Match post-collision restitution and bounce side-effect ordering

2026-11-07 02:56:17 -10:00 · 2026-10-07 00:23:13 +02:00
1 parent 7ac3d31313
commit cebf0c0e06
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+    "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/restitution_fixture.rs": "1c970701dc434155f8c830626ef5ad4cc9ac20330ceb2c91c3e351215b8dedf3"
+  },
+  "fixtures_sha256": {
+    ".local/rust-restitution-parity/inputs.txt": "c123b46f42604e661c867d1ecf22f3ce1d84b19cb79dd11869aa7d92e6bba9a7"
+  },
+  "rust_output_sha256": "94ab544d2c4c0a2644907521b96b913eeed376863b26912dda56755b48255cb5",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "94ab544d2c4c0a2644907521b96b913eeed376863b26912dda56755b48255cb5",
+      "matched_output_lines": 177090
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "94ab544d2c4c0a2644907521b96b913eeed376863b26912dda56755b48255cb5",
+      "matched_output_lines": 177090
+    }
+  ],
+  "scope": "Actual Entity.restituteMovementAfterCollisions over living/nonliving snapshots and controlled block restitution/tag behavior. Compares horizontal/vertical bounce, effective-gravity threshold, nonliving float scaling, air-drag interpolation, signed zero/nonfinite values and ordered lazy queries. Bounce callbacks can change velocity and fail; final velocity and syncPosition are checked after every injected failure boundary. This does not establish registered block restitution/tag provisioning, actual bounce sound/game-event effects, Entity.move guard conditions, fall damage, grounding or full gameplay."
+}
@@ -0,0 +1,162 @@
+use horizon_core::{geometry::Vec3, position::BlockPos};
+use horizon_world::{
+    movement_restitution::{RestitutionInput, RestitutionWorld, restitute_movement},
+    registry::BlockStateId,
+};
+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 vector(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 vector_text(prefix: &str, v: Vec3) -> String {
+    format!(
+        "{prefix} {:016x} {:016x} {:016x}",
+        bits(v.x),
+        bits(v.y),
+        bits(v.z)
+    )
+}
+struct World<'a, W> {
+    f: &'a Value,
+    out: &'a mut W,
+    calls: i32,
+    suppress_calls: usize,
+    gravity_calls: usize,
+    velocity: Vec3,
+    sync: bool,
+}
+impl<W: Write> World<'_, W> {
+    fn query(&mut self, text: &str) -> io::Result<()> {
+        writeln!(self.out, "{text}")?;
+        let call = self.calls;
+        self.calls += 1;
+        if call == self.f["fail"].as_i64().unwrap() as i32 {
+            Err(io::Error::other("injected restitution failure"))
+        } else {
+            Ok(())
+        }
+    }
+}
+impl<W: Write> RestitutionWorld for World<'_, W> {
+    type Error = io::Error;
+    fn suppressing_bounce(&mut self) -> io::Result<bool> {
+        self.query("suppress")?;
+        let values = self.f["suppress"].as_array().unwrap();
+        let result = values[self.suppress_calls.min(values.len() - 1)]
+            .as_bool()
+            .unwrap();
+        self.suppress_calls += 1;
+        Ok(result)
+    }
+    fn entity_bounciness(&mut self) -> io::Result<f64> {
+        self.query("entity-bounce")?;
+        Ok(number(&self.f["entity"]))
+    }
+    fn velocity(&mut self) -> io::Result<Vec3> {
+        self.query("velocity")?;
+        Ok(self.velocity)
+    }
+    fn effective_gravity(&mut self) -> io::Result<f64> {
+        self.query("gravity")?;
+        let values = self.f["gravity"].as_array().unwrap();
+        let result = number(&values[self.gravity_calls.min(values.len() - 1)]);
+        self.gravity_calls += 1;
+        Ok(result)
+    }
+    fn block_suppresses_bounce(&mut self, _: BlockStateId) -> io::Result<bool> {
+        self.query("block-suppresses")?;
+        Ok(self.f["tag"].as_bool().unwrap())
+    }
+    fn block_bounce_restitution(&mut self, _: BlockStateId) -> io::Result<f32> {
+        self.query("block-bounce")?;
+        Ok(single(&self.f["block"]))
+    }
+    fn air_drag(&mut self) -> io::Result<f32> {
+        self.query("drag")?;
+        Ok(single(&self.f["drag"]))
+    }
+    fn movement_support_position(&mut self) -> io::Result<BlockPos> {
+        self.query("support-position")?;
+        Ok(BlockPos::new(17, -64, -33))
+    }
+    fn bounce_on(&mut self, _: BlockStateId, p: BlockPos, fall: f64) -> io::Result<()> {
+        self.query(&format!(
+            "bounce-on {} {} {} {:016x}",
+            p.x,
+            p.y,
+            p.z,
+            bits(fall)
+        ))?;
+        if self.f["mutate"].as_bool().unwrap() {
+            self.velocity = Vec3::new(17.0, 18.0, 19.0);
+        }
+        Ok(())
+    }
+    fn bounce_event(&mut self) -> io::Result<()> {
+        self.query("bounce-event")
+    }
+    fn mark_position_for_sync(&mut self) {
+        self.sync = true;
+    }
+    fn set_velocity(&mut self, v: Vec3) -> io::Result<()> {
+        self.query(&vector_text("set-velocity", v))?;
+        self.velocity = v;
+        Ok(())
+    }
+}
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let arg = std::env::args().nth(1).expect("private fixture directory");
+    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 world = World {
+            f: &f,
+            out: &mut out,
+            calls: 0,
+            suppress_calls: 0,
+            gravity_calls: 0,
+            velocity: vector(&f["velocity"]),
+            sync: f["sync"].as_bool().unwrap(),
+        };
+        let result = restitute_movement(
+            &mut world,
+            RestitutionInput {
+                block: BlockStateId(1),
+                collided_x: f["x"].as_bool().unwrap(),
+                collided_z: f["z"].as_bool().unwrap(),
+                vertical_collision: f["vertical"].as_bool().unwrap(),
+                collision_below: f["below"].as_bool().unwrap(),
+                living: f["living"].as_bool().unwrap(),
+                resolved_movement: vector(&f["resolved"]),
+                fall_distance: number(&f["fall"]),
+            },
+        );
+        writeln!(
+            world.out,
+            "result {}",
+            if result.is_ok() { "ok" } else { "error" }
+        )?;
+        writeln!(world.out, "{}", vector_text("final", world.velocity))?;
+        writeln!(world.out, "sync {}", world.sync)?;
+        writeln!(world.out, "queries {}", world.calls)?;
+    }
+    Ok(())
+}
@@ -20,6 +20,7 @@ pub mod entity_obstruction;
 pub mod fluid;
 pub mod heightmap;
 pub mod liquid_collision;
+pub mod movement_restitution;
 pub mod nbt;
 pub mod piston_shape;
 pub mod powder_snow_collision;
@@ -0,0 +1,100 @@
+//! Native post-collision restitution, including lazy bounce queries and effects.
+use crate::registry::BlockStateId;
+use horizon_core::{geometry::Vec3, position::BlockPos};
+
+pub struct RestitutionInput {
+    pub block: BlockStateId,
+    pub collided_x: bool,
+    pub collided_z: bool,
+    pub vertical_collision: bool,
+    pub collision_below: bool,
+    pub living: bool,
+    pub resolved_movement: Vec3,
+    pub fall_distance: f64,
+}
+pub trait RestitutionWorld {
+    type Error;
+    fn suppressing_bounce(&mut self) -> Result<bool, Self::Error>;
+    fn entity_bounciness(&mut self) -> Result<f64, Self::Error>;
+    fn velocity(&mut self) -> Result<Vec3, Self::Error>;
+    fn effective_gravity(&mut self) -> Result<f64, Self::Error>;
+    fn block_suppresses_bounce(&mut self, block: BlockStateId) -> Result<bool, Self::Error>;
+    fn block_bounce_restitution(&mut self, block: BlockStateId) -> Result<f32, Self::Error>;
+    fn air_drag(&mut self) -> Result<f32, Self::Error>;
+    fn movement_support_position(&mut self) -> Result<BlockPos, Self::Error>;
+    fn bounce_on(
+        &mut self,
+        block: BlockStateId,
+        position: BlockPos,
+        fall_distance: f64,
+    ) -> Result<(), Self::Error>;
+    fn bounce_event(&mut self) -> Result<(), Self::Error>;
+    /// Native field write after bounce callbacks and before setting velocity.
+    fn mark_position_for_sync(&mut self);
+    fn set_velocity(&mut self, velocity: Vec3) -> Result<(), Self::Error>;
+}
+fn java_max(a: f64, b: f64) -> f64 {
+    if a.is_nan() {
+        a
+    } else if b.is_nan() {
+        b
+    } else if a == 0.0 && b == 0.0 {
+        f64::from_bits(a.to_bits() & b.to_bits())
+    } else {
+        a.max(b)
+    }
+}
+/// Provider errors preserve already performed effects; no rollback is attempted.
+/// Call only when Entity.move's simulation/collision guards request restitution.
+pub fn restitute_movement<W: RestitutionWorld>(
+    world: &mut W,
+    input: RestitutionInput,
+) -> Result<(), W::Error> {
+    let mut bounce = if world.suppressing_bounce()? {
+        0.0
+    } else {
+        world.entity_bounciness()?
+    };
+    let old = world.velocity()?;
+    let mut velocity = old;
+    if input.collided_x {
+        velocity.x = -old.x * bounce;
+    }
+    if input.collided_z {
+        velocity.z = -old.z * bounce;
+    }
+    let mut emit = bounce > 0.0 && (input.collided_x || input.collided_z);
+    if input.vertical_collision {
+        if input.collision_below {
+            if -old.y <= world.effective_gravity()?
+                || world.suppressing_bounce()?
+                || world.block_suppresses_bounce(input.block)?
+            {
+                bounce = 0.0;
+            } else {
+                let mut block = world.block_bounce_restitution(input.block)?;
+                if !input.living {
+                    block *= 0.8f32;
+                }
+                bounce = java_max(bounce, f64::from(block));
+            }
+        }
+        let (gravity, drag) = if bounce > 0.0 {
+            let fraction = input.resolved_movement.y / old.y;
+            let gravity = fraction * world.effective_gravity()?;
+            let drag = 1.0 + fraction * (f64::from(world.air_drag()?) - 1.0);
+            emit = true;
+            (gravity, drag)
+        } else {
+            (0.0, 1.0)
+        };
+        velocity.y = (gravity - old.y) * drag * bounce;
+    }
+    if emit {
+        let position = world.movement_support_position()?;
+        world.bounce_on(input.block, position, input.fall_distance)?;
+        world.bounce_event()?;
+        world.mark_position_for_sync();
+    }
+    world.set_velocity(velocity)
+}
@@ -519,3 +519,21 @@ nonnegative absolute limits/durations. A unit test verifies invalid parameters
 leave the existing extent unchanged; workspace Clippy passes. Saved-data codecs,
 listeners, dirty-state events, damage, synchronization and live movement binding
 remain separate work.
+
+
+`restitute_movement` now implements the pinned post-collision velocity calculation
+with lazy entity/block bounce queries, gravity thresholds, nonliving float
+scaling and air-drag interpolation. It preserves horizontal/vertical collision
+branches, callback ordering, the position-sync field write and final velocity
+assignment. Errors retain already performed effects instead of rolling back the
+world or returning a fabricated successful velocity.
+
+`python3 tools/test_restitution_parity.py` executes actual
+`Entity.restituteMovementAfterCollisions` on living and nonliving snapshots with
+controlled block restitution and suppression tags. The
+[restitution report](../benchmarks/rust-restitution-2026-10-07/scoped-parity.json)
+records **177,090 matching lines per JAR**. Fixtures cover changing lazy getter
+values, signed zero/nonfinite arithmetic, bounce callbacks that alter velocity,
+and failures before/after each side effect. Workspace Clippy passes. Registered
+block property/tag provisioning, actual bounce sounds/events, `Entity.move`
+guards, fall damage, grounding and full player simulation remain pending.
@@ -0,0 +1,78 @@
+package dev.horizonlab.parity;
+import com.google.gson.*;
+import java.io.*;
+import java.lang.reflect.*;
+import java.nio.file.*;
+import net.minecraft.core.*;
+import net.minecraft.tags.*;
+import net.minecraft.world.entity.*;
+import net.minecraft.world.entity.decoration.ArmorStand;
+import net.minecraft.world.level.*;
+import net.minecraft.world.level.block.*;
+import net.minecraft.world.level.block.state.*;
+import net.minecraft.world.level.gameevent.GameEvent;
+import net.minecraft.world.phys.Vec3;
+/** Actual Entity restitution with traced provider methods and bounce effects. */
+public final class VanillaRestitutionOracle {
+    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 vector(JsonElement v){var a=v.getAsJsonArray();return new Vec3(number(a.get(0)),number(a.get(1)),number(a.get(2)));}
+    static String vectorText(String prefix,Vec3 v){return String.format("%s %016x %016x %016x",prefix,Double.doubleToLongBits(v.x),Double.doubleToLongBits(v.y),Double.doubleToLongBits(v.z));}
+    static final class Data {
+        JsonObject input;PrintWriter out;int calls,suppressCalls,gravityCalls;Vec3 velocity;
+        void query(String text){out.println(text);if(calls++==input.get("fail").getAsInt())throw new Stop();}
+        boolean suppress(){query("suppress");var values=input.getAsJsonArray("suppress");return values.get(Math.min(suppressCalls++,values.size()-1)).getAsBoolean();}
+        double gravity(){query("gravity");var values=input.getAsJsonArray("gravity");return number(values.get(Math.min(gravityCalls++,values.size()-1)));}
+    }
+    static class BounceBlock extends Block {
+        Data d;BounceBlock(){super(BlockBehaviour.Properties.of());}
+        @Override public float getBounceRestitution(){d.query("block-bounce");return single(d.input.get("block"));}
+        @Override public void bounceOn(Level level,BlockState state,BlockPos p,Entity entity,double distance){d.query(String.format("bounce-on %d %d %d %016x",p.getX(),p.getY(),p.getZ(),Double.doubleToLongBits(distance)));if(d.input.get("mutate").getAsBoolean())d.velocity=new Vec3(17,18,19);}
+    }
+    static class State extends BlockState {
+        Data d;BounceBlock block;State(){super(null,null,null);}
+        @Override public Block getBlock(){return block;}
+        @Override public boolean is(TagKey<Block> tag){if(tag!=BlockTags.SUPPRESSES_BOUNCE)throw new AssertionError(tag);d.query("block-suppresses");return d.input.get("tag").getAsBoolean();}
+    }
+    static class NonLiving extends Marker {
+        NonLiving(){super(null,null);}
+        Data d;
+        @Override public boolean isSuppressingBounce(){return d.suppress();}
+        @Override protected double getEntityBounciness(){d.query("entity-bounce");return number(d.input.get("entity"));}
+        @Override public Vec3 getDeltaMovement(){d.query("velocity");return d.velocity;}
+        @Override protected double getEffectiveGravity(){return d.gravity();}
+        @Override protected float getAirDrag(){d.query("drag");return single(d.input.get("drag"));}
+        @Override public BlockPos getBlockPosBelowThatAffectsMyMovement(){d.query("support-position");return new BlockPos(17,-64,-33);}
+        @Override public void gameEvent(Holder<GameEvent> event){if(event!=GameEvent.BOUNCE)throw new AssertionError(event);d.query("bounce-event");}
+        @Override public void setDeltaMovement(Vec3 velocity){d.query(vectorText("set-velocity",velocity));d.velocity=velocity;}
+    }
+    static class Living extends ArmorStand {
+        Living(){super(null,null);}
+        Data d;
+        @Override public boolean isSuppressingBounce(){return d.suppress();}
+        @Override protected double getEntityBounciness(){d.query("entity-bounce");return number(d.input.get("entity"));}
+        @Override public Vec3 getDeltaMovement(){d.query("velocity");return d.velocity;}
+        @Override protected double getEffectiveGravity(){return d.gravity();}
+        @Override protected float getAirDrag(){d.query("drag");return single(d.input.get("drag"));}
+        @Override public BlockPos getBlockPosBelowThatAffectsMyMovement(){d.query("support-position");return new BlockPos(17,-64,-33);}
+        @Override public void gameEvent(Holder<GameEvent> event){if(event!=GameEvent.BOUNCE)throw new AssertionError(event);d.query("bounce-event");}
+        @Override public void setDeltaMovement(Vec3 velocity){d.query(vectorText("set-velocity",velocity));d.velocity=velocity;}
+    }
+    public static void main(String[] args)throws Exception {
+        net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();
+        var allocator=Class.forName("sun.misc.Unsafe");var access=allocator.getDeclaredField("theUnsafe");access.setAccessible(true);var unsafe=access.get(null);var allocate=allocator.getMethod("allocateInstance",Class.class);
+        var method=Entity.class.getDeclaredMethod("restituteMovementAfterCollisions",BlockState.class,boolean.class,boolean.class,Vec3.class);method.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.input=f;d.out=out;d.velocity=vector(f.get("velocity"));Entity entity;
+                if(f.get("living").getAsBoolean()){var e=(Living)allocate.invoke(unsafe,Living.class);e.d=d;entity=e;}else{var e=(NonLiving)allocate.invoke(unsafe,NonLiving.class);e.d=d;entity=e;}
+                entity.verticalCollision=f.get("vertical").getAsBoolean();entity.verticalCollisionBelow=f.get("below").getAsBoolean();entity.fallDistance=number(f.get("fall"));entity.syncPosition=f.get("sync").getAsBoolean();
+                var block=(BounceBlock)allocate.invoke(unsafe,BounceBlock.class);block.d=d;var state=(State)allocate.invoke(unsafe,State.class);state.d=d;state.block=block;
+                try{method.invoke(entity,state,f.get("x").getAsBoolean(),f.get("z").getAsBoolean(),vector(f.get("resolved")));out.println("result ok");}
+                catch(InvocationTargetException error){if(error.getCause() instanceof Stop)out.println("result error");else throw error;}
+                out.println(vectorText("final",d.velocity));out.println("sync "+entity.syncPosition);out.println("queries "+d.calls);
+            }
+        }
+    }
+}
@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""Compare post-collision restitution, bounce callbacks and partial failure state 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(flags=31,entity=0,block=1,vy=-2,gravity=(0.08,0.08),suppress=(False,False),tag=False,drag=0.98,fail=-1,mutate=False,dx=0.3,dz=-0.2,resolved=-0.1):
+        return dict(x=bool(flags&1),z=bool(flags&2),vertical=bool(flags&4),below=bool(flags&8),living=bool(flags&16),sync=bool(flags&32),
+                    entity=bits(entity),block=single(block),velocity=list(map(bits,[dx,vy,dz])),resolved=list(map(bits,[0,resolved,0])),
+                    gravity=list(map(bits,gravity)),suppress=list(suppress),tag=tag,drag=single(drag),fail=fail,mutate=mutate,fall=bits(3.25))
+    for flags in range(64):
+        for entity in [0,-0.0,0.5,1,-1,float('nan'),float('inf')]:
+            for block in [0,0.1,0.8,1,float('nan')]:
+                for suppress in [(False,False),(True,),(False,True)]:
+                    for tag in [False,True]:yield row(flags,entity,block,vy=[-2,-0.08,0][flags%3],suppress=suppress,tag=tag)
+    for vy in [-float('inf'),-2,-math.nextafter(0.08,1),-0.08,-math.nextafter(0.08,0),-0.0,0,0.08,2,float('nan'),float('inf')]:
+        for gravity in [(0,0),(.08,.08),(.08,.3),(float('nan'),.08)]:
+            for flags in [4,12,15,31]:
+                for entity in [0,.5]:
+                    for resolved in [0,-0.1,vy]:yield row(flags,entity,vy=vy,gravity=gravity,resolved=resolved)
+    for flags in [0,1,3,4,12,15,31,63]:
+        for fail in range(-1,17):
+            for mutate in [False,True]:yield row(flags,entity=.5,fail=fail,mutate=mutate)
+    rng=random.Random(0x5245535449545554)
+    for index in range(5000):
+        values=[-2,-.08,-0.0,0,.08,.5,1,2,float('nan'),float('inf'),-float('inf')]
+        yield row(rng.randrange(64),rng.choice(values),rng.choice(values),rng.choice(values),gravity=(rng.choice(values),rng.choice(values)),
+                  suppress=(bool(rng.randrange(2)),bool(rng.randrange(2))),tag=bool(index%3==0),drag=rng.choice(values),
+                  fail=rng.choice([-1,-1,-1,0,2,5,8,12]),mutate=bool(index%2),dx=rng.choice(values),dz=rng.choice(values),resolved=rng.choice(values))
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-restitution-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/VanillaRestitutionOracle.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/restitution_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.VanillaRestitutionOracle',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','restitution_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'/('restitution_fixture.exe' if os.name=='nt' else 'restitution_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:,} restitution 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 Entity.restituteMovementAfterCollisions over living/nonliving snapshots and controlled block restitution/tag behavior. Compares horizontal/vertical bounce, effective-gravity threshold, nonliving float scaling, air-drag interpolation, signed zero/nonfinite values and ordered lazy queries. Bounce callbacks can change velocity and fail; final velocity and syncPosition are checked after every injected failure boundary. This does not establish registered block restitution/tag provisioning, actual bounce sound/game-event effects, Entity.move guard conditions, fall damage, grounding or full gameplay.'}
+    lab.write_json(report_path,report);print(f'Scoped restitution parity passed: {report_path}')
+
+
+if __name__=='__main__':main()