fix calibration

Author: Sheraff

src/pages/particle-life-gpu/index.tsx

@@ -79,19 +79,20 @@ async function start(
 	const width = ctx.canvas.width
 	const height = ctx.canvas.height
 
-	const repulsionRange = 20
-	const attractionRange = 20
-	const repulsionStrength = 20
-	const attractionStrength = 10
+	const repulsionRange = 25
+	const attractionRange = 26
+	const repulsionStrength = 30
+	const attractionStrength = 30
 
 	const cellSize = repulsionRange + attractionRange
 	const widthDivisions = Math.ceil(width / cellSize)
 	const heightDivisions = Math.ceil(height / cellSize)
 	const toBinX = widthDivisions / width
 	const toBinY = heightDivisions / height
 	const binCount = widthDivisions * heightDivisions
-	// const particleCount = 180_000
+	// const particleCount = 130_000
 	const particleCount = 100_000
+	// const particleCount = 20_000
 
 	const particlePositionBuffer = device.createBuffer({
 		label: 'particle position storage buffer',
@@ -148,6 +149,7 @@ async function start(
 		for (let i = 0; i < 6; i++) {
 			for (let j = 0; j < 6; j++) {
 				staticStorageArray[i * 6 + j] = Math.random() * 2 - 1
+				// staticStorageArray[i * 6 + j] = i === j ? 1 : 0
 			}
 		}
 		particleInteractionsBuffer.unmap()

src/pages/particle-life-gpu/update.wgsl

@@ -46,10 +46,10 @@ fn update(
 
 	let range = config.repulsionRange + config.attractionRange;
 
-	let min_bin_x = u32(floor((position.x - range) * config.binWidth));
-	let min_bin_y = u32(floor((position.y - range) * config.binHeight));
-	let max_bin_x = u32(floor((position.x + range) * config.binWidth));
-	let max_bin_y = u32(floor((position.y + range) * config.binHeight));
+	let min_bin_x = u32((position.x - range) * config.binWidth);
+	let min_bin_y = u32((position.y - range) * config.binHeight);
+	let max_bin_x = u32((position.x + range) * config.binWidth);
+	let max_bin_y = u32((position.y + range) * config.binHeight);
 
 	let wd = config.widthDivisions;
 	let hd = config.heightDivisions;
@@ -89,25 +89,18 @@ fn update(
 				}
 
 				let dist = length(offset);
-				if (dist > range) {
-					continue;
-				}
 
-				if (dist < 0.5) {
-					// Collision (elastic bounce) (also avoids division by zero)
-					let other_velocity = particleVelocities[other_index];
-					velocity -= dot(velocity - other_velocity, offset / dist) * (offset / dist);
-				} else if (dist < config.repulsionRange) {
+				if (dist < config.repulsionRange) {
 					// Repulsion
 					let strength = (config.repulsionRange - dist) / config.repulsionRange * config.repulsionStrength * dt;
 					velocity -= normalize(offset) * strength;
-				} else {
+				} else if (dist < range) {
 					// Attraction
 					let other_color = particleColors[other_index];
 					let interaction_index = color * COLOR_COUNT + other_color;
 					let interaction_strength = interactions[interaction_index];
 					let normalized_distance = (config.attractionRange - (dist - config.repulsionRange)) / config.attractionRange;
-					let symmetric_distance = abs(normalized_distance * 2.0 - 1.0);
+					let symmetric_distance = 1.0 - abs(normalized_distance * 2.0 - 1.0);
 					let strength = symmetric_distance * interaction_strength * config.attractionStrength * dt;
 					velocity += normalize(offset) * strength;
 				}
@@ -116,7 +109,7 @@ fn update(
 	}
 
 	// dampen velocity
-	velocity -= normalize(velocity) * 12 * dt;
+	velocity -= velocity * 8 * dt;
 
 	// update position
 	position += velocity * dt;

src/router.ts

@@ -236,7 +236,7 @@ export const ROUTES = {
 			image: particle_life_gpu_image
 		},
 		git: {
-			lastModified: 1762611209000,
+			lastModified: 1762613219000,
 			firstAdded: 1762551884000
 		},
 	},