// Code samples: 4 stories with tabs and problem/approach/constraint structure
function Kw({ children }) { return {children}; }
function Ty({ children }) { return {children}; }
function Fn({ children }) { return {children}; }
function Nm({ children }) { return {children}; }
function CineCode() {
const isMobile = useIsMobile();
const px = isMobile ? '24px' : '56px';
const samples = [
{
id: 'session',
tab: 'NetworkedSession.cs',
title: <>20 users, 7 countries.,
stack: ['Photon', 'C#', 'Reliable Ordered', 'Delta sync'],
problem: 'Engineers in Chile, Canada, USA, Peru, Colombia, Mexico and Australia needed to collaborate on the same 3D bench in real time. Naïve full-state broadcasts crushed bandwidth and lagged on transcontinental links.',
cause: 'Sending the whole world state on every tick is fine on LAN, fatal across the Atlantic. Out-of-order packets also kept overwriting newer state with older state.',
fix: 'Tick-stamped delta sync over reliable-ordered channels. Each peer applies updates only if the tick is newer than its last seen tick, so late packets drop instead of corrupting the scene. State diffs reduced typical session traffic by ~85% across 20 concurrent users.',
code: [
['c', '// broadcast only what changed this tick'],
[null, <>public asyncTaskBroadcastDelta() {'{'}],
[null, <> var delta = _world.DiffSinceTick(_lastSentTick);],
[null, <> if (delta.IsEmpty) return;],
[null, <> delta.Tick = ++_lastSentTick;],
[null, <> await _hub.Send(delta, Channel.ReliableOrdered);],
[null, '}'],
[null, ''],
['c', '// drop stale packets, apply newer ones'],
[null, <>public voidOnPeerDelta(PeerDelta delta) {'{'}],
[null, <> if (delta.Tick <= _lastSeenTick[delta.PeerId])],
[null, <> return;],
[null, <> _world.Apply(delta);],
[null, <> _lastSeenTick[delta.PeerId] = delta.Tick;],
[null, '}'],
],
},
{
id: 'pipeline',
tab: 'AssetImporter.cs',
title: <>CAD into Unity, live.,
stack: ['Unity', 'C#', 'OBJ · FBX · DXF · CAD', 'Streams'],
problem: 'Geologists arrived with CSV survey rows, point clouds, DXF mine layouts, OBJ meshes from external tools and FBX from artists. Everything needed to live inside one Unity scene, round-trippable, without restarting the app.',
cause: 'Each format has its own quirks (axis flips, units, winding order). Per-format ad-hoc importers turned into a maintenance hole.',
fix: 'Single dispatch entry point that routes by extension, with shared post-processing (units → meters, Y-up, smooth normals) and an export inverse. Streams are read off the main thread so the UI never freezes on a 200MB mesh.',
code: [
[null, <>public asyncTask<ImportedAsset> Import(string path) {'{'}],
[null, <> string ext = Path.GetExtension(path).ToLower();],
[null, <> ImportedAsset raw = ext switch {'{'}],
[null, <> ".obj" => awaitParseObj(path),],
[null, <> ".fbx" => awaitParseFbx(path),],
[null, <> ".dxf" => awaitParseDxf(path),],
[null, <> ".csv" => awaitParseCsv(path),],
[null, <> _ => throw newNotSupportedException(ext),],
[null, ' };'],
[null, ''],
['c', ' // normalize: meters, Y-up, recompute normals'],
[null, <> returnNormalize(raw);],
[null, '}'],
],
},
{
id: 'cluster',
tab: 'DiscontinuityClusterer.cs',
title: <>Grouping rock by family.,
stack: ['C#', 'Pattern recognition', 'Vector math', 'Stereonet'],
problem: 'A mine bench can show hundreds of fractures with subtly different orientations. Geologists needed them grouped into structural families to reason about wedge failures and rockfall risk.',
cause: 'Manual binning by dip/dip-direction is slow and human-biased. Angle-only comparisons also break across the ±180° pole flip.',
fix: 'Cluster on the unit normal using absolute dot product so antiparallel normals collapse into the same family. New surfaces either join the closest family within tolerance or seed a new one. Families come out sorted by member count, ready for stereonet rendering.',
code: [
['c', '// cluster discontinuities by orientation'],
[null, <>foreach (var d in discontinuities) {'{'}],
[null, <> Family best = null;],
[null, <> float bestScore = tolerance;],
[null, ''],
[null, <> foreach (var f in _families) {'{'}],
['c', ' // |dot| handles antiparallel normals'],
[null, <> float s = Mathf.Abs(Vector3.Dot(f.Normal, d.Normal));],
[null, <> if (s > bestScore) {'{'} best = f; bestScore = s; {'}'}],
[null, ' }'],
[null, ''],
[null, <> (best ?? SeedNewFamily(d.Normal)).Add(d);],
[null, '}'],
[null, ''],
[null, <>return _families.OrderByDescending(f => f.Count);],
],
},
{
id: 'save',
tab: 'AtomicSave.cs',
title: <>No more corrupted saves.,
stack: ['async/await', 'SemaphoreSlim', 'Atomic I/O', 'C#'],
problem: 'Sessions hold heavy state — meshes, survey rows, sensor streams. File.WriteAllText on the main thread caused 40–80ms hitches and, worse, a crash mid-write left users with a half-written save.',
cause: 'Synchronous I/O on the UI thread plus non-atomic file writes. Rapid saves also raced and landed out of order.',
fix: 'Writes move to a background task, guarded by a SemaphoreSlim so only one save runs at a time. A CancellationTokenSource lets a newer save cancel the one in flight — last write wins. Atomic .tmp → rename guarantees the on-disk file is either the old version or the new one, never half of either.',
code: [
[null, <>public asyncTaskSaveAsync<T>(string slot, T data) {'{'}],
['c', ' // last write wins — cancel any prior'],
[null, <> _cts?.Cancel();],
[null, <> _cts = newCancellationTokenSource();],
[null, ''],
[null, <> await _lock.WaitAsync(_cts.Token);],
[null, ' try {'],
[null, <> string json = JsonUtility.ToJson(data);],
[null, <> awaitWriteAtomicAsync(SlotPath(slot), json, _cts.Token);],
[null, ' }'],
[null, <> finally {'{'} _lock.Release(); {'}'}],
[null, '}'],
],
},
];
const [active, setActive] = React.useState(0);
const s = samples[active];
return (
Code I actually wrote, & why.}
meta={<>04 SYSTEMS PRODUCTION C# UNITY}
/>
{/* tabs — horizontally scrollable on mobile */}