diff --git a/src/App.ts b/src/App.ts
index 6ef22f1..0838c7d 100644
--- a/src/App.ts
+++ b/src/App.ts
@@ -5,6 +5,7 @@ import AntsComputeScene from "./scenes/AntsComputeScene";
 import AntsDiscretizeScene from "./scenes/AntsDiscretizeScene";
 import DrawScene from "./scenes/DrawScene";
 import ScreenScene from "./scenes/ScreenScene";
+import SandPhysicsScene from "./scenes/SandPhysicsScene";
 import WorldBlurScene from "./scenes/WorldBlurScene";
 import WorldComputeScene from "./scenes/WorldComputeScene";
 
@@ -15,6 +16,7 @@ export interface SceneCollection {
     discretize: AntsDiscretizeScene;
     screen: ScreenScene;
     draw: DrawScene;
+    sandPhysics: SandPhysicsScene;
 }
 
 export default new (class App {
@@ -57,6 +59,7 @@ export default new (class App {
             discretize: new AntsDiscretizeScene(this.renderer),
             screen: new ScreenScene(this.renderer),
             draw: new DrawScene(this.renderer),
+            sandPhysics: new SandPhysicsScene(this.renderer),
         };
     }
 
diff --git a/src/Renderer.ts b/src/Renderer.ts
index e1e89e1..f835c50 100644
--- a/src/Renderer.ts
+++ b/src/Renderer.ts
@@ -16,11 +16,19 @@ import {
     generateLookupData,
     MaterialRegistry,
 } from "./materials";
+import {
+    BEHAVIOR_GAS,
+    BEHAVIOR_LIQUID,
+    BEHAVIOR_POWDER,
+    BEHAVIOR_SOLID,
+} from "./materials/types";
+import { getBlockOffset } from "./sand/margolus";
 
 interface Resources {
     worldRenderTarget: THREE.WebGLRenderTarget;
     worldRenderTargetCopy: THREE.WebGLRenderTarget;
     worldBlurredRenderTarget: THREE.WebGLRenderTarget;
+    sandPhysicsRenderTarget: THREE.WebGLRenderTarget;
     antsComputeTarget0: THREE.WebGLRenderTarget;
     antsComputeTarget1: THREE.WebGLRenderTarget;
     antsDiscreteRenderTarget: THREE.WebGLRenderTarget;
@@ -30,6 +38,7 @@ interface Resources {
 export default class Renderer {
     private renderer: THREE.WebGLRenderer;
     public resources!: Resources;
+    private frameCounter = 0;
     private colonyStats = new ColonyStats();
     public readonly materialRegistry = new MaterialRegistry();
     public readonly materialPropsTexture!: THREE.DataTexture;
@@ -98,6 +107,17 @@ export default class Renderer {
                     minFilter: THREE.NearestFilter,
                 },
             ),
+            sandPhysicsRenderTarget: new THREE.WebGLRenderTarget(
+                Config.worldSize,
+                Config.worldSize,
+                {
+                    format: THREE.RGBAFormat,
+                    type: THREE.FloatType,
+                    depthBuffer: false,
+                    magFilter: THREE.NearestFilter,
+                    minFilter: THREE.NearestFilter,
+                },
+            ),
             antsComputeTarget0: Renderer.makeAntsMRT(antTextureSize),
             antsComputeTarget1: Renderer.makeAntsMRT(antTextureSize),
             antsDiscreteRenderTarget: new THREE.WebGLRenderTarget(
@@ -146,10 +166,26 @@ export default class Renderer {
         const [antsComputeSource, antsComputeTarget] =
             scenes.ants.getRenderTargets();
 
+        // sand physics pass
+        const blockOffset = getBlockOffset(this.frameCounter);
+        this.setViewportFromRT(this.resources.sandPhysicsRenderTarget);
+        this.renderer.setRenderTarget(this.resources.sandPhysicsRenderTarget);
+        scenes.sandPhysics.material.uniforms.uWorld.value =
+            this.resources.worldRenderTarget.texture;
+        scenes.sandPhysics.material.uniforms.uMaterialProps.value =
+            this.materialPropsTexture;
+        scenes.sandPhysics.material.uniforms.uBlockOffset.value.set(
+            blockOffset.x,
+            blockOffset.y,
+        );
+        scenes.sandPhysics.material.uniforms.uFrame.value = this.frameCounter;
+        this.renderer.render(scenes.sandPhysics, scenes.sandPhysics.camera);
+        this.frameCounter++;
+
         this.setViewportFromRT(this.resources.worldBlurredRenderTarget);
         this.renderer.setRenderTarget(this.resources.worldBlurredRenderTarget);
         scenes.worldBlur.material.uniforms.tWorld.value =
-            this.resources.worldRenderTarget.texture;
+            this.resources.sandPhysicsRenderTarget.texture;
         this.renderer.render(scenes.worldBlur, scenes.worldBlur.camera);
 
         this.renderer.setRenderTarget(this.resources.antsPresenceRenderTarget);
@@ -272,6 +308,12 @@ export default class Renderer {
             MAT_ROCK: String(MAT_ROCK),
             MAT_FOOD: String(MAT_FOOD),
             MAT_HOME: String(MAT_HOME),
+            BEHAVIOR_POWDER:
+                Renderer.convertNumberToFloatString(BEHAVIOR_POWDER),
+            BEHAVIOR_LIQUID:
+                Renderer.convertNumberToFloatString(BEHAVIOR_LIQUID),
+            BEHAVIOR_GAS: Renderer.convertNumberToFloatString(BEHAVIOR_GAS),
+            BEHAVIOR_SOLID: Renderer.convertNumberToFloatString(BEHAVIOR_SOLID),
         };
     }
 
@@ -299,6 +341,15 @@ export default class Renderer {
         this.renderer.setRenderTarget(this.resources.worldBlurredRenderTarget);
         this.renderer.clear();
 
+        this.resources.sandPhysicsRenderTarget.setSize(
+            Config.worldSize,
+            Config.worldSize,
+        );
+        this.renderer.setRenderTarget(this.resources.sandPhysicsRenderTarget);
+        this.renderer.clear();
+
+        this.frameCounter = 0;
+
         this.resources.antsComputeTarget0.setSize(
             antTextureSize,
             antTextureSize,