Fix apparent jitter in player movement

Remember: `time.delta_secs()` needs to be included in ALL movement calculations!!! This one was pretty well hidden because the player movement was properly interpolated and the camera lerped after it, but it was still barely noticeable!
Update scroll sensitivity for discrete mouse wheels
2025-05-22 23:17:53 -04:00 · 2025-05-22 23:04:03 -04:00 · 2025-05-22 23:03:32 -04:00 · 2025-05-22 23:03:11 -04:00
5 changed files with 280 additions and 11 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -81,6 +81,21 @@ dependencies = [
 "winit",
 ]

+[[package]]
+name = "addr2line"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfbe277e56a376000877090da837660b4427aad530e3028d44e0bffe4f89a1c1"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler2"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
+
 [[package]]
 name = "ahash"
 version = "0.8.12"
@ -201,6 +216,12 @@ dependencies = [
 "windows-sys 0.59.0",
 ]

+[[package]]
+name = "anyhow"
+version = "1.0.98"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
+
 [[package]]
 name = "approx"
 version = "0.5.1"
@ -294,6 +315,25 @@ dependencies = [
 "futures-lite",
 ]

+[[package]]
+name = "async-io"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43a2b323ccce0a1d90b449fd71f2a06ca7faa7c54c2751f06c9bd851fc061059"
+dependencies = [
+ "async-lock",
+ "cfg-if",
+ "concurrent-queue",
+ "futures-io",
+ "futures-lite",
+ "parking",
+ "polling",
+ "rustix",
+ "slab",
+ "tracing",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "async-lock"
 version = "3.4.0"
@ -373,6 +413,21 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "backtrace"
+version = "0.3.75"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6806a6321ec58106fea15becdad98371e28d92ccbc7c8f1b3b6dd724fe8f1002"
+dependencies = [
+ "addr2line",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "base64"
 version = "0.21.7"
@ -743,6 +798,7 @@ dependencies = [
 "bevy_platform",
 "bevy_ptr",
 "bevy_reflect",
+ "bevy_remote",
 "bevy_render",
 "bevy_scene",
 "bevy_sprite",
@ -960,6 +1016,29 @@ dependencies = [
 "uuid",
 ]

+[[package]]
+name = "bevy_remote"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4a4c243aefa8f99ab90baf8c39f9c7100d3f470f616fe2324012c3797d0bcbc"
+dependencies = [
+ "anyhow",
+ "async-channel",
+ "async-io",
+ "bevy_app",
+ "bevy_derive",
+ "bevy_ecs",
+ "bevy_platform",
+ "bevy_reflect",
+ "bevy_tasks",
+ "bevy_utils",
+ "http-body-util",
+ "hyper",
+ "serde",
+ "serde_json",
+ "smol-hyper",
+]
+
 [[package]]
 name = "bevy_render"
 version = "0.16.0"
@ -1984,6 +2063,12 @@ version = "0.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d674e81391d1e1ab681a28d99df07927c6d4aa5b027d7da16ba32d1d21ecd99"

+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@ -2083,6 +2168,24 @@ dependencies = [
 "pin-project-lite",
 ]

+[[package]]
+name = "futures-task"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f90f7dce0722e95104fcb095585910c0977252f286e354b5e3bd38902cd99988"
+
+[[package]]
+name = "futures-util"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "pin-project-lite",
+ "pin-utils",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.16"
@ -2108,6 +2211,12 @@ dependencies = [
 "wasi 0.14.2+wasi-0.2.4",
 ]

+[[package]]
+name = "gimli"
+version = "0.31.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07e28edb80900c19c28f1072f2e8aeca7fa06b23cd4169cefe1af5aa3260783f"
+
 [[package]]
 name = "gl_generator"
 version = "0.14.0"
@ -2296,6 +2405,71 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dfa686283ad6dd069f105e5ab091b04c62850d3e4cf5d67debad1933f55023df"

+[[package]]
+name = "http"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4a85d31aea989eead29a3aaf9e1115a180df8282431156e533de47660892565"
+dependencies = [
+ "bytes",
+ "fnv",
+ "itoa",
+]
+
+[[package]]
+name = "http-body"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1efedce1fb8e6913f23e0c92de8e62cd5b772a67e7b3946df930a62566c93184"
+dependencies = [
+ "bytes",
+ "http",
+]
+
+[[package]]
+name = "http-body-util"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b021d93e26becf5dc7e1b75b1bed1fd93124b374ceb73f43d4d4eafec896a64a"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "http",
+ "http-body",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "httparse"
+version = "1.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6dbf3de79e51f3d586ab4cb9d5c3e2c14aa28ed23d180cf89b4df0454a69cc87"
+
+[[package]]
+name = "httpdate"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
+
+[[package]]
+name = "hyper"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc2b571658e38e0c01b1fdca3bbbe93c00d3d71693ff2770043f8c29bc7d6f80"
+dependencies = [
+ "bytes",
+ "futures-channel",
+ "futures-util",
+ "http",
+ "http-body",
+ "httparse",
+ "httpdate",
+ "itoa",
+ "pin-project-lite",
+ "smallvec",
+ "tokio",
+]
+
 [[package]]
 name = "image"
 version = "0.25.6"
@ -2351,6 +2525,12 @@ dependencies = [
 "either",
 ]

+[[package]]
+name = "itoa"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
+
 [[package]]
 name = "jni"
 version = "0.21.1"
@ -2541,6 +2721,15 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"

+[[package]]
+name = "miniz_oxide"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e3e04debbb59698c15bacbb6d93584a8c0ca9cc3213cb423d31f760d8843ce5"
+dependencies = [
+ "adler2",
+]
+
 [[package]]
 name = "naga"
 version = "24.0.0"
@ -2984,6 +3173,15 @@ dependencies = [
 "objc2-foundation",
 ]

+[[package]]
+name = "object"
+version = "0.36.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62948e14d923ea95ea2c7c86c71013138b66525b86bdc08d2dcc262bdb497b87"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "offset-allocator"
 version = "0.2.0"
@ -3148,6 +3346,12 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"

+[[package]]
+name = "pin-utils"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
 [[package]]
 name = "piper"
 version = "0.2.4"
@ -3548,6 +3752,12 @@ version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c20b6793b5c2fa6553b250154b78d6d0db37e72700ae35fad9387a46f487c97"

+[[package]]
+name = "rustc-demangle"
+version = "0.1.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
+
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
@ -3596,6 +3806,12 @@ dependencies = [
 "unicode-script",
 ]

+[[package]]
+name = "ryu"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
+
 [[package]]
 name = "safe_arch"
 version = "0.7.4"
@ -3671,6 +3887,18 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "serde_json"
+version = "1.0.140"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20068b6e96dc6c9bd23e01df8827e6c7e1f2fddd43c21810382803c136b99373"
+dependencies = [
+ "itoa",
+ "memchr",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@ -3761,6 +3989,19 @@ dependencies = [
 "xkeysym",
 ]

+[[package]]
+name = "smol-hyper"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7428a49d323867702cd12b97b08a6b0104f39ec13b49117911f101271321bc1a"
+dependencies = [
+ "async-executor",
+ "async-io",
+ "futures-io",
+ "hyper",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "smol_str"
 version = "0.2.2"
@ -4000,6 +4241,16 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"

+[[package]]
+name = "tokio"
+version = "1.45.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2513ca694ef9ede0fb23fe71a4ee4107cb102b9dc1930f6d0fd77aae068ae165"
+dependencies = [
+ "backtrace",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "toml_datetime"
 version = "0.6.9"
--- a/Cargo.toml
+++ b/Cargo.toml
@ -22,6 +22,7 @@ avian2d = { version = "0.3.0", features = ["serialize", "simd"] }
 bevy = { version = "0.16.0", default-features = false, features = [
 	"bevy_color",
 	"bevy_core_pipeline",
+	"bevy_remote",
 	"bevy_render",
 	"bevy_ui",
 	"bevy_window",
@ -37,5 +38,8 @@ log = { version = "*", features = [
 	"max_level_debug",
 	"release_max_level_warn",
 ] }
-rand = { version = "0.9.1", default-features = false, features = ["std", "thread_rng"] }
+rand = { version = "0.9.1", default-features = false, features = [
+	"std",
+	"thread_rng",
+] }
 wyrand = "0.3.2"
--- a/src/game/runtime.rs
+++ b/src/game/runtime.rs
@ -1,6 +1,7 @@
 use avian2d::prelude::*;
 use bevy::{
    input::mouse::{AccumulatedMouseScroll, MouseScrollUnit},
+    math::curve::EaseFunction::SmoothStep,
    prelude::*,
 };

@ -14,19 +15,19 @@ pub fn move_player(
 ) -> Result {
    let acceleration = 500.0;

-    let delta_time = time.delta_secs();
+    let delta_v = acceleration * time.delta_secs();

    if keyboard_input.any_pressed([KeyCode::KeyW, KeyCode::ArrowUp]) {
-        velocity.y += acceleration * delta_time;
+        velocity.y += delta_v;
    }
    if keyboard_input.any_pressed([KeyCode::KeyS, KeyCode::ArrowDown]) {
-        velocity.y -= acceleration * delta_time;
+        velocity.y -= delta_v;
    }
    if keyboard_input.any_pressed([KeyCode::KeyA, KeyCode::ArrowLeft]) {
-        velocity.x -= acceleration * delta_time;
+        velocity.x -= delta_v;
    }
    if keyboard_input.any_pressed([KeyCode::KeyD, KeyCode::ArrowRight]) {
-        velocity.x += acceleration * delta_time;
+        velocity.x += delta_v;
    }

    Ok(())
@ -39,10 +40,14 @@ pub fn quit(mut exit: EventWriter<AppExit>) {

 /// Follow the player character with the camera
 pub fn move_camera(
+    time: Res<Time>,
    mut camera: Single<&mut Transform, (Without<Player>, With<IsDefaultUiCamera>)>,
    player: Single<&Transform, (With<Player>, Without<IsDefaultUiCamera>)>,
 ) {
-    camera.translation = camera.translation.lerp(player.translation, 0.05);
+    camera.translation = camera.translation.lerp(
+        player.translation,
+        SmoothStep.sample_clamped(time.delta_secs() * 15.0),
+    );
 }

 /// Adjust the camera zoom based on the scroll wheel input
@ -54,7 +59,7 @@ pub fn zoom_camera(
        return Err("Default camera was not orthographic".into());
    };
    let scroll_type_multiplier = match scroll.unit {
-        MouseScrollUnit::Line => 0.01,
+        MouseScrollUnit::Line => 0.1,
        MouseScrollUnit::Pixel => 0.001,
    };
    projection.scale = (projection.scale - scroll.delta.y * scroll_type_multiplier).clamp(0.1, 2.5);
--- a/src/game/setup.rs
+++ b/src/game/setup.rs
@ -50,6 +50,7 @@ pub fn setup_player(
 ) {
    let circle = Circle::new(radius.0);
    commands.spawn((
+        Name::new("Player"),
        Player,
        Collider::from(circle),
        Mesh2d(meshes.add(circle)),
@ -65,9 +66,10 @@ pub fn setup_balls(
    region: Res<PlayableArea>,
 ) {
    let mut random = thread_rng();
-    for _ in 0..BALL_COUNT {
+    for i in 0..BALL_COUNT {
        let circle = Circle::new(random.random_range(BALL_SIZES));
        commands.spawn((
+            Name::new(format!("Ball[{i}]")),
            Ball,
            Collider::from(circle),
            Mesh2d(meshes.add(circle)),
@ -104,6 +106,7 @@ pub fn setup_walls(
        );

        commands.spawn((
+            Name::new(format!("Wall[{i}]")),
            Wall,
            Collider::rectangle(length, thickness),
            Mesh2d(meshes.add(Rectangle::new(length, thickness))),
--- a/src/main.rs
+++ b/src/main.rs
@ -1,8 +1,14 @@
-use bevy::prelude::{App, AppExit};
+use bevy::{
+    prelude::{App, AppExit},
+    remote::{RemotePlugin, http::RemoteHttpPlugin},
+};
 use clap::Parser;

 use distributed_physics_test::AppSettings;

 fn main() -> AppExit {
-    App::new().add_plugins(AppSettings::parse()).run()
+    App::new()
+        .add_plugins(AppSettings::parse())
+        .add_plugins((RemotePlugin::default(), RemoteHttpPlugin::default()))
+        .run()
 }
Author	SHA1	Message	Date
Michael Bradley	d73683359a	Fix apparent jitter in player movement All checks were successful CI / Formatting (push) Successful in 1m15s Details Remember: `time.delta_secs()` needs to be included in ALL movement calculations!!! This one was pretty well hidden because the player movement was properly interpolated and the camera lerped after it, but it was still barely noticeable!	2025-05-22 23:17:53 -04:00
Michael Bradley	b42563a94d	Update scroll sensitivity for discrete mouse wheels	2025-05-22 23:04:03 -04:00
Michael Bradley	bef0b66ee1	Add names to entities	2025-05-22 23:03:32 -04:00
Michael Bradley	2df3f0262b	Add Bevy remote protocol setup	2025-05-22 23:03:11 -04:00