From 66d5f6b251e68bd6131ee552184b4d9adea92ba7 Mon Sep 17 00:00:00 2001
From: Jared Miller <jared@smell.flowers>
Date: Wed, 11 Mar 2026 14:10:38 -0400
Subject: [PATCH] Add SandPhysicsScene for Margolus block CA

---
 src/scenes/SandPhysicsScene.ts | 43 ++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 src/scenes/SandPhysicsScene.ts

diff --git a/src/scenes/SandPhysicsScene.ts b/src/scenes/SandPhysicsScene.ts
new file mode 100644
index 0000000..6c7a531
--- /dev/null
+++ b/src/scenes/SandPhysicsScene.ts
@@ -0,0 +1,43 @@
+import * as THREE from "three";
+import type Renderer from "../Renderer";
+import fragmentShader from "../shaders/sandPhysics.frag";
+import vertexShader from "../shaders/sandPhysics.vert";
+import FullScreenTriangleGeometry from "../utils/FullScreenTriangleGeometry";
+import AbstractScene from "./AbstractScene";
+
+export default class SandPhysicsScene extends AbstractScene {
+    public readonly camera: THREE.OrthographicCamera =
+        new THREE.OrthographicCamera();
+    public readonly material: THREE.RawShaderMaterial;
+
+    constructor(renderer: Renderer) {
+        super(renderer);
+
+        const geometry = new FullScreenTriangleGeometry();
+        const material = new THREE.RawShaderMaterial({
+            uniforms: {
+                uWorld: { value: null },
+                uMaterialProps: { value: null },
+                uBlockOffset: { value: new THREE.Vector2(0, 0) },
+                uFrame: { value: 0 },
+            },
+            vertexShader,
+            fragmentShader,
+            defines: this.renderer.getCommonMaterialDefines(),
+            glslVersion: THREE.GLSL3,
+        });
+        const mesh = new THREE.Mesh(geometry, material);
+        this.add(mesh);
+
+        this.material = material;
+    }
+
+    public recompileMaterials() {
+        this.material.defines = this.renderer.getCommonMaterialDefines();
+        this.material.needsUpdate = true;
+    }
+
+    public resize(_width: number, _height: number) {}
+
+    public update() {}
+}