block_predicate.rs": "074c692367e3f2191a1bb28d87b23402430a843c246bd30a4ea838ee3500280e",
+    "crates/horizon-world/src/worldgen/blue_ice.rs": "eedd77bdaff808330b864166d303378096daa5c7d235e925770b171c05109247",
+    "crates/horizon-world/src/worldgen/bonus_chest.rs": "05d0f63fbc7412f13ba1fa37a7238114b8f70bfff318beb2dece590482d49cc0",
+    "crates/horizon-world/src/worldgen/bulk_section.rs": "eecf61532d7793f853884c5a18a7f436a59835c7b13d3ec9075804511553c9ba",
+    "crates/horizon-world/src/worldgen/carver/canyon.rs": "509c4d5a9d689849e98e894ab14a9fbf82d10707d38e9cc688ded3c4778df3e2",
+    "crates/horizon-world/src/worldgen/carver/generation.rs": "a4498d0d1457536de3922a08e9c40ccce8d2ef9cc263801c15a412327513c098",
+    "crates/horizon-world/src/worldgen/carver.rs": "46b251e28225fe1250de38f49dec5dacda4e2c4ba1e556e21e6d1e14e2651fc3",
+    "crates/horizon-world/src/worldgen/carving.rs": "4e77d4e5c4a0ca55ca3563b9bdf6f379342e0bdf9d019d60f7bc57ce4afb5fbd",
+    "crates/horizon-world/src/worldgen/chorus_plant.rs": "29224c164ede919e280a65a68f155c873e2c8fd0aa7d7e244d8fa9e468760250",
+    "crates/horizon-world/src/worldgen/climate/codec.rs": "d567adeb5d837816fca69102db51d790f71aec1b51c09298230d24612e400a14",
+    "crates/horizon-world/src/worldgen/climate/index.rs": "c5ce61679a5f0e0f2f0af2a373424effa124d0cce8250609eff38b7034650756",
+    "crates/horizon-world/src/worldgen/climate.rs": "1b9ad44407f40aee4c1cd5357a5c9c443c1b105728f01cf5c644072f99f8357e",
+    "crates/horizon-world/src/worldgen/decoration.rs": "75a79b20b21e133816e729f16e758be6165d0db18a64bfbd5fd3618325a2adf3",
+    "crates/horizon-world/src/worldgen/delta.rs": "c2bf49ddf3231d28c109e68871429bc13d76a7bebe14eb33e84aa856bdd66145",
+    "crates/horizon-world/src/worldgen/density.rs": "65a98c156a290a6b374ef670d28cd5dfbe0aa93171824d1bbd96422536273f84",
+    "crates/horizon-world/src/worldgen/disk.rs": "6f8f9e059755af44c9bfa1b91eba54a7d13fad811dce31717c5502d7f6df33d7",
+    "crates/horizon-world/src/worldgen/end_gateway.rs": "f53fde77d6a36a525cd15d890003b2c129d0689a4cbfa2cf443a0c2e3acae040",
+    "crates/horizon-world/src/worldgen/end_podium.rs": "8f6d0d6d60ff0fde63de5781e867239db321f82cf12639f0537d410a3731ee1d",
+    "crates/horizon-world/src/worldgen/feature.rs": "40500af71ee6628dfb27518262d99f08d0383ae6c7b9397452feef0c213eadd9",
+    "crates/horizon-world/src/worldgen/feature_catalog.rs": "efc7b17b227e71622ef34108be9abd010f5675b68ea0409fcab82581d9aab88a",
+    "crates/horizon-world/src/worldgen/feature_graph.rs": "da132fca9fdafb0d89a917d5f4b68c60b70fb33cadf948a107da0e35d83dcd91",
+    "crates/horizon-world/src/worldgen/feature_region.rs": "df0ff142a461cafa9a3b42b949ad3376887f2be8d4ea5cc794a3ed2e977bb499",
+    "crates/horizon-world/src/worldgen/feature_sort.rs": "3488a093dfe1321aaa29d8a30cfb115d8e666a81bf195514e87b170de626835c",
+    "crates/horizon-world/src/worldgen/fluid_predicate.rs": "64197c9e63bebf1ce04bc280bfe980bb6c1b9aa887ca5cded904aeb0d9ae6c46",
+    "crates/horizon-world/src/worldgen/height_provider.rs": "368d4dc119854742a045c4a717679c921456da681fc5f71aa9b37102d6f33b47",
+    "crates/horizon-world/src/worldgen/material_condition/codec.rs": "09b909bc384472f76d163c8069ec6b507c7d5c6a028a36d5e0e3df20deff7b3b",
+    "crates/horizon-world/src/worldgen/material_condition/density.rs": "df9d0761e978e5010663ae8b44f2d6c1ecb4907331e333bdb6a2b487c1e107de",
+    "crates/horizon-world/src/worldgen/material_condition/library.rs": "a55534c5da97575a819af5a7dc0dbec9069993fa8b2619c6c9d5576946e683fa",
+    "crates/horizon-world/src/worldgen/material_condition/noise.rs": "ffb59cc6be2275d7a5621bf7d768527e74a8326ed7ad78618746711540921675",
+    "crates/horizon-world/src/worldgen/material_condition/rule.rs": "fed643352efbcb1f68f29b6241896617db889fc7c577a6247564e01922fec1fe",
+    "crates/horizon-world/src/worldgen/material_condition.rs": "d638dcb8cbcb5da20b3cb29602b0ae6a86c4fdf9d8c0fb725de8ec5fc108717e",
+    "crates/horizon-world/src/worldgen/material_extensions.rs": "ab806eb679d5116e1aebb64fca70e1499ae71f83c9507a8cb4c3201c2b1bf037",
+    "crates/horizon-world/src/worldgen/material_stage.rs": "698cbc786eff13c246e2bc2ea062401918cd4265899fbc3d53abc87e45a8e7a1",
+    "crates/horizon-world/src/worldgen/material_surface.rs": "5d37b90099df3d6da0845dab164e71469fb287019c2ee74bc6714f3b9d6d6d5b",
+    "crates/horizon-world/src/worldgen/ore_feature.rs": "83b89fd3be691c5412c0215b6abefdcaa44119a05aa41217e061970eb7e12ebd",
+    "crates/horizon-world/src/worldgen/placement/chain.rs": "9218399b4d3757f7bbc550d7729a7201f32a1c83a7030865e0c12aab8a80d116",
+    "crates/horizon-world/src/worldgen/placement/context.rs": "a278304795136677ad4b4933ea50c972b9729a1c671c03fa309c193e224b1fd6",
+    "crates/horizon-world/src/worldgen/placement/layer.rs": "a0f5ca776f33f9d4f72b8fdcd163426152e5e43cb4a7572fc1d4fc57bf965de1",
+    "crates/horizon-world/src/worldgen/placement.rs": "b0397e5818fae84358546193a95f84bcb0b5bffafce909e6fcb3386179ee8023",
+    "crates/horizon-world/src/worldgen/replace_blobs.rs": "bf3377d86d2570cd15288ba69dde64a2cf67c5bcbb9a31d0c23421964af74afa",
+    "crates/horizon-world/src/worldgen/router.rs": "2cee7cf15a0d2ada12be6b39d83e78177fd3033922e4f4cce87a64073cec2847",
+    "crates/horizon-world/src/worldgen/rule_test.rs": "d1662ec492489ebaa4b87e20f9a8c809dcf3a223a151211bd65ec241a63692fc",
+    "crates/horizon-world/src/worldgen/settings.rs": "a8fe87752e1982ef11cb67f8d80d8e3428b2c27db178044cb425ba803e689e59",
+    "crates/horizon-world/src/worldgen/simple_block.rs": "9ba1a88d5db4925f8c37366557887f776c805f9a6444781615b5dbaff52e92a4",
+    "crates/horizon-world/src/worldgen/snow_freeze.rs": "9040be3d5c7f8f0fd812d2df45e154bf8a9eeef038530b83fa4159d246eac35f",
+    "crates/horizon-world/src/worldgen/speleothem.rs": "c71651c1c97818a8a85863e14414d6139ea3bdeb897fa422043bcc1499d99aae",
+    "crates/horizon-world/src/worldgen/spike.rs": "eacf0d9d3d2bc3d4bcf62bc87555f90031138236a5bfef0eb5270204f7c2a4fc",
+    "crates/horizon-world/src/worldgen/spring.rs": "830849e9b89fcdf09e9b06fbefdcdebe3c8c3f82804f60b8bd5de04ba303cb62",
+    "crates/horizon-world/src/worldgen/state_provider/catalog.rs": "c8687e15a4887a9200c8d365857d801efaa8f90e669eee3e600a1db4905119eb",
+    "crates/horizon-world/src/worldgen/state_provider/noise.rs": "7ee369c2a032e5620cb9bdf9ee7adad1f70870fb0a27efb7b7c514d92f83491f",
+    "crates/horizon-world/src/worldgen/state_provider/properties.rs": "9909139aaca1dc4f743957257fadaa9d423d21fa401fa9abc050505f79365139",
+    "crates/horizon-world/src/worldgen/state_provider.rs": "be29ada818826a90afe01ab60916360fdfc4cbde5af15c9359cd56b1f1f7b156",
+    "crates/horizon-world/src/worldgen/tags.rs": "d35ded93fe6e95ea045cadcf4925e656dc34ef832b742179b9ad0cc49f902f31",
+    "crates/horizon-world/src/worldgen/terrain.rs": "fd1f2e0afc15daf66f484ea40a1f2b7013650bda0941b23c64c81ee9f79cb673",
+    "crates/horizon-world/src/worldgen/underwater_magma.rs": "7317e40af5ee5a9780f90ce358fa5d3e7f5b3d513b731df6ff97754d9c2a0154",
+    "crates/horizon-world/src/worldgen/value_provider.rs": "3358b563db8cb0bc8a9cfbbe2b8b3e70941cd2d37a0b519fbb6545f8d0dcbb69",
+    "crates/horizon-world/src/worldgen/vines.rs": "ee9b79b65012bd86a838241d2ef708680f7fe8eafc8aa656dae9cf2abf3c6418",
+    "crates/horizon-world/src/worldgen/weighted.rs": "839840aae25302933bbd97a81a2336330e2d03a0ad1684e1e16ac769ed408e6b",
+    "crates/horizon-world/src/worldgen/write_zone.rs": "8e17a179764d3f68c05882aef35f6810c28a0000f9a83e58bd6030660b76e64e",
+    "crates/horizon-world/src/worldgen.rs": "e8e9f099ee1fcec8eedce31805d676d3f89c18e84f494a147ffcbfee23d3d54f",
+    "crates/horizon-world/examples/living_air_fixture.rs": "4736e209a6772840a953b1aabd736cbc4eef064b9658300aa152f081345190c1"
+  },
+  "fixtures_sha256": {
+    ".local/rust-living-air-parity/inputs.txt": "975ea006fdc523f37ccef52b654630ed653a0766ab1a5faf0b006f829bc73618"
+  },
+  "rust_output_sha256": "c1f207978d91c4ee96a148c47f1a5962270d0272b0c9aa9f7829714821bc511c",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "c1f207978d91c4ee96a148c47f1a5962270d0272b0c9aa9f7829714821bc511c",
+      "matched_output_lines": 443554
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "c1f207978d91c4ee96a148c47f1a5962270d0272b0c9aa9f7829714821bc511c",
+      "matched_output_lines": 443554
+    }
+  ],
+  "scope": "Actual LivingEntity.travelInAir, handleRelativeFrictionAndCalculateMovement, handleOnClimbable, getFrictionInfluencedSpeed, computeModifiedFriction and Entity.getInputVector. Traces native moveRelative and state writes, both Player/nonplayer ladder guards, registered scaffolding/boots checks, levitation, missing client chunks, float friction/drag, callback mutations and failures. Entity.move, effective gravity, ground/climb predicates and attributes use controlled providers; live world integration and complete player travel remain pending."
+}
@@ -0,0 +1,246 @@
+use horizon_core::{geometry::Vec3, position::BlockPos};
+use horizon_world::living_air::*;
+use serde_json::Value;
+use std::{
+    fs,
+    io::{self, Write},
+    path::Path,
+};
+fn number(v: &Value) -> f64 {
+    f64::from_bits(u64::from_str_radix(v.as_str().unwrap(), 16).unwrap())
+}
+fn single(v: &Value) -> f32 {
+    f32::from_bits(u32::from_str_radix(v.as_str().unwrap(), 16).unwrap())
+}
+fn vec(v: &Value) -> Vec3 {
+    Vec3::new(number(&v[0]), number(&v[1]), number(&v[2]))
+}
+fn bits(v: f64) -> u64 {
+    if v.is_nan() {
+        0x7ff8000000000000
+    } else {
+        v.to_bits()
+    }
+}
+fn fbits(v: f32) -> u32 {
+    if v.is_nan() { 0x7fc00000 } else { v.to_bits() }
+}
+fn vector(v: Vec3) -> String {
+    format!("{:016x} {:016x} {:016x}", bits(v.x), bits(v.y), bits(v.z))
+}
+struct World<'a> {
+    f: &'a Value,
+    out: &'a mut dyn Write,
+    calls: i64,
+    ground_calls: usize,
+    climb_calls: usize,
+    velocity: Vec3,
+    fall: f64,
+    moved: bool,
+}
+impl World<'_> {
+    fn flag(&self, k: &str) -> bool {
+        self.f[k].as_bool().unwrap()
+    }
+    fn query(&mut self, s: impl AsRef<str>) -> io::Result<()> {
+        writeln!(self.out, "{}", s.as_ref())?;
+        let n = self.calls;
+        self.calls += 1;
+        if n == self.f["fail"].as_i64().unwrap() {
+            Err(io::Error::other("injected travel failure"))
+        } else {
+            Ok(())
+        }
+    }
+    fn sequence(&self, k: &str, n: usize) -> bool {
+        let a = self.f[k].as_array().unwrap();
+        a[n.min(a.len() - 1)].as_bool().unwrap()
+    }
+}
+impl LivingAirWorld for World<'_> {
+    type Error = io::Error;
+    fn movement_support_position(&mut self) -> io::Result<BlockPos> {
+        self.query("support")?;
+        Ok(BlockPos::new(17, -64, -33))
+    }
+    fn on_ground(&mut self) -> io::Result<bool> {
+        self.query("ground")?;
+        let b = self.sequence("ground", self.ground_calls);
+        self.ground_calls += 1;
+        Ok(b)
+    }
+    fn block_friction(&mut self, p: BlockPos) -> io::Result<f32> {
+        self.query(format!("state {} {} {}", p.x, p.y, p.z))?;
+        self.query("friction")?;
+        Ok(single(&self.f["friction"]))
+    }
+    fn friction_modifier(&mut self) -> io::Result<f64> {
+        self.query("friction-modifier")?;
+        Ok(number(&self.f["friction_modifier"]))
+    }
+    fn speed(&mut self) -> io::Result<f32> {
+        self.query("speed")?;
+        Ok(single(&self.f["speed"]))
+    }
+    fn flying_speed(&mut self) -> io::Result<f32> {
+        self.query("flying-speed")?;
+        Ok(single(&self.f["flying_speed"]))
+    }
+    fn yaw(&mut self) -> io::Result<f32> {
+        self.query("yaw")?;
+        if self.flag("yaw_mutate") {
+            self.velocity = Vec3::new(17.0, 18.0, 19.0);
+        }
+        Ok(single(&self.f["yaw"]))
+    }
+    fn velocity(&self) -> Vec3 {
+        self.velocity
+    }
+    fn set_velocity(&mut self, v: Vec3) -> io::Result<()> {
+        self.query(format!("set {}", vector(v)))?;
+        self.velocity = v;
+        Ok(())
+    }
+    fn on_climbable(&mut self) -> io::Result<bool> {
+        self.query("climb")?;
+        let b = self.sequence("climb", self.climb_calls);
+        self.climb_calls += 1;
+        Ok(b)
+    }
+    fn reset_fall_distance(&mut self) -> io::Result<()> {
+        self.query("reset")?;
+        self.fall = 0.0;
+        Ok(())
+    }
+    fn in_scaffolding(&mut self) -> io::Result<bool> {
+        self.query("in-block")?;
+        Ok(self.flag("scaffolding"))
+    }
+    fn suppressing_ladder_slide(&mut self) -> io::Result<bool> {
+        self.query("suppress")?;
+        Ok(self.flag("suppress"))
+    }
+    fn is_player_class(&self) -> bool {
+        self.flag("player")
+    }
+    fn move_self(&mut self, v: Vec3) -> io::Result<()> {
+        self.query(format!("move {}", vector(v)))?;
+        self.moved = true;
+        if self.flag("move_mutate") {
+            self.velocity = vec(&self.f["after_velocity"]);
+        }
+        Ok(())
+    }
+    fn horizontal_collision(&self) -> bool {
+        self.flag(if self.moved {
+            "after_horizontal"
+        } else {
+            "horizontal"
+        })
+    }
+    fn jumping(&self) -> bool {
+        self.flag(if self.moved {
+            "after_jumping"
+        } else {
+            "jumping"
+        })
+    }
+    fn was_in_powder_snow(&self) -> bool {
+        self.flag(if self.moved { "after_snow" } else { "snow" })
+    }
+    fn can_walk_powder_snow(&mut self) -> io::Result<bool> {
+        self.query("powder-tag")?;
+        if self.flag("powder_tag") {
+            Ok(true)
+        } else {
+            self.query("feet")?;
+            Ok(self.flag("boots"))
+        }
+    }
+    fn levitation_amplifier(&mut self) -> io::Result<Option<i32>> {
+        self.query("levitation")?;
+        Ok(self.f["levitation"].as_i64().map(|v| v as i32))
+    }
+    fn is_client_side(&mut self) -> io::Result<bool> {
+        self.query("client")?;
+        Ok(self.flag("client"))
+    }
+    fn has_chunk_at(&mut self, p: BlockPos) -> io::Result<bool> {
+        self.query(format!("chunk {} {} {}", p.x, p.y, p.z))?;
+        Ok(self.flag("chunk"))
+    }
+    fn effective_gravity(&mut self) -> io::Result<f64> {
+        self.query("gravity")?;
+        Ok(number(&self.f["gravity"]))
+    }
+    fn y(&self) -> f64 {
+        number(&self.f["y"])
+    }
+    fn minimum_y(&mut self) -> io::Result<i32> {
+        self.query("min-y")?;
+        Ok(self.f["min_y"].as_i64().unwrap() as i32)
+    }
+    fn discard_friction(&mut self) -> io::Result<bool> {
+        self.query("discard")?;
+        Ok(self.flag("discard"))
+    }
+    fn air_drag_modifier(&mut self) -> io::Result<f64> {
+        self.query("drag-modifier")?;
+        Ok(number(&self.f["drag_modifier"]))
+    }
+    fn omnidirectional_air_mover(&mut self) -> io::Result<bool> {
+        self.query("omni")?;
+        Ok(self.flag("omni"))
+    }
+}
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let arg = std::env::args().nth(1).unwrap();
+    let dir = Path::new(&arg);
+    let mut out = io::BufWriter::new(fs::File::create(dir.join("rust.txt"))?);
+    for line in fs::read_to_string(dir.join("inputs.txt"))?.lines() {
+        let f: Value = serde_json::from_str(line)?;
+        let mut w = World {
+            f: &f,
+            out: &mut out,
+            calls: 0,
+            ground_calls: 0,
+            climb_calls: 0,
+            velocity: vec(&f["velocity"]),
+            fall: number(&f["fall"]),
+            moved: false,
+        };
+        let input = vec(&f["input"]);
+        let friction = single(&f["friction"]);
+        let result: io::Result<()> = match f["mode"].as_str().unwrap() {
+            "air" => travel_in_air(&mut w, input),
+            "relative" => relative_friction_movement(&mut w, input, friction)
+                .and_then(|v| writeln!(w.out, "vector {}", vector(v))),
+            "climb" => handle_on_climbable(&mut w, input)
+                .and_then(|v| writeln!(w.out, "vector {}", vector(v))),
+            "speed" => friction_influenced_speed(&mut w, friction)
+                .and_then(|v| writeln!(w.out, "float {:08x}", fbits(v))),
+            "input" => writeln!(
+                w.out,
+                "vector {}",
+                vector(input_vector(input, single(&f["speed"]), single(&f["yaw"])))
+            ),
+            "friction" => writeln!(
+                w.out,
+                "float {:08x}",
+                fbits(modified_friction(
+                    friction,
+                    number(&f["friction_modifier"]) as f32
+                ))
+            ),
+            _ => panic!("unknown mode"),
+        };
+        writeln!(
+            w.out,
+            "result {}",
+            if result.is_ok() { "ok" } else { "error" }
+        )?;
+        writeln!(w.out, "final {} {:016x}", vector(w.velocity), bits(w.fall))?;
+        writeln!(w.out, "queries {}", w.calls)?;
+    }
+    Ok(())
+}
@@ -28,6 +28,7 @@ pub mod ground_support;
 pub mod heightmap;
 pub mod interaction_shapes;
 pub mod liquid_collision;
+pub mod living_air;
 pub mod living_fall;
 pub mod living_landing;
 pub mod movement_emission;
@@ -0,0 +1,171 @@
+//! LivingEntity walking, climbing and airborne velocity integration.
+use horizon_core::{
+    geometry::{Vec3, trig},
+    position::BlockPos,
+};
+
+pub trait LivingAirWorld {
+    type Error;
+    fn movement_support_position(&mut self) -> Result<BlockPos, Self::Error>;
+    fn on_ground(&mut self) -> Result<bool, Self::Error>;
+    fn block_friction(&mut self, position: BlockPos) -> Result<f32, Self::Error>;
+    fn friction_modifier(&mut self) -> Result<f64, Self::Error>;
+    fn speed(&mut self) -> Result<f32, Self::Error>;
+    /// Includes entity-type overrides (notably Player).
+    fn flying_speed(&mut self) -> Result<f32, Self::Error>;
+    fn yaw(&mut self) -> Result<f32, Self::Error>;
+    fn velocity(&self) -> Vec3;
+    fn set_velocity(&mut self, velocity: Vec3) -> Result<(), Self::Error>;
+    fn on_climbable(&mut self) -> Result<bool, Self::Error>;
+    fn reset_fall_distance(&mut self) -> Result<(), Self::Error>;
+    fn in_scaffolding(&mut self) -> Result<bool, Self::Error>;
+    fn suppressing_ladder_slide(&mut self) -> Result<bool, Self::Error>;
+    fn is_player_class(&self) -> bool;
+    /// Bind to Entity.move(SELF, movement), including collision and landing.
+    fn move_self(&mut self, movement: Vec3) -> Result<(), Self::Error>;
+    fn horizontal_collision(&self) -> bool;
+    fn jumping(&self) -> bool;
+    fn was_in_powder_snow(&self) -> bool;
+    fn can_walk_powder_snow(&mut self) -> Result<bool, Self::Error>;
+    fn levitation_amplifier(&mut self) -> Result<Option<i32>, Self::Error>;
+    fn is_client_side(&mut self) -> Result<bool, Self::Error>;
+    fn has_chunk_at(&mut self, position: BlockPos) -> Result<bool, Self::Error>;
+    fn effective_gravity(&mut self) -> Result<f64, Self::Error>;
+    fn y(&self) -> f64;
+    fn minimum_y(&mut self) -> Result<i32, Self::Error>;
+    fn discard_friction(&mut self) -> Result<bool, Self::Error>;
+    fn air_drag_modifier(&mut self) -> Result<f64, Self::Error>;
+    fn omnidirectional_air_mover(&mut self) -> Result<bool, Self::Error>;
+}
+
+pub fn modified_friction(friction: f32, modifier: f32) -> f32 {
+    (1.0 - (1.0 - friction) * modifier).clamp(0.0, 1.0)
+}
+/// Entity.getInputVector: normalize only above unit length, then rotate using
+/// the native float-angle sine table. Tiny input returns canonical positive zero.
+pub fn input_vector(input: Vec3, speed: f32, yaw: f32) -> Vec3 {
+    let length = input.length_squared();
+    if length < 1.0e-7 {
+        return Vec3::ZERO;
+    }
+    let input = if length > 1.0 {
+        input.normalize()
+    } else {
+        input
+    };
+    let input = input.scale(f64::from(speed));
+    let angle = f64::from(yaw * trig::DEG_TO_RAD);
+    let sin = f64::from(trig::sin(angle));
+    let cos = f64::from(trig::cos(angle));
+    Vec3::new(
+        input.x * cos - input.z * sin,
+        input.y,
+        input.z * cos + input.x * sin,
+    )
+}
+pub fn move_relative<W: LivingAirWorld>(
+    world: &mut W,
+    input: Vec3,
+    speed: f32,
+) -> Result<(), W::Error> {
+    let input = input_vector(input, speed, world.yaw()?);
+    let old = world.velocity();
+    world.set_velocity(Vec3::new(old.x + input.x, old.y + input.y, old.z + input.z))
+}
+pub fn handle_on_climbable<W: LivingAirWorld>(
+    world: &mut W,
+    mut velocity: Vec3,
+) -> Result<Vec3, W::Error> {
+    if world.on_climbable()? {
+        world.reset_fall_distance()?;
+        let limit = f64::from(0.15f32);
+        velocity.x = velocity.x.clamp(-limit, limit);
+        velocity.z = velocity.z.clamp(-limit, limit);
+        // Math.max must propagate NaN.
+        if !velocity.y.is_nan() {
+            velocity.y = velocity.y.max(-limit);
+        }
+        if velocity.y < 0.0
+            && !world.in_scaffolding()?
+            && world.suppressing_ladder_slide()?
+            && world.is_player_class()
+        {
+            velocity.y = 0.0;
+        }
+    }
+    Ok(velocity)
+}
+pub fn friction_influenced_speed<W: LivingAirWorld>(
+    world: &mut W,
+    friction: f32,
+) -> Result<f32, W::Error> {
+    if world.on_ground()? {
+        let speed = world.speed()?;
+        if f64::from(friction) > 0.6 {
+            Ok(speed * (0.21600002f32 / (friction * friction * friction)))
+        } else {
+            Ok(speed)
+        }
+    } else {
+        world.flying_speed()
+    }
+}
+pub fn relative_friction_movement<W: LivingAirWorld>(
+    world: &mut W,
+    input: Vec3,
+    friction: f32,
+) -> Result<Vec3, W::Error> {
+    let speed = friction_influenced_speed(world, friction)?;
+    move_relative(world, input, speed)?;
+    let velocity = handle_on_climbable(world, world.velocity())?;
+    world.set_velocity(velocity)?;
+    world.move_self(world.velocity())?;
+    let mut velocity = world.velocity();
+    if (world.horizontal_collision() || world.jumping())
+        && (world.on_climbable()?
+            || (world.was_in_powder_snow() && world.can_walk_powder_snow()?))
+    {
+        velocity.y = 0.2;
+    }
+    Ok(velocity)
+}
+/// Ground friction is captured before movement; drag and gravity are queried
+/// afterwards. This distinction preserves movement callbacks' field changes.
+pub fn travel_in_air<W: LivingAirWorld>(world: &mut W, input: Vec3) -> Result<(), W::Error> {
+    let support = world.movement_support_position()?;
+    let friction = if world.on_ground()? {
+        let friction = world.block_friction(support)?;
+        modified_friction(friction, world.friction_modifier()? as f32)
+    } else {
+        1.0
+    };
+    let mut velocity = relative_friction_movement(world, input, friction)?;
+    if let Some(amplifier) = world.levitation_amplifier()? {
+        velocity.y += (0.05 * f64::from(amplifier.wrapping_add(1)) - velocity.y) * 0.2;
+    } else if !world.is_client_side()? || world.has_chunk_at(support)? {
+        velocity.y -= world.effective_gravity()?;
+    } else {
+        let y = world.y();
+        velocity.y = if y > f64::from(world.minimum_y()?) {
+            -0.1
+        } else {
+            0.0
+        };
+    }
+    if !world.discard_friction()? {
+        let modifier = world.air_drag_modifier()? as f32;
+        let drag = modified_friction(0.91, modifier);
+        let horizontal = friction * drag;
+        let vertical = if world.omnidirectional_air_mover()? {
+            drag
+        } else {
+            modified_friction(0.98, modifier)
+        };
+        velocity = Vec3::new(
+            velocity.x * f64::from(horizontal),
+            velocity.y * f64::from(vertical),
+            velocity.z * f64::from(horizontal),
+        );
+    }
+    world.set_velocity(velocity)
+}
@@ -836,3 +836,21 @@ water changes, numeric boundaries, particle locations/counts, callback failures,
 field mutations and climbing cleanup. Targeted Clippy passes. Fluid immersion,
 changed-block enchantments, particle rendering and live gameplay binding remain
 pending; those providers are controlled by this gate.
+
+
+`living_air` implements input normalization/rotation, friction-influenced speed,
+ladder/scaffolding limits, relative movement, collision-triggered climbing and
+air travel. Ground friction is captured before movement while levitation,
+gravity and drag are sampled afterwards. Player class identity controls ladder
+slide suppression. Native float arithmetic and quantized trigonometry are kept.
+
+`python3 tools/test_living_air_parity.py` invokes the actual native private air,
+relative movement, climbing, speed, friction and input-vector methods. The
+[air travel report](../benchmarks/rust-living-air-2026-10-07/scoped-parity.json)
+records **443,554 matching lines per JAR**, including both player/nonplayer
+classes, changed ground/climbing predicates, missing client chunks, levitation,
+nonfinite boundaries, callback mutations and failures. Targeted Clippy passes.
+Extreme effect amplifiers are injected directly for integer-boundary checks;
+normal constructor clamping is outside this gate. Collision movement, gravity,
+attributes and immersion remain controlled providers; live gameplay binding and
+complete player travel are pending.
@@ -0,0 +1,84 @@
+package dev.horizonlab.parity;
+import com.google.gson.*;
+import java.io.*;import java.lang.reflect.*;import java.nio.file.*;import java.util.*;
+import net.minecraft.core.*;import net.minecraft.tags.*;import net.minecraft.world.entity.*;import net.minecraft.world.entity.ai.attributes.*;import net.minecraft.world.effect.*;import net.minecraft.world.item.*;import net.minecraft.world.level.block.*;import net.minecraft.world.level.block.state.*;import net.minecraft.world.phys.Vec3;
+/** Actual native private air travel, relative movement and climbing helpers. */
+public final class VanillaLivingAirOracle {
+    static ItemStack BOOTS;static Field amplifier;
+    static MobEffectInstance effect(Data d,Holder<MobEffect> type){if(d.f.get("levitation").isJsonNull())return null;var e=new MobEffectInstance(type,100,0);try{amplifier.setInt(e,d.f.get("levitation").getAsInt());}catch(ReflectiveOperationException ex){throw new AssertionError(ex);}return e;}
+    static final class Stop extends RuntimeException {}
+    static double number(JsonElement v){return Double.longBitsToDouble(Long.parseUnsignedLong(v.getAsString(),16));}
+    static float single(JsonElement v){return Float.intBitsToFloat(Integer.parseUnsignedInt(v.getAsString(),16));}
+    static Vec3 vec(JsonElement v){var a=v.getAsJsonArray();return new Vec3(number(a.get(0)),number(a.get(1)),number(a.get(2)));}
+    static String vector(Vec3 v){return String.format("%016x %016x %016x",Double.doubleToLongBits(v.x),Double.doubleToLongBits(v.y),Double.doubleToLongBits(v.z));}
+    static final class Data {JsonObject f;PrintWriter out;int calls,groundCalls,climbCalls;Vec3 velocity;
+        void query(String s){out.println(s);if(calls++==f.get("fail").getAsInt())throw new Stop();}
+        boolean flag(String k){return f.get(k).getAsBoolean();}
+        boolean sequence(String k,int n){var a=f.getAsJsonArray(k);return a.get(Math.min(n,a.size()-1)).getAsBoolean();}}
+    static final class FrictionBlock extends Block {Data d;FrictionBlock(){super(BlockBehaviour.Properties.of());}@Override public float getFriction(){d.query("friction");return single(d.f.get("friction"));}}
+    static final class State extends BlockState {Block block;State(){super(null,null,null);}@Override public Block getBlock(){return block;}}
+    static final class Level extends net.minecraft.server.level.ServerLevel {Data d;BlockState state;Level(){super(null,null,null,null,null,null,false,0L,List.of(),false);}
+        @Override public BlockState getBlockState(BlockPos p){d.query("state "+p.getX()+" "+p.getY()+" "+p.getZ());return state;}
+        @Override public boolean isClientSide(){d.query("client");return d.flag("client");}
+        @Override public boolean hasChunkAt(BlockPos p){d.query("chunk "+p.getX()+" "+p.getY()+" "+p.getZ());return d.flag("chunk");}
+        @Override public int getMinY(){d.query("min-y");return d.f.get("min_y").getAsInt();}}
+    static final class Actor extends net.minecraft.world.entity.decoration.ArmorStand {Actor(){super(null,null);}
+        Data d;
+        void configure(Level l){setLevel(l);}
+        @Override public BlockPos getBlockPosBelowThatAffectsMyMovement(){d.query("support");return new BlockPos(17,-64,-33);}
+        @Override public boolean onGround(){d.query("ground");return d.sequence("ground",d.groundCalls++);}
+        @Override public double getAttributeValue(Holder<Attribute> attribute){String n=attribute==Attributes.FRICTION_MODIFIER?"friction":attribute==Attributes.AIR_DRAG_MODIFIER?"drag":null;if(n==null)throw new AssertionError(attribute);d.query(n+"-modifier");return number(d.f.get(n+"_modifier"));}
+        @Override public float getSpeed(){d.query("speed");return single(d.f.get("speed"));}
+        @Override protected float getFlyingSpeed(){d.query("flying-speed");return single(d.f.get("flying_speed"));}
+        @Override public float getYRot(){d.query("yaw");if(d.flag("yaw_mutate"))d.velocity=new Vec3(17,18,19);return single(d.f.get("yaw"));}
+        @Override public Vec3 getDeltaMovement(){return d.velocity;}
+        @Override public void setDeltaMovement(Vec3 v){d.query("set "+vector(v));d.velocity=v;}
+        @Override public boolean onClimbable(){d.query("climb");return d.sequence("climb",d.climbCalls++);}
+        @Override public void resetFallDistance(){d.query("reset");fallDistance=0;}
+        @Override public BlockState getInBlockState(){d.query("in-block");return (d.flag("scaffolding")?Blocks.SCAFFOLDING:Blocks.STONE).defaultBlockState();}
+        @Override public boolean isSuppressingSlidingDownLadder(){d.query("suppress");return d.flag("suppress");}
+        @Override public void move(MoverType type,Vec3 v){if(type!=MoverType.SELF)throw new AssertionError(type);d.query("move "+vector(v));horizontalCollision=d.flag("after_horizontal");jumping=d.flag("after_jumping");wasInPowderSnow=d.flag("after_snow");if(d.flag("move_mutate"))d.velocity=vec(d.f.get("after_velocity"));}
+        @Override public boolean is(TagKey<EntityType<?>> tag){if(tag!=EntityTypeTags.POWDER_SNOW_WALKABLE_MOBS)throw new AssertionError(tag);d.query("powder-tag");return d.flag("powder_tag");}
+        @Override public ItemStack getItemBySlot(EquipmentSlot slot){if(slot!=EquipmentSlot.FEET)throw new AssertionError(slot);d.query("feet");return d.flag("boots")?BOOTS:ItemStack.EMPTY;}
+        @Override public MobEffectInstance getEffect(Holder<MobEffect> effect){if(effect!=MobEffects.LEVITATION)throw new AssertionError(effect);d.query("levitation");return effect(d,effect);}
+        @Override protected double getEffectiveGravity(){d.query("gravity");return number(d.f.get("gravity"));}
+        @Override public boolean shouldDiscardFriction(){d.query("discard");return d.flag("discard");}
+        @Override protected boolean omnidirectionalAirMover(){d.query("omni");return d.flag("omni");}
+    }
+    static final class Human extends net.minecraft.world.entity.player.Player {Human(){super(null,null);}
+        Data d;
+        void configure(Level l){setLevel(l);}
+        @Override public BlockPos getBlockPosBelowThatAffectsMyMovement(){d.query("support");return new BlockPos(17,-64,-33);}
+        @Override public boolean onGround(){d.query("ground");return d.sequence("ground",d.groundCalls++);}
+        @Override public double getAttributeValue(Holder<Attribute> attribute){String n=attribute==Attributes.FRICTION_MODIFIER?"friction":attribute==Attributes.AIR_DRAG_MODIFIER?"drag":null;if(n==null)throw new AssertionError(attribute);d.query(n+"-modifier");return number(d.f.get(n+"_modifier"));}
+        @Override public float getSpeed(){d.query("speed");return single(d.f.get("speed"));}
+        @Override protected float getFlyingSpeed(){d.query("flying-speed");return single(d.f.get("flying_speed"));}
+        @Override public float getYRot(){d.query("yaw");if(d.flag("yaw_mutate"))d.velocity=new Vec3(17,18,19);return single(d.f.get("yaw"));}
+        @Override public Vec3 getDeltaMovement(){return d.velocity;}
+        @Override public void setDeltaMovement(Vec3 v){d.query("set "+vector(v));d.velocity=v;}
+        @Override public boolean onClimbable(){d.query("climb");return d.sequence("climb",d.climbCalls++);}
+        @Override public void resetFallDistance(){d.query("reset");fallDistance=0;}
+        @Override public BlockState getInBlockState(){d.query("in-block");return (d.flag("scaffolding")?Blocks.SCAFFOLDING:Blocks.STONE).defaultBlockState();}
+        @Override public boolean isSuppressingSlidingDownLadder(){d.query("suppress");return d.flag("suppress");}
+        @Override public void move(MoverType type,Vec3 v){if(type!=MoverType.SELF)throw new AssertionError(type);d.query("move "+vector(v));horizontalCollision=d.flag("after_horizontal");jumping=d.flag("after_jumping");wasInPowderSnow=d.flag("after_snow");if(d.flag("move_mutate"))d.velocity=vec(d.f.get("after_velocity"));}
+        @Override public boolean is(TagKey<EntityType<?>> tag){if(tag!=EntityTypeTags.POWDER_SNOW_WALKABLE_MOBS)throw new AssertionError(tag);d.query("powder-tag");return d.flag("powder_tag");}
+        @Override public ItemStack getItemBySlot(EquipmentSlot slot){if(slot!=EquipmentSlot.FEET)throw new AssertionError(slot);d.query("feet");return d.flag("boots")?BOOTS:ItemStack.EMPTY;}
+        @Override public MobEffectInstance getEffect(Holder<MobEffect> effect){if(effect!=MobEffects.LEVITATION)throw new AssertionError(effect);d.query("levitation");return effect(d,effect);}
+        @Override protected double getEffectiveGravity(){d.query("gravity");return number(d.f.get("gravity"));}
+        @Override public boolean shouldDiscardFriction(){d.query("discard");return d.flag("discard");}
+        @Override protected boolean omnidirectionalAirMover(){d.query("omni");return d.flag("omni");}
+        @Override public net.minecraft.world.level.GameType gameMode(){return net.minecraft.world.level.GameType.SURVIVAL;}
+    }
+    static Method method(Class<?> owner,String name,Class<?>... args)throws Exception{var m=owner.getDeclaredMethod(name,args);m.setAccessible(true);return m;}
+    public static void main(String[] args)throws Exception{
+        net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();var u=Class.forName("sun.misc.Unsafe");var uf=u.getDeclaredField("theUnsafe");uf.setAccessible(true);var unsafe=uf.get(null);var allocate=u.getMethod("allocateInstance",Class.class);
+        amplifier=MobEffectInstance.class.getDeclaredField("amplifier");amplifier.setAccessible(true);BOOTS=(ItemStack)allocate.invoke(unsafe,ItemStack.class);var stackItem=ItemStack.class.getDeclaredField("item");stackItem.setAccessible(true);stackItem.set(BOOTS,Items.LEATHER_BOOTS.builtInRegistryHolder());var stackCount=ItemStack.class.getDeclaredField("count");stackCount.setAccessible(true);stackCount.setInt(BOOTS,1);
+        var air=method(LivingEntity.class,"travelInAir",Vec3.class);var relative=method(LivingEntity.class,"handleRelativeFrictionAndCalculateMovement",Vec3.class,float.class);var climb=method(LivingEntity.class,"handleOnClimbable",Vec3.class);var speed=method(LivingEntity.class,"getFrictionInfluencedSpeed",float.class);var input=method(Entity.class,"getInputVector",Vec3.class,float.class,float.class);var friction=method(LivingEntity.class,"computeModifiedFriction",float.class,float.class);var position=Entity.class.getDeclaredField("position");position.setAccessible(true);var jumping=LivingEntity.class.getDeclaredField("jumping");jumping.setAccessible(true);Path dir=Path.of(args[1]);
+        try(var out=new PrintWriter(Files.newBufferedWriter(dir.resolve(args[0]+".txt")));var lines=Files.lines(dir.resolve("inputs.txt"))){for(var line:(Iterable<String>)lines::iterator){
+            var f=JsonParser.parseString(line).getAsJsonObject();var d=new Data();d.f=f;d.out=out;d.velocity=vec(f.get("velocity"));var level=(Level)allocate.invoke(unsafe,Level.class);level.d=d;var block=(FrictionBlock)allocate.invoke(unsafe,FrictionBlock.class);block.d=d;var state=(State)allocate.invoke(unsafe,State.class);state.block=block;level.state=state;
+            LivingEntity entity;if(d.flag("player")){var e=(Human)allocate.invoke(unsafe,Human.class);e.d=d;e.configure(level);entity=e;}else{var e=(Actor)allocate.invoke(unsafe,Actor.class);e.d=d;e.configure(level);entity=e;}position.set(entity,new Vec3(0,number(f.get("y")),0));entity.fallDistance=number(f.get("fall"));entity.horizontalCollision=d.flag("horizontal");jumping.setBoolean(entity,d.flag("jumping"));entity.wasInPowderSnow=d.flag("snow");
+            try{Object result=switch(f.get("mode").getAsString()){case "air"->air.invoke(entity,vec(f.get("input")));case "relative"->relative.invoke(entity,vec(f.get("input")),single(f.get("friction")));case "climb"->climb.invoke(entity,vec(f.get("input")));case "speed"->speed.invoke(entity,single(f.get("friction")));case "input"->input.invoke(null,vec(f.get("input")),single(f.get("speed")),single(f.get("yaw")));case "friction"->friction.invoke(null,single(f.get("friction")),(float)number(f.get("friction_modifier")));default->throw new AssertionError();};if(result instanceof Vec3 v)out.println("vector "+vector(v));else if(result instanceof Float v)out.printf("float %08x%n",Float.floatToIntBits(v));out.println("result ok");}catch(InvocationTargetException e){if(e.getCause() instanceof Stop)out.println("result error");else throw e;}
+            out.printf("final %s %016x%n",vector(d.velocity),Double.doubleToLongBits(entity.fallDistance));out.println("queries "+d.calls);
+        }}
+    }
+}
@@ -0,0 +1,97 @@
+#!/usr/bin/env python3
+"""Compare LivingEntity air travel, climbing and input movement with vanilla."""
+import argparse
+import json
+import os
+from pathlib import Path
+import platform
+import subprocess
+import random
+import struct
+import math
+try:
+    from . import lab, test_rust_parity as base
+except ImportError:
+    import lab
+    import test_rust_parity as base
+
+
+def corpus():
+    def bits(v):return struct.pack('>d',float(v)).hex()
+    def single(v):return struct.pack('>f',float(v)).hex()
+    def row(**kw):
+        f=dict(mode='air',input=[.4,0,.8],velocity=[.1,-.08,-.2],after_velocity=[.3,-.6,.9],fall=6,friction=.6,friction_modifier=1,drag_modifier=1,speed=.1,flying_speed=.02,yaw=37,ground=[True,True],climb=[False,False],scaffolding=False,suppress=False,player=False,horizontal=False,jumping=False,snow=False,after_horizontal=False,after_jumping=False,after_snow=False,powder_tag=False,boots=False,levitation=None,client=False,chunk=True,gravity=.08,y=64,min_y=-64,discard=False,omni=False,yaw_mutate=False,move_mutate=False,fail=-1)
+        f.update(kw)
+        for k in ['input','velocity','after_velocity']:f[k]=[bits(v) for v in f[k]]
+        for k in ['fall','friction_modifier','drag_modifier','gravity','y']:f[k]=bits(f[k])
+        for k in ['friction','speed','flying_speed','yaw']:f[k]=single(f[k])
+        return f
+    vals=[-float('inf'),-1e30,-1,-.15,-1e-40,-0.0,0,1e-40,.02,.1,.15,.6,.91,.98,1,2,1e30,float('inf'),float('nan')]
+    for friction in vals:
+        for modifier in vals:yield row(mode='friction',friction=friction,friction_modifier=modifier)
+    for friction in vals+[.59999996,.60000002]:
+        for speed in vals:
+            for ground in [False,True]:yield row(mode='speed',friction=friction,speed=speed,flying_speed=speed,ground=[ground])
+    vectors=[[0,0,0],[-0.0,-0.0,-0.0],[.0001,0,0],[math.sqrt(1e-7),0,0],[1,0,0],[0,0,1],[1,1,1],[float('inf'),0,0],[float('nan'),.1,0],[0,-.15000000596046448,0],[0,-float('inf'),0]]
+    for i in range(4096):yield row(mode='input',yaw=i*360/4096,input=[.7,.3,-.8])
+    for v in vectors:
+        for yaw in vals+[90,180,270,360,-360]:
+            for speed in [.1,-0.0,float('inf'),float('nan')]:yield row(mode='input',input=v,yaw=yaw,speed=speed)
+    for v in vectors+[[.5,-.7,-.5],[0,-0.0,0]]:
+        for climb in [False,True]:
+            for player in [False,True]:
+                for scaffolding in [False,True]:
+                    for suppress in [False,True]:
+                        for fail in range(-1,5):yield row(mode='climb',input=v,climb=[climb],player=player,scaffolding=scaffolding,suppress=suppress,fail=fail)
+    for ground in [[False],[True],[True,False],[False,True]]:
+        for climb in [[False],[True],[False,True],[True,False]]:
+            for bits_mask in range(256):
+                flags={k:bool(bits_mask&(1<<i)) for i,k in enumerate(['player','scaffolding','suppress','after_horizontal','after_jumping','after_snow','powder_tag','boots'])}
+                yield row(mode='relative',ground=ground,climb=climb,**flags)
+    for levitation in [None,0,1,255,2147483647]:
+        for client in [False,True]:
+            for chunk in [False,True]:
+                for y in [-float('inf'),-64,-63,0,float('inf'),float('nan')]:
+                    for discard in [False,True]:
+                        for omni in [False,True]:
+                            for fail in range(-1,24):yield row(levitation=levitation,client=client,chunk=chunk,y=y,discard=discard,omni=omni,fail=fail,move_mutate=True,yaw_mutate=True,climb=[True],after_horizontal=True,player=True,suppress=True)
+    rng=random.Random(0x414952)
+    flags=['player','scaffolding','suppress','horizontal','jumping','snow','after_horizontal','after_jumping','after_snow','powder_tag','boots','client','chunk','discard','omni','yaw_mutate','move_mutate']
+    for _ in range(12000):
+        f={k:bool(rng.randrange(2)) for k in flags}
+        for k in ['friction','speed','flying_speed','friction_modifier','drag_modifier','gravity','yaw']:f[k]=rng.choice(vals) if rng.randrange(3)==0 else rng.uniform(-2,2)
+        yield row(**f,input=rng.choice(vectors),velocity=rng.choice(vectors),after_velocity=rng.choice(vectors),ground=[bool(rng.randrange(2)),bool(rng.randrange(2))],climb=[bool(rng.randrange(2)),bool(rng.randrange(2))],levitation=rng.choice([None,None,0,1,255,2147483647]),fail=rng.choice([-1,-1,*range(24)]))
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-living-air-parity';build.mkdir(parents=True,exist_ok=True)
+    report_path=build/'report.json';report_path.unlink(missing_ok=True)
+    if args.prepare:lab.prepare()
+    lock,jars,libraries=base.verify_artifacts()
+    oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaLivingAirOracle.java'
+    sources=[oracle,Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/lab.py',lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-core/Cargo.toml',lab.ROOT/'crates/horizon-world/Cargo.toml',*sorted((lab.ROOT/'crates/horizon-core/src').rglob('*.rs')),*sorted((lab.ROOT/'crates/horizon-world/src').rglob('*.rs')),lab.ROOT/'crates/horizon-world/examples/living_air_fixture.rs']
+    tested_sources=base.source_hashes(sources)
+    classes=build/'classes';classes.mkdir(exist_ok=True)
+    def run(command,name):
+        with (build/(name+'.log')).open('w',encoding='utf-8') as log:base.run(list(map(str,command)),stdout=log,stderr=subprocess.STDOUT)
+    dependency_path=os.pathsep.join(map(str,libraries))
+    run(['javac','--release',lock['minecraft']['java_major'],'-proc:none','-cp',str(jars['server'])+os.pathsep+dependency_path,'-d',classes,oracle],'compile-java')
+    def java(side,mode,path):
+        run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jars[side]),dependency_path]),'dev.horizonlab.parity.VanillaLivingAirOracle',mode,path],side+'-'+mode)
+    fixtures=list(corpus());inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
+    fixture_paths=[inputs];tested_fixtures=base.source_hashes(fixture_paths)
+    run(['cargo','build','--release','-p','horizon-world','--example','living_air_fixture'],'compile-rust')
+    metadata=json.loads(subprocess.check_output(['cargo','metadata','--no-deps','--format-version','1'],cwd=lab.ROOT,text=True))
+    binary=Path(metadata['target_directory'])/'release/examples'/('living_air_fixture.exe' if os.name=='nt' else 'living_air_fixture')
+    run([binary,build],'rust');references=[]
+    for side,jar in jars.items():
+        java(side,side,build);reference=build/f'{side}.txt';matched=base.compare(reference,build/'rust.txt')
+        references.append({'side':side,'jar_sha256':lab.digest(jar,'sha256'),'output_sha256':lab.digest(reference,'sha256'),'matched_output_lines':matched})
+        print(f'{side}: {matched:,} living-air output lines match Rust',flush=True)
+    base.ensure_sources_unchanged(sources,tested_sources);base.ensure_sources_unchanged(fixture_paths,tested_fixtures)
+    report={'schema':1,'minecraft':lock['minecraft']['version'],'manifest_sha1':lock['minecraft']['manifest_sha1'],'platform':platform.platform(),'java':subprocess.check_output(['java','--version'],text=True).splitlines()[0],'rustc':subprocess.check_output(['rustc','--version'],text=True).strip(),'fixtures':len(fixtures),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'references':references,'scope':'Actual LivingEntity.travelInAir, handleRelativeFrictionAndCalculateMovement, handleOnClimbable, getFrictionInfluencedSpeed, computeModifiedFriction and Entity.getInputVector. Traces native moveRelative and state writes, both Player/nonplayer ladder guards, registered scaffolding/boots checks, levitation, missing client chunks, float friction/drag, callback mutations and failures. Entity.move, effective gravity, ground/climb predicates and attributes use controlled providers; live world integration and complete player travel remain pending.'}
+    lab.write_json(report_path,report);print(f'Scoped living air parity passed: {report_path}')
+
+
+if __name__=='__main__':main()