From 06f4e4a24e833f920faa0dfaaefea8f09e706eba Mon Sep 17 00:00:00 2001
From: ghostly_zsh <ghostly@e3t.cc>
Date: Thu, 26 Mar 2026 15:57:46 -0500
Subject: [PATCH] feat: radiation area

---
 crates/unified/assets/config/parts/hearty.part.toml  | 3 ++-
 crates/unified/assets/config/parts/housing.part.toml | 5 +++--
 crates/unified/src/config/part.rs                    | 1 +
 crates/unified/src/server/heat/radiation.rs          | 1 -
 crates/unified/src/server/part.rs                    | 2 +-
 5 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/crates/unified/assets/config/parts/hearty.part.toml b/crates/unified/assets/config/parts/hearty.part.toml
index 8b99f5a49452d5975d5d1dbec8601a8f5b9eb83b..7947d453dcac6848eaaee112f3091b9f6cb6b606 100644
--- a/crates/unified/assets/config/parts/hearty.part.toml
+++ b/crates/unified/assets/config/parts/hearty.part.toml
@@ -3,7 +3,8 @@ name = "Hearty"
 sprite_connected = "textures/hearty.png"
 sprite_disconnected = "textures/hearty.png"
 emissivity = 0.1
-specific_heat = 100.0
+specific_heat = 800.0
+radiation_area = 200.0
 
 [physics]
 width = 50
diff --git a/crates/unified/assets/config/parts/housing.part.toml b/crates/unified/assets/config/parts/housing.part.toml
index 5ea25e5aad3dd808223bab504e3d69a3067176c9..e2876954e32adb1d7dcade505ef8d9255e2f3ee2 100644
--- a/crates/unified/assets/config/parts/housing.part.toml
+++ b/crates/unified/assets/config/parts/housing.part.toml
@@ -2,8 +2,9 @@
 name = "Housing"
 sprite_connected = "textures/thruster_on.png"
 sprite_disconnected = "textures/thruster_off.png"
-emissivity = 0.2
-specific_heat = 100.0
+emissivity = 0.1
+specific_heat = 500.0
+radiation_area = 20.0
 
 [physics]
 width = 50
diff --git a/crates/unified/src/config/part.rs b/crates/unified/src/config/part.rs
index c7344cb7d61ac404f72a31001b8121eda21fb142..d9e7f4e3698d474b30a34968f1d47bf1deba1207 100644
--- a/crates/unified/src/config/part.rs
+++ b/crates/unified/src/config/part.rs
@@ -23,6 +23,7 @@ pub struct PartPartConfig {
     pub sprite_disconnected: String,
     pub emissivity: f32,
     pub specific_heat: f32,
+    pub radiation_area: f32,
 }
 #[derive(Deserialize, TypePath, Serialize, Clone, Debug, PartialEq)]
 pub struct PartPhysicsConfig {
diff --git a/crates/unified/src/server/heat/radiation.rs b/crates/unified/src/server/heat/radiation.rs
index 0fa30700def1877adcaa7d46cfbaeb236f20729d..0ff516cf61b6fa1d5a892960b6c5d463db6fe511 100644
--- a/crates/unified/src/server/heat/radiation.rs
+++ b/crates/unified/src/server/heat/radiation.rs
@@ -26,7 +26,6 @@ fn part_radiation(
         // x_n+1 = x_n - g(x_n)/g'(x_n)
         // where x_n is the previous guess for T_n+1
         let initial_temp = temperature.0;
-        // temporary specific heat (c) of 1000.0
         let k = (radiator.emissivity * STEFAN_BOLTZMANN * radiator.surface_area)
             / (part.strong_config.physics.mass * part.strong_config.part.specific_heat);
         let dt = time.delta_secs();
diff --git a/crates/unified/src/server/part.rs b/crates/unified/src/server/part.rs
index 7ccf9752b87514ce64269ea948391e14cce2cbb4..89f216e08940d771a8c7fed072476b2bc27caac2 100644
--- a/crates/unified/src/server/part.rs
+++ b/crates/unified/src/server/part.rs
@@ -130,7 +130,7 @@ fn calculate_bundle(config: &PartConfig, handle: &Handle<PartConfig>) -> impl Bu
     let temperature = Temperature(298.0); // note that this is 25 degrees C
     let radiator = Radiator {
         emissivity: config.part.emissivity,
-        surface_area: config.physics.width * config.physics.height,
+        surface_area: config.part.radiation_area,
     };
 
     (