repo: remove bevy dependency from buoy-physics (breaks ui)

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 Notable changes to this project will be documented in this file.
 
-## [unreleased]
+## [0.3.0](https://github.com/philiplinden/buoy/compare/v0.2.0..v0.3.0) - 2025-07-28
 
 ### 🧪 Experimental
 
@@ -18,74 +18,4 @@ Notable changes to this project will be documented in this file.
 
 - Remove big_space options (#39) ([`b03eff2`](https://github.com/philiplinden/buoy/commit/b03eff2fb9175f28a235db4cfe9b6da1b0aeb828))
 
-## [0.2.0](https://github.com/philiplinden/buoy/compare/v0.1.0..v0.2.0) - 2025-06-27
-
-### 🚀 Features
-
-- Mesh tools and a simple scene (#37) ([`d9d7bc2`](https://github.com/philiplinden/buoy/commit/d9d7bc29ad77b49017b29eb6dc673a638bddac7a))
-- Add egui side panel (#35) ([`1c5dff4`](https://github.com/philiplinden/buoy/commit/1c5dff46f16cf93c01641ddbb4625dc69aabc544))
-
-### ♻️ Refactor
-
-- Merge buoy-common with buoy-runtime (#38) ([`9e8fd7e`](https://github.com/philiplinden/buoy/commit/9e8fd7e4f29aae8f5b18840d4225965704e0b581))
-- Run headless by default (#36) ([`012f179`](https://github.com/philiplinden/buoy/commit/012f179b78804c3cd393d2d4d304e9e55befb2f9))
-- Buoy-core -> buoy-physics, add buoy-common, grid space is optional (#34) ([`a8e770e`](https://github.com/philiplinden/buoy/commit/a8e770e58c88a950f74c46a53fc069474c044607))
-- Remove python experiments (#33) ([`089042b`](https://github.com/philiplinden/buoy/commit/089042b574e39ba263ec528affa14a5448073341))
-
-### 🐛 Bug Fixes
-
-- Disable mesh utils for now and focus on headless ([`db8ac1f`](https://github.com/philiplinden/buoy/commit/db8ac1f90a3a683c5d5f7902302ff1f66faa871a))
-
-### ⚙️ Repository
-
-- Refresh the changelog on pushes to main ([`26a2e6a`](https://github.com/philiplinden/buoy/commit/26a2e6a3f26df28b7d622901302cc12f579b98dc))
-- Package the bevy-ui binary for releases ([`064e94c`](https://github.com/philiplinden/buoy/commit/064e94cd37ee1a161564b2b5c04f80533033742d))
-- Include unreleased changes in log ([`c9fa447`](https://github.com/philiplinden/buoy/commit/c9fa4478d781a42c0e25d37669a5157b390f4195))
-
-## [0.1.0] - 2025-03-02
-
-### 📚 Documentation
-
-- Update readme ([`5685be7`](https://github.com/philiplinden/buoy/commit/5685be7df46da343be3b831e7e5c15e024227a1c))
-- More resources ([`696266b`](https://github.com/philiplinden/buoy/commit/696266b175e90f3e36d5de8494ef2f7977d41b43))
-
-### ♻️ Refactor
-
-- Disallow dead code in most places, add placeholders for payload ([`edb98d3`](https://github.com/philiplinden/buoy/commit/edb98d3a6aff3c3633de027930e3406e3fdd3bb0))
-
-### 🎨 UI & Styling
-
-- Improved plots ([`6d1bba1`](https://github.com/philiplinden/buoy/commit/6d1bba1862d9be682693fe6932148195a8db3ea7))
-- Switch to egui, add plots (#15) ([`bdc6113`](https://github.com/philiplinden/buoy/commit/bdc6113a3d77993f56df5796358879371002e8f9))
-- Deconflict debug text and console screen space ([`837a626`](https://github.com/philiplinden/buoy/commit/837a626c0a4781d22150d1fe3ea12e71519d5729))
-- Add gizmos, flatten app module (#3) ([`119dade`](https://github.com/philiplinden/buoy/commit/119dade9ffb889d48ddcccb3381958bff7eae594))
-- Add a gas monitor ([`3de7b41`](https://github.com/philiplinden/buoy/commit/3de7b4167d26622d516bd4cf9a11c5c584d724b0))
-- Some debug ui practice ([`c80aa64`](https://github.com/philiplinden/buoy/commit/c80aa64d2bbd4cc2c1932889863bada2f8a1d0c2))
-- Sim state monitoring, play/pause ([`88ce33b`](https://github.com/philiplinden/buoy/commit/88ce33b46f65d1e592057e51128b995d65eb34eb))
-- Drop egui, add iyes_perf_ui ([`8cf8096`](https://github.com/philiplinden/buoy/commit/8cf8096625dd3ea4cfe98125a4f8d1d148eb5fbb))
-
-### 🐛 Bug Fixes
-
-- Fix up physics states ([`b311fe4`](https://github.com/philiplinden/buoy/commit/b311fe4d9e38f67e2c4fa5ee20b268da6797afe1))
-
-### 🧪 Experimental
-
-- Scaffold things in python for prototyping (#25) ([`45f8e98`](https://github.com/philiplinden/buoy/commit/45f8e98b571bff0a2bf8aac607f6745b0cc2743c))
-- Smooth out artifacts ([`11ee325`](https://github.com/philiplinden/buoy/commit/11ee325c5d2f418f33b6db4e483ed94fb9f58709))
-- Experimenting with plots and big space ([`8a57fb7`](https://github.com/philiplinden/buoy/commit/8a57fb7f7f6ce7151209f9f8f577bf3d248b7277))
-- Experimenting with meshes and modules ([`2d75f55`](https://github.com/philiplinden/buoy/commit/2d75f5528cecac68c87851a3f5e1a4388741c1e1))
-- Forces are stable! (#14) ([`5e0dbef`](https://github.com/philiplinden/buoy/commit/5e0dbefea4e4adf7eda26d73c3f7f9eb711020ad))
-
-### ⚙️ Repository
-
-- Yet another reorg - more submodules ([`2ac04de`](https://github.com/philiplinden/buoy/commit/2ac04de27df4b41f1223042e15e2c5a817b1bcb3))
-- Skip deploys ([`2db5450`](https://github.com/philiplinden/buoy/commit/2db5450b77d736bbd545dab3b71a3681782d62f9))
-- I guess docs need sound? ([`eb141a6`](https://github.com/philiplinden/buoy/commit/eb141a6a446042670815ea3cfb9a5598b7f5e036))
-- Replace cache step with the one from leafwing ([`99642d9`](https://github.com/philiplinden/buoy/commit/99642d9cd84ff8eda7d29904e2fc7c22c3fd8f08))
-- Add bevy deps ([`56ed0f3`](https://github.com/philiplinden/buoy/commit/56ed0f3d6c41e6f2b114d4cacfda22bd3e0f2a0a))
-
-
-## New Contributors ❤️
-
-* @philiplinden made their first contribution
 <!-- generated by git-cliff -->

Cargo.toml

@@ -2,7 +2,7 @@
 resolver = "2" # Important for Bevy
 members = [
     "crates/buoy-physics",
-    "crates/buoy-ui",
+    # "crates/buoy-ui",
     "crates/buoy-runtime",
 ]
 
@@ -36,7 +36,6 @@ avian3d = { version = "0.3.1", default-features = false, features = [
     # "collider-from-mesh",
 ] }
 uom = "0.37.0"
-bevy_common_assets = { version = "0.13", features = ["ron"] }
 serde = { version = "1.0", features = ["derive"] }
 
 [workspace.metadata.bevy_cli]

crates/buoy-physics/Cargo.toml

@@ -1,26 +1,16 @@
 [package]
 name = "buoy-physics"
-version = "0.3.0"
-description = "Physics for buoyancy simulation"
+version = "0.4.0"
+description = "Physics for buoyancy simulation (no bevy dependency)"
 edition = { workspace = true }
 authors = { workspace = true }
 license = { workspace = true }
 
 [dependencies]
-bevy = { workspace = true }
-avian3d = { workspace = true }
 uom = { workspace = true }
 serde = { workspace = true }
+glam = "0.30.5"
+log = "0.4.27"
 
 [features]
-default = [
-    "dev",
-]
-dev = [
-    "bevy/dynamic_linking",
-    "bevy/bevy_debug_stepping",
-    "avian3d/bevy_diagnostic",
-]
-
-
-# [package.metadata.mutually_exclusive_features]
+default = []

crates/buoy-physics/src/atmosphere.rs

@@ -5,25 +5,20 @@
 //! - https://www.translatorscafe.com/unit-converter/en-US/calculator/altitude
 //! - https://www.grc.nasa.gov/WWW/K-12/airplane/atmosmet.html
 
-use avian3d::prelude::{Position, RigidBody};
-use bevy::prelude::*;
 use uom::si::{
     f32::*,
     thermodynamic_temperature::{degree_celsius, kelvin},
     pressure::kilopascal,
 };
+use glam::Vec3;
+use log::error;
 
 use crate::{
     ideal_gas::{ideal_gas_density, GasSpecies},
     constants::{STANDARD_TEMPERATURE, STANDARD_PRESSURE},
 };
 
-pub(crate) fn plugin(app: &mut App) {
-    app.insert_resource(Atmosphere);
-}
-
 /// US Standard Atmosphere, 1976
-#[derive(Resource)]
 pub struct Atmosphere;
 
 impl Atmosphere {

crates/buoy-physics/src/force.rs

@@ -0,0 +1,50 @@
+use glam::Vec3;
+use uom::si::{
+    acceleration::meter_per_second_squared, area::square_meter, f32::*, length::meter,
+    mass::kilogram, mass_density::kilogram_per_cubic_meter, ratio::ratio, volume::cubic_meter,
+    velocity::meter_per_second,
+};
+
+use crate::constants::{EARTH_RADIUS_M, STANDARD_GRAVITY};
+
+/// Force (N) due to drag as a solid body moves through a fluid.
+pub fn drag(
+    velocity: Vec3,
+    ambient_density: MassDensity,
+    drag_area: Area,
+    drag_coefficient: f32,
+) -> Vec3 {
+    let velocity_magnitude: f32 = velocity.length();
+    if velocity_magnitude < f32::EPSILON {
+        return Vec3::ZERO;
+    }
+
+    -0.5 * drag_coefficient
+        * ambient_density.get::<kilogram_per_cubic_meter>()
+        * drag_area.get::<square_meter>()
+        * velocity_magnitude * velocity_magnitude
+        * velocity / velocity_magnitude
+}
+
+/// Upward force (N) vector due to atmosphere displaced by the given gas volume.
+/// The direction of this force is always world-space up (it opposes gravity).
+pub fn buoyancy(
+    gravity_acceleration: Acceleration,
+    displaced_volume: Volume,
+    ambient_density: MassDensity,
+) -> Vec3 {
+    Vec3::Y
+        * (displaced_volume.get::<cubic_meter>()
+            * ambient_density.get::<kilogram_per_cubic_meter>()
+            * gravity_acceleration.get::<meter_per_second_squared>())
+}
+
+/// Fraction of standard gravity at an altitude (m) above mean sea level.
+pub fn local_gravity(altitude: Length) -> Acceleration {
+    *EARTH_RADIUS_M / (*EARTH_RADIUS_M + altitude) * *STANDARD_GRAVITY
+}
+
+#[allow(dead_code)]
+pub fn weight(mass: uom::si::f32::Mass, gravity: Acceleration) -> Vec3 {
+    Vec3::NEG_Y * mass.get::<kilogram>() * gravity.get::<meter_per_second_squared>()
+}