From 39f62a1e5a59bb4a469d4b8bf6d00ac6f089b60e Mon Sep 17 00:00:00 2001
From: pennylicker6 <yourshirtisonbackwards@gmail.com>
Date: Mon, 4 Aug 2025 13:38:34 -0800
Subject: [PATCH] Create fission_physics.js

this is not my mod tho. it is senseiollies. he asked me to upload the file to GitHub cause safari hates GitHub.
---
 mods/fission_physics.js | 96 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 mods/fission_physics.js

diff --git a/mods/fission_physics.js b/mods/fission_physics.js
new file mode 100644
index 00000000..4347561c
--- /dev/null
+++ b/mods/fission_physics.js
@@ -0,0 +1,96 @@
+// Basic Fission Mod for Sandboxels
+// Simulates simplified nuclear fission with uranium-235, neutrons, and boron control rods.
+ 
+// Uranium-235: emits 2-3 neutrons when hit by a neutron, heats up, no byproducts.
+elements.uranium235 = {
+    color: "#4a7023", // dark green (uranium oxide green)
+    behavior: behaviors.SOLID,
+    category: "Energy",
+    state: "solid",
+    density: 19050,
+    conduct: 0.05,
+    reactions: {
+        "neutron": {
+            chance: 1,
+            func: function(pixel, otherPixel) {
+                // Remove incoming neutron
+                deletePixel(otherPixel.x, otherPixel.y);
+ 
+                // Increase heat
+                pixel.temp += 200 + Math.random() * 100;
+ 
+                // Emit 2-3 new neutrons nearby
+                let count = Math.floor(Math.random() * 2) + 2;
+                for(let i = 0; i < count; i++) {
+                    let x = pixel.x + Math.floor(Math.random() * 3) - 1;
+                    let y = pixel.y + Math.floor(Math.random() * 3) - 1;
+                    if(!isEmpty(x, y)) continue;
+                    createPixel("neutron", x, y);
+                }
+            }
+        }
+    }
+};
+ 
+// Neutron particle: moves around and disappears after 500 ticks.
+elements.neutron = {
+    color: "#dcdcdc", // light gray / off-white
+    behavior: [
+        "M2|M1|M2",
+        "M1|DL|M1",
+        "M2|M1|M2"
+    ],
+    category: "Energy",
+    state: "gas",
+    density: 0.001,
+    temp: 20,
+    tick: function(pixel) {
+        pixel._neutronLife = (pixel._neutronLife || 0) + 1;
+        if(pixel._neutronLife > 500) {
+            deletePixel(pixel.x, pixel.y);
+        }
+    }
+};
+ 
+// Boron: solid that absorbs neutrons and heats up slightly.
+elements.boron = {
+    color: "#f5f0a1", // pale yellow
+    behavior: behaviors.SOLID,
+    category: "Solids",
+    state: "solid",
+    density: 2460,
+    reactions: {
+        "neutron": {
+            chance: 1,
+            func: function(pixel, otherPixel) {
+                deletePixel(otherPixel.x, otherPixel.y);
+                pixel.temp += 5;
+            }
+        }
+    }
+};
+ 
+// Slow neutrons and some particles passing through water by 20%.
+const slowThroughWater = ["neutron", "proton", "photon"];
+for(let elem of slowThroughWater) {
+    if(elements[elem]) {
+        elements[elem].customTick = function(pixel) {
+            let waterNearby = false;
+            let dirs = [[0,1],[0,-1],[1,0],[-1,0]];
+            for(let dir of dirs) {
+                let x = pixel.x + dir[0];
+                let y = pixel.y + dir[1];
+                let other = pixelMap[x]?.[y];
+                if(other && other.element === "water") {
+                    waterNearby = true;
+                    break;
+                }
+            }
+            if(waterNearby && Math.random() < 0.2) {
+                // Skip tick to slow particle
+                return;
+            }
+        }
+    }
+} 
+