Shared memory and context tools for agentic work.
Code Rooms
import { useRef, useMemo } from "react";
import { useFrame } from "@react-three/fiber";
import { Line } from "@react-three/drei";
import * as THREE from "three";
const ADD = THREE.AdditiveBlending;
// Comet trail: [position lag from main, opacity fraction, scale fraction]
const TRAIL_CFG = [
[0.000, 1.00, 1.00],
[0.032, 0.55, 0.78],
[0.062, 0.28, 0.56],
[0.092, 0.11, 0.36],
] as const;
interface CometParticleProps {
start: THREE.Vector3;
end: THREE.Vector3;
phase: number;
speed: number;
color: string;
activationTime: number;
cycleLength: number;
baseSize: number;
}
function CometParticle({
start,
end,
phase,
speed,
color,
activationTime,
cycleLength,
baseSize,
}: CometParticleProps) {
// Explicit refs: never put useRef() inside an array
const ref0 = useRef<THREE.Mesh>(null);
const ref1 = useRef<THREE.Mesh>(null);
const ref2 = useRef<THREE.Mesh>(null);
const ref3 = useRef<THREE.Mesh>(null);
useFrame(({ clock }) => {
const t = clock.getElapsedTime();
const cycle = t % cycleLength;
const isActive = cycle >= activationTime;
const ramp = isActive ? Math.min(1, (cycle - activationTime) * 2.5) : 0;
const baseT = ((t * speed + phase) % 1 + 1) % 1;
const refList = [ref0, ref1, ref2, ref3] as const;
TRAIL_CFG.forEach(([lag, opMult, scaleMult], i) => {
const ref = refList[i];
if (!ref.current) return;
const mat = ref.current.material as THREE.MeshBasicMaterial;
if (isActive) {
const flowT = ((baseT - lag) % 1 + 1) % 1;
ref.current.position.lerpVectors(start, end, flowT);
// Sinusoidal size envelope: largest at midpoint of path
const sizeEnv = 0.5 + 0.5 * Math.sin(Math.PI * flowT);
ref.current.scale.setScalar(sizeEnv * (scaleMult as number));
mat.opacity = ramp * (opMult as number);
} else {
mat.opacity = Math.max(0, mat.opacity - 0.07);
ref.current.scale.setScalar(1);
});
return (
<>
<mesh ref={ref0} position={start.toArray() as [number, number, number]}>
<sphereGeometry args={[baseSize, 8, 8]} />
<meshBasicMaterial color={color} transparent opacity={0} blending={ADD} depthWrite={false} />
</mesh>
<mesh ref={ref1} position={start.toArray() as [number, number, number]}>
<sphereGeometry args={[baseSize * 0.88, 7, 7]} />
<mesh ref={ref2} position={start.toArray() as [number, number, number]}>
<sphereGeometry args={[baseSize * 0.72, 6, 6]} />
<mesh ref={ref3} position={start.toArray() as [number, number, number]}>
<sphereGeometry args={[baseSize * 0.56, 5, 5]} />
</>
);
export interface FlowEdgeProps {
start: [number, number, number];
end: [number, number, number];
color?: string;
activationTime?: number;
cycleLength?: number;
speed?: number;
particleCount?: number;
lineWidth?: number;
export function FlowEdge({
color = "#00f5ff",
activationTime = 0,
cycleLength = 9,
speed = 0.35,
particleCount = 3,
lineWidth = 1,
}: FlowEdgeProps) {
const bloomRef = useRef<any>(null);
const coreRef = useRef<any>(null);
const startVec = useMemo(
() => new THREE.Vector3(...start),
[start[0], start[1], start[2]]
const endVec = useMemo(
() => new THREE.Vector3(...end),
[end[0], end[1], end[2]]
const particleSize = useMemo(() => {
const d = startVec.distanceTo(endVec);
return Math.max(0.045, Math.min(0.085, d * 0.015));
}, [startVec, endVec]);
const ramp = isActive ? Math.min(1, (cycle - activationTime) * 2.0) : 0;
const bloomMaterial = bloomRef.current?.material as THREE.Material & { opacity?: number } | undefined;
if (bloomMaterial && typeof bloomMaterial.opacity === "number") {
const tgt = (0.25 + Math.sin(t * 1.1 + start[0]) * 0.04) * ramp;
bloomMaterial.opacity += (tgt - bloomMaterial.opacity) * 0.07;
const coreMaterial = coreRef.current?.material as THREE.Material & { opacity?: number } | undefined;
if (coreMaterial && typeof coreMaterial.opacity === "number") {
const tgt = (0.52 + Math.sin(t * 2.3 + end[0] + 0.7) * 0.07) * ramp;
coreMaterial.opacity += (tgt - coreMaterial.opacity) * 0.09;
{/* Colored bloom halo */}
<Line
ref={bloomRef}
points={[start, end]}
color={color}
lineWidth={lineWidth * 3.5}
transparent
opacity={0.0}
blending={ADD}
depthWrite={false}
/>
{/* White laser core */}
ref={coreRef}
color="#ffffff"
lineWidth={lineWidth * 0.85}
{/* Comet trail particles */}
{Array.from({ length: particleCount }).map((_, i) => (
<CometParticle
key={i}
start={startVec}
end={endVec}
phase={i / particleCount}
speed={speed}
activationTime={activationTime}
cycleLength={cycleLength}
baseSize={particleSize}
))}
