Match player swimming and ability-flight travel wrapper

2026-10-07 02:39:16 +02:00
parent 88c1f842ae
commit 8df023babf
7 changed files with 597 additions and 0 deletions
@@ -0,0 +1,229 @@
+{
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+    "crates/horizon-world/src/worldgen/biome_predicate.rs": "bfc581bc40077cc74ffda43e990a55fe997adc04c7130f98e039c3305ca79aac",
+    "crates/horizon-world/src/worldgen/biome_source/codec.rs": "2b9e4f5d679eb444cb73174f511e3b9f32e9eb138248ab12cffc6cfd76adf3a8",
+    "crates/horizon-world/src/worldgen/biome_source/runtime.rs": "f0b02c1521178e4d0377c6ca62694604b6a773f1f234f070ff0cde4685911d45",
+    "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",
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+    "crates/horizon-world/src/worldgen/carver/generation.rs": "a4498d0d1457536de3922a08e9c40ccce8d2ef9cc263801c15a412327513c098",
+    "crates/horizon-world/src/worldgen/carver.rs": "46b251e28225fe1250de38f49dec5dacda4e2c4ba1e556e21e6d1e14e2651fc3",
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+    "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/player_travel_fixture.rs": "c52773da7223773565fe5685653caffec97d0ab83713ab91fcdbb1683b440f94"
+  },
+  "fixtures_sha256": {
+    ".local/rust-player-travel-parity/inputs.txt": "8ab97e056004d2291ac9b66d1e89aed823c1236b2fbcc46b100e9b0d581cbd30"
+  },
+  "rust_output_sha256": "e00866cdc3ebc3d82e51b1b6ecf9d57ea6b4ff526a5e92698152bd3fef490d5a",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "e00866cdc3ebc3d82e51b1b6ecf9d57ea6b4ff526a5e92698152bd3fef490d5a",
+      "matched_output_lines": 120933
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "e00866cdc3ebc3d82e51b1b6ecf9d57ea6b4ff526a5e92698152bd3fef490d5a",
+      "matched_output_lines": 120933
+    }
+  ],
+  "scope": "Actual Player.travel, getFlyingSpeed and isAffectedByFluids. Covers passenger bypass, swim look pitch and head-fluid queries, flying vertical preservation, sprint speed, lazy ability access, provider mutations/failures, signed zero and nonfinite coordinates/velocity. Parent LivingEntity.travel selects an instrumented fluid branch; actual air/fluid collision simulation and full player/world gameplay remain separately pending integration."
+}
@@ -0,0 +1,156 @@
+use horizon_core::{geometry::Vec3, position::BlockPos};
+use horizon_world::player_travel::*;
+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,
+    velocity: Vec3,
+    position: Vec3,
+    flying: 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() {
+            return Err(io::Error::other("injected player travel failure"));
+        }
+        if n == self.f["mutate_at"].as_i64().unwrap() {
+            self.velocity = vec(&self.f["after_velocity"]);
+            self.position = vec(&self.f["after_position"]);
+            self.flying = self.flag("after_flying");
+        }
+        Ok(())
+    }
+}
+impl PlayerTravelWorld for World<'_> {
+    type Error = io::Error;
+    fn is_passenger(&mut self) -> io::Result<bool> {
+        self.query("passenger")?;
+        Ok(self.flag("passenger"))
+    }
+    fn is_swimming(&mut self) -> io::Result<bool> {
+        self.query("swimming")?;
+        Ok(self.flag("swimming"))
+    }
+    fn look_angle(&mut self) -> io::Result<Vec3> {
+        self.query("look")?;
+        Ok(vec(&self.f["look"]))
+    }
+    fn jumping(&self) -> bool {
+        self.flag("jumping")
+    }
+    fn position(&self) -> Vec3 {
+        self.position
+    }
+    fn fluid_is_empty(&mut self, p: BlockPos) -> io::Result<bool> {
+        self.query(format!("fluid {} {} {}", p.x, p.y, p.z))?;
+        Ok(self.flag("empty"))
+    }
+    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 query_flying_ability(&mut self) -> io::Result<bool> {
+        self.query("abilities")?;
+        Ok(self.flying)
+    }
+    fn flying_ability(&self) -> bool {
+        self.flying
+    }
+    fn ability_flying_speed(&mut self) -> io::Result<f32> {
+        self.query("ability-speed")?;
+        Ok(single(&self.f["speed"]))
+    }
+    fn sprinting(&mut self) -> io::Result<bool> {
+        self.query("sprint")?;
+        Ok(self.flag("sprint"))
+    }
+    fn living_travel(&mut self, input: Vec3) -> io::Result<()> {
+        // Native parent dispatch is exercised through a controlled fluid branch.
+        self.query("block-position")?;
+        self.query("fluid 17 -64 -33")?;
+        self.query("should-fluid")?;
+        self.query(format!("base {}", vector(input)))?;
+        if self.flag("base_mutate") {
+            self.velocity = vec(&self.f["base_velocity"]);
+            self.flying = self.flag("base_flying");
+        }
+        Ok(())
+    }
+}
+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,
+            velocity: vec(&f["velocity"]),
+            position: vec(&f["position"]),
+            flying: f["flying"].as_bool().unwrap(),
+        };
+        let result: io::Result<()> = match f["mode"].as_str().unwrap() {
+            "travel" => travel(&mut w, vec(&f["input"])),
+            "speed" => flying_speed(&mut w).and_then(|v| writeln!(w.out, "float {:08x}", fbits(v))),
+            "affected" => {
+                let b = affected_by_fluids(&w);
+                writeln!(w.out, "bool {b}")
+            }
+            _ => panic!("mode"),
+        };
+        writeln!(
+            w.out,
+            "result {}",
+            if result.is_ok() { "ok" } else { "error" }
+        )?;
+        writeln!(
+            w.out,
+            "final {} {} {}",
+            vector(w.velocity),
+            vector(w.position),
+            w.flying
+        )?;
+        writeln!(w.out, "queries {}", w.calls)?;
+    }
+    Ok(())
+}
@@ -40,6 +40,7 @@ pub mod movement_support;
 pub mod nbt;
 pub mod piston_movement;
 pub mod piston_shape;
+pub mod player_travel;
 pub mod powder_snow_collision;
 pub mod region;
 pub mod registry;
@@ -0,0 +1,71 @@
+//! Player-specific swimming and ability-flight behavior around living travel.
+use horizon_core::{geometry::Vec3, position::BlockPos};
+pub trait PlayerTravelWorld {
+    type Error;
+    fn is_passenger(&mut self) -> Result<bool, Self::Error>;
+    fn is_swimming(&mut self) -> Result<bool, Self::Error>;
+    fn look_angle(&mut self) -> Result<Vec3, Self::Error>;
+    fn jumping(&self) -> bool;
+    fn position(&self) -> Vec3;
+    fn fluid_is_empty(&mut self, position: BlockPos) -> Result<bool, Self::Error>;
+    fn velocity(&self) -> Vec3;
+    fn set_velocity(&mut self, velocity: Vec3) -> Result<(), Self::Error>;
+    /// Virtual getAbilities(), as distinct from direct abilities-field reads.
+    fn query_flying_ability(&mut self) -> Result<bool, Self::Error>;
+    fn flying_ability(&self) -> bool;
+    fn ability_flying_speed(&mut self) -> Result<f32, Self::Error>;
+    fn sprinting(&mut self) -> Result<bool, Self::Error>;
+    fn living_travel(&mut self, input: Vec3) -> Result<(), Self::Error>;
+}
+pub fn travel<W: PlayerTravelWorld>(world: &mut W, input: Vec3) -> Result<(), W::Error> {
+    if world.is_passenger()? {
+        return world.living_travel(input);
+    }
+    if world.is_swimming()? {
+        let look_y = world.look_angle()?.y;
+        let scale = if look_y < -0.2 { 0.085 } else { 0.06 };
+        let apply = if look_y <= 0.0 || world.jumping() {
+            true
+        } else {
+            let p = world.position();
+            !world.fluid_is_empty(BlockPos::new(
+                p.x.floor() as i32,
+                (p.y + 1.0 - 0.1).floor() as i32,
+                p.z.floor() as i32,
+            ))?
+        };
+        if apply {
+            let v = world.velocity();
+            world.set_velocity(Vec3::new(
+                v.x + 0.0,
+                v.y + (look_y - v.y) * scale,
+                v.z + 0.0,
+            ))?;
+        }
+    }
+    if world.query_flying_ability()? {
+        let y = world.velocity().y;
+        world.living_travel(input)?;
+        let v = world.velocity();
+        world.set_velocity(Vec3::new(v.x, y * 0.6, v.z))?;
+    } else {
+        world.living_travel(input)?;
+    }
+    Ok(())
+}
+pub fn flying_speed<W: PlayerTravelWorld>(world: &mut W) -> Result<f32, W::Error> {
+    if world.flying_ability() && !world.is_passenger()? {
+        let sprinting = world.sprinting()?;
+        let speed = world.ability_flying_speed()?;
+        Ok(if sprinting { speed * 2.0 } else { speed })
+    } else {
+        Ok(if world.sprinting()? {
+            0.025999999f32
+        } else {
+            0.02
+        })
+    }
+}
+pub fn affected_by_fluids<W: PlayerTravelWorld>(world: &W) -> bool {
+    !world.flying_ability()
+}
@@ -885,3 +885,19 @@ raw effect amplifiers, signed zero/nonfinite values, rider classes, callback
 mutations and failures. Targeted Clippy passes. Entity-type jump/flight overrides,
 effect and attribute storage, registered jump-factor binding and live gameplay
 integration remain pending.
+
+
+`player_travel` wraps living travel with passenger bypass, swimming pitch
+adjustment, head-fluid checks and preservation of creative-flight vertical
+velocity. It also binds player flight speed to sprint/passenger/ability rules
+and implements the flying ability's fluid-affection predicate.
+
+`python3 tools/test_player_travel_parity.py` invokes actual `Player.travel`,
+`getFlyingSpeed` and `isAffectedByFluids`. The
+[player travel report](../benchmarks/rust-player-travel-2026-10-07/scoped-parity.json)
+records **120,933 matching lines per JAR**, including ability and velocity
+mutations, callback failures, signed zero/nonfinite positions and the distinction
+between direct ability fields and virtual ability access. Targeted Clippy passes.
+Parent travel is selected through a controlled fluid callback; connecting the
+verified living phases and collision movement to the live player/world remains
+pending.
@@ -0,0 +1,42 @@
+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.world.entity.*;import net.minecraft.world.entity.player.*;import net.minecraft.world.level.material.*;import net.minecraft.world.phys.Vec3;
+/** Actual Player travel wrapper and flight speed, with controlled parent fluid travel. */
+public final class VanillaPlayerTravelOracle {
+    static final class Stop extends RuntimeException {}
+    static Field position;
+    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;Vec3 velocity;Actor actor;Ability ability;
+        void query(String s){out.println(s);int n=calls++;if(n==f.get("fail").getAsInt())throw new Stop();if(n==f.get("mutate_at").getAsInt()){velocity=vec(f.get("after_velocity"));try{position.set(actor,vec(f.get("after_position")));}catch(ReflectiveOperationException e){throw new AssertionError(e);}ability.flying=flag("after_flying");}}
+        boolean flag(String k){return f.get(k).getAsBoolean();}}
+    static final class Ability extends Abilities {Data d;@Override public float getFlyingSpeed(){d.query("ability-speed");return single(d.f.get("speed"));}}
+    static final class Level extends net.minecraft.server.level.ServerLevel {Data d;Level(){super(null,null,null,null,null,null,false,0L,List.of(),false);}
+        @Override public FluidState getFluidState(BlockPos p){d.query("fluid "+p.getX()+" "+p.getY()+" "+p.getZ());return (d.flag("empty")?Fluids.EMPTY:Fluids.WATER).defaultFluidState();}}
+    static final class Actor extends Player {
+        Data d;Actor(){super(null,null);}void configure(Level l){setLevel(l);}
+        @Override public net.minecraft.world.level.GameType gameMode(){return net.minecraft.world.level.GameType.SURVIVAL;}
+        @Override public boolean isPassenger(){d.query("passenger");return d.flag("passenger");}
+        @Override public boolean isSwimming(){d.query("swimming");return d.flag("swimming");}
+        @Override public Vec3 getLookAngle(){d.query("look");return vec(d.f.get("look"));}
+        @Override public Vec3 getDeltaMovement(){return d.velocity;}
+        @Override public void setDeltaMovement(Vec3 v){d.query("set "+vector(v));d.velocity=v;}
+        @Override public Abilities getAbilities(){d.query("abilities");return d.ability;}
+        @Override public boolean isSprinting(){d.query("sprint");return d.flag("sprint");}
+        @Override public BlockPos blockPosition(){d.query("block-position");return new BlockPos(17,-64,-33);}
+        @Override protected boolean shouldTravelInFluid(FluidState fluid){d.query("should-fluid");return true;}
+        @Override protected void travelInFluid(Vec3 input){d.query("base "+vector(input));if(d.flag("base_mutate")){d.velocity=vec(d.f.get("base_velocity"));d.ability.flying=d.flag("base_flying");}}
+        float flightSpeed(){return getFlyingSpeed();}
+    }
+    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);position=Entity.class.getDeclaredField("position");position.setAccessible(true);var abilities=Player.class.getDeclaredField("abilities");abilities.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 entity=(Actor)allocate.invoke(unsafe,Actor.class);d.actor=entity;entity.d=d;var level=(Level)allocate.invoke(unsafe,Level.class);level.d=d;entity.configure(level);var ability=new Ability();ability.d=d;ability.flying=d.flag("flying");d.ability=ability;abilities.set(entity,ability);position.set(entity,vec(f.get("position")));jumping.setBoolean(entity,d.flag("jumping"));
+            try{switch(f.get("mode").getAsString()){case "travel"->entity.travel(vec(f.get("input")));case "speed"->out.printf("float %08x%n",Float.floatToIntBits(entity.flightSpeed()));case "affected"->out.println("bool "+entity.isAffectedByFluids());default->throw new AssertionError();}out.println("result ok");}catch(Stop e){out.println("result error");}
+            out.println("final "+vector(d.velocity)+" "+vector((Vec3)position.get(entity))+" "+ability.flying);out.println("queries "+d.calls);
+        }}
+    }
+}
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+"""Compare Player travel wrapper and flying speed 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='travel',input=[.2,0,.8],velocity=[.1,-.08,.2],position=[.3,64,-.3],look=[0,.5,1],after_velocity=[17,18,19],after_position=[17,-64,-33],after_flying=False,base_velocity=[31,32,33],base_flying=False,base_mutate=True,passenger=False,swimming=True,jumping=False,empty=False,flying=True,sprint=False,speed=.05,fail=-1,mutate_at=-1)
+        f.update(kw)
+        for k in ['input','velocity','position','look','after_velocity','after_position','base_velocity']:f[k]=[bits(v) for v in f[k]]
+        f['speed']=single(f['speed']);return f
+    vals=[-float('inf'),-1e30,-1,-.20000000001,-.2,-.19999999999,-1e-40,-0.0,0,1e-40,.1,.5,1,1e30,float('inf'),float('nan')]
+    for y in vals:
+        for mask in range(128):
+            flags={k:bool(mask&(1<<i)) for i,k in enumerate(['passenger','swimming','jumping','empty','flying','base_mutate','base_flying'])}
+            yield row(look=[0,y,1],**flags)
+    positions=[[.3,64,-.3],[-0.0,-0.0,-0.0],[17,-64,-33],[30000000,319,-30000000],[1,float('nan'),2],[float('inf'),1,-float('inf')],[2147483648,-2147483649,0]]
+    for p in positions:
+        for y in vals:
+            for vy in vals:yield row(position=p,look=[0,y,0],velocity=[-0.0,vy,-0.0])
+    for mode in ['speed','affected']:
+        for speed in vals:
+            for passenger in [False,True]:
+                for flying in [False,True]:
+                    for sprint in [False,True]:yield row(mode=mode,speed=speed,passenger=passenger,flying=flying,sprint=sprint)
+    for mode in ['travel','speed','affected']:
+        for fail in range(-1,14):
+            for mutate_at in range(-1,14):
+                for after_flying in [False,True]:yield row(mode=mode,fail=fail,mutate_at=mutate_at,after_flying=after_flying)
+    rng=random.Random(0x504c41594552)
+    for _ in range(10000):
+        flags={k:bool(rng.randrange(2)) for k in ['passenger','swimming','jumping','empty','flying','base_mutate','base_flying','after_flying','sprint']}
+        yield row(**flags,mode=rng.choice(['travel','travel','speed','affected']),position=rng.choice(positions),look=[0,rng.choice(vals),0],velocity=[rng.choice(vals),rng.choice(vals),rng.choice(vals)],after_velocity=[rng.choice(vals),rng.choice(vals),rng.choice(vals)],base_velocity=[rng.choice(vals),rng.choice(vals),rng.choice(vals)],speed=rng.choice(vals),fail=rng.choice([-1,-1,*range(14)]),mutate_at=rng.randrange(-1,14))
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-player-travel-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/VanillaPlayerTravelOracle.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/player_travel_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.VanillaPlayerTravelOracle',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','player_travel_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'/('player_travel_fixture.exe' if os.name=='nt' else 'player_travel_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:,} player-travel 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 Player.travel, getFlyingSpeed and isAffectedByFluids. Covers passenger bypass, swim look pitch and head-fluid queries, flying vertical preservation, sprint speed, lazy ability access, provider mutations/failures, signed zero and nonfinite coordinates/velocity. Parent LivingEntity.travel selects an instrumented fluid branch; actual air/fluid collision simulation and full player/world gameplay remain separately pending integration.'}
+    lab.write_json(report_path,report);print(f'Scoped player travel parity passed: {report_path}')
+
+
+if __name__=='__main__':main()