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fix(pipeline): MP1b review - bake CLI determinism + bounded memory

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Adversarially-verified review findings 1 and 10:

(1) The bake pipeline no longer accumulates every decoded ObjectMeshData
in one ConcurrentBag before writing (multi-GB OOM risk on the full
bake), and no longer writes blobs in thread-completion order (which
violated the plan's "bakes must be byte-reproducible run-to-run").
New shape in BakeRunner: build the FULL id list, sort by PakKey, chunk
into 512-id batches; Parallel.ForEach WITHIN each batch; sort each
batch's results by key and AddBlob sequentially; release the batch.
Batches are contiguous key ranges, so the blob region lands in global
key order regardless of thread scheduling, and peak memory is one
batch's output. Side-staged particle-preload meshes drain per batch
into a key-deduped map (first instance wins — per-id extraction output
is deterministic, so instance choice cannot affect bytes) and are
written after all batches, sorted by key, skipping keys already
written.

Program.cs is now a thin arg-parsing shell over the public BakeRunner
so the new dat-gated byte-reproducibility test can drive the REAL
pipeline: tests/AcDream.Bake.Tests (new project, rule 6; registered in
slnx; no Silk.NET in its resolved dependency graph — verified) bakes
the same 9-id mixed fixture twice with DIFFERENT thread counts (8 vs
3 — thread scheduling was the nondeterminism source) and asserts the
two pak files are byte-identical. Ran for real against the dats on
this machine: green.

(10) The isSetup argument for EnvCell extraction now matches at both
call sites (BakeRunner and PakEquivalenceTests both pass false) and is
documented at each: the runtime's own request sites
(WbMeshAdapter.IncrementRefCount / EnsureLoaded) pass isSetup: false
for every MeshRef id including cell-geometry ids. The parameter is
currently dead in MeshExtractor.PrepareMeshData (dispatch is on the
resolved dat type), but two disagreeing call sites were a latent trap.

Header FormatVersion is no longer set by the bake (PakWriter stamps it
per review finding 2, previous commit).
This commit is contained in:
Erik 2026-07-05 22:14:31 +02:00
parent 84d1956d84
commit 86e0dc4655
6 changed files with 371 additions and 208 deletions
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248
src/AcDream.Bake/BakeRunner.cs Normal file
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@ -0,0 +1,248 @@
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AcDream.Content;
using AcDream.Content.Pak;
using DatReaderWriter;
using DatReaderWriter.DBObjs;
using DatReaderWriter.Options;
namespace AcDream.Bake;
/// <summary>Options for one bake run (parsed from CLI args by Program, or built directly by tests).</summary>
public sealed record BakeOptions {
public required string DatDir { get; init; }
public required string OutPath { get; init; }
public HashSet<uint>? IdFilter { get; init; }
public HashSet<uint>? LandblockFilter { get; init; }
public int Threads { get; init; } = System.Environment.ProcessorCount;
}
/// <summary>
/// The bake pipeline: enumerate ids -> sorted-batch parallel extraction ->
/// deterministic pak write. Public (rather than inline in Program) so the
/// dat-gated byte-reproducibility test can drive the REAL pipeline.
///
/// <para><b>Determinism + bounded memory (review finding 1):</b> the full id
/// list is built first and sorted by pak key; work proceeds in fixed-size
/// batches — extraction is parallel WITHIN a batch, then the batch's results
/// are sorted by key and written sequentially before the next batch starts.
/// Batches are contiguous key ranges, so the blob region ends up in global
/// key order regardless of thread scheduling, and memory is bounded by one
/// batch's decoded output instead of the whole game's. Side-staged
/// particle-preload meshes are deduped into a keyed map as each batch
/// drains (first instance wins — extraction output per id is
/// deterministic, so instance choice cannot affect bytes) and written after
/// all batches, sorted by key, skipping keys already written.</para>
/// </summary>
public static class BakeRunner {
/// <summary>Ids extracted in parallel per batch before the sequential sorted write. Bounds peak memory (~512 decoded ObjectMeshData) while keeping the workers busy.</summary>
private const int BatchSize = 512;
public static int Run(BakeOptions options) {
Console.WriteLine("acdream-bake");
Console.WriteLine($"dat dir: {options.DatDir}");
Console.WriteLine($"out: {options.OutPath}");
Console.WriteLine($"threads: {options.Threads}");
Console.WriteLine();
var sw = Stopwatch.StartNew();
using var dats = new DatCollection(options.DatDir, DatAccessType.Read);
using var datReaderWriter = new BakeDatCollectionAdapter(dats);
var extractorLogger = new ConsoleErrorLogger(nameof(MeshExtractor));
// Thread-safe side-stage sink for particle-preload meshes MeshExtractor
// emits mid-extraction (MP1a documented contract; extractor is shared
// across the batch workers).
var sideStaged = new ConcurrentQueue<ObjectMeshData>();
var extractor = new MeshExtractor(datReaderWriter, extractorLogger, data => sideStaged.Enqueue(data));
// ---- enumeration -----------------------------------------------------
var gfxObjIds = dats.GetAllIdsOfType<GfxObj>().ToList();
var setupIds = dats.GetAllIdsOfType<Setup>().ToList();
var envCellIds = EnumerateEnvCellIds(dats, options.LandblockFilter);
if (options.IdFilter is not null) {
gfxObjIds = gfxObjIds.Where(options.IdFilter.Contains).ToList();
setupIds = setupIds.Where(options.IdFilter.Contains).ToList();
envCellIds = envCellIds.Where(options.IdFilter.Contains).ToList();
}
// Full work list sorted by pak key — the batching below preserves this
// global order on disk (determinism precondition).
var work = new List<(ulong Key, PakAssetType Type, uint FileId)>(gfxObjIds.Count + setupIds.Count + envCellIds.Count);
work.AddRange(gfxObjIds.Select(id => (PakKey.Compose(PakAssetType.GfxObjMesh, id), PakAssetType.GfxObjMesh, id)));
work.AddRange(setupIds.Select(id => (PakKey.Compose(PakAssetType.SetupMesh, id), PakAssetType.SetupMesh, id)));
work.AddRange(envCellIds.Select(id => (PakKey.Compose(PakAssetType.EnvCellMesh, id), PakAssetType.EnvCellMesh, id)));
work.Sort((a, b) => a.Key.CompareTo(b.Key));
Console.WriteLine($"enumerated: {gfxObjIds.Count:N0} GfxObj, {setupIds.Count:N0} Setup, {envCellIds.Count:N0} EnvCell " +
$"({work.Count:N0} total)");
Console.WriteLine();
// ---- sorted-batch extraction + streaming write -------------------------
var header = new PakHeader {
PortalIteration = (uint)dats.Portal.Iteration!.CurrentIteration,
CellIteration = (uint)dats.Cell.Iteration!.CurrentIteration,
HighResIteration = (uint)dats.HighRes.Iteration!.CurrentIteration,
LanguageIteration = (uint)dats.Local.Iteration!.CurrentIteration,
BakeToolVersion = 1,
};
var failures = new ConcurrentBag<(PakAssetType Type, uint FileId, string Reason)>();
var writtenKeys = new HashSet<ulong>();
var sideStagedByKey = new Dictionary<ulong, ObjectMeshData>();
long completed = 0;
int writtenCounts0 = 0, writtenCounts1 = 0, writtenCounts2 = 0; // GfxObj, Setup, EnvCell
var lastProgressReport = Stopwatch.StartNew();
using (var writer = new PakWriter(options.OutPath, header)) {
for (int batchStart = 0; batchStart < work.Count; batchStart += BatchSize) {
var batch = work.Skip(batchStart).Take(BatchSize).ToList();
var batchResults = new ConcurrentBag<(ulong Key, PakAssetType Type, ObjectMeshData Data)>();
Parallel.ForEach(
batch,
new ParallelOptions { MaxDegreeOfParallelism = options.Threads },
item => {
var (key, type, fileId) = item;
try {
// EnvCell entries store the cell's synthetic geometry mesh
// (bit 32 set — see MeshExtractor.PrepareMeshData's EnvCell
// branch); the cell's static objects are covered by their
// own GfxObj/Setup entries.
ulong extractorId = type == PakAssetType.EnvCellMesh ? fileId | 0x1_0000_0000UL : fileId;
// isSetup: matches the runtime's own request sites —
// WbMeshAdapter.IncrementRefCount/EnsureLoaded pass
// isSetup: false for every MeshRef id (incl. cell-geometry
// ids); only true Setup extraction passes true. (Review
// finding 10 — keep aligned with PakEquivalenceTests.)
bool isSetup = type == PakAssetType.SetupMesh;
var data = extractor.PrepareMeshData(extractorId, isSetup);
if (data is not null) {
batchResults.Add((key, type, data));
}
else {
failures.Add((type, fileId, "extractor returned null (no polygons or unresolvable id)"));
}
}
catch (Exception ex) {
// A malformed dat entry skips that id — never fatal to the
// bake, matching the runtime's own per-id behavior.
failures.Add((type, fileId, ex.Message));
}
Interlocked.Increment(ref completed);
});
// Sequential sorted write: batch results in key order.
foreach (var (key, type, data) in batchResults.OrderBy(r => r.Key)) {
writer.AddBlob(key, data);
writtenKeys.Add(key);
switch (type) {
case PakAssetType.GfxObjMesh: writtenCounts0++; break;
case PakAssetType.SetupMesh: writtenCounts1++; break;
case PakAssetType.EnvCellMesh: writtenCounts2++; break;
}
}
// Drain side-staged preloads per batch into the dedup map so the
// queue never grows past one batch's emissions (memory bound);
// written after all batches, sorted (see below).
while (sideStaged.TryDequeue(out var staged)) {
uint fileId = (uint)(staged.ObjectId & 0xFFFFFFFFu);
ulong key = PakKey.Compose(PakAssetType.GfxObjMesh, fileId);
if (!sideStagedByKey.ContainsKey(key)) sideStagedByKey[key] = staged;
}
if (lastProgressReport.Elapsed.TotalSeconds >= 5 || batchStart + BatchSize >= work.Count) {
ReportProgress(completed, work.Count, failures.Count, sw.Elapsed);
lastProgressReport.Restart();
}
}
// Side-staged preload meshes not already covered by a primary entry:
// sorted by key for deterministic placement.
int sideStagedWritten = 0, sideStagedDuped = 0;
foreach (var (key, data) in sideStagedByKey.OrderBy(kv => kv.Key)) {
if (writtenKeys.Contains(key)) { sideStagedDuped++; continue; }
writer.AddBlob(key, data);
writtenKeys.Add(key);
sideStagedWritten++;
}
writer.Finish();
sw.Stop();
var outSize = new FileInfo(options.OutPath).Length;
Console.WriteLine();
Console.WriteLine("=== bake summary ===");
Console.WriteLine($" GfxObj baked: {writtenCounts0:N0}");
Console.WriteLine($" Setup baked: {writtenCounts1:N0}");
Console.WriteLine($" EnvCell baked: {writtenCounts2:N0}");
Console.WriteLine($" side-staged baked (particle preload GfxObjs): {sideStagedWritten:N0} ({sideStagedDuped:N0} deduped)");
Console.WriteLine($" total blobs: {writtenKeys.Count:N0}");
Console.WriteLine($" failures: {failures.Count:N0}");
Console.WriteLine($" elapsed: {sw.Elapsed.TotalSeconds:F1} s");
Console.WriteLine($" output size: {outSize / 1024.0 / 1024.0:F1} MB");
Console.WriteLine($" output path: {options.OutPath}");
}
if (!failures.IsEmpty) {
Console.WriteLine();
Console.WriteLine($"failures ({failures.Count}):");
foreach (var (type, fileId, reason) in failures.OrderBy(f => f.FileId).Take(200)) {
Console.WriteLine($" {type,-12} 0x{fileId:X8}: {reason}");
}
if (failures.Count > 200) Console.WriteLine($" ... and {failures.Count - 200} more");
}
return 0;
}
private static void ReportProgress(long done, int total, int failures, TimeSpan elapsed) {
double rate = elapsed.TotalSeconds > 0 ? done / elapsed.TotalSeconds : 0;
double etaSeconds = rate > 0 ? (total - done) / rate : 0;
Console.WriteLine($"[{elapsed:hh\\:mm\\:ss}] baked {done:N0}/{total:N0}, failures={failures:N0}, " +
$"elapsed={elapsed.TotalSeconds:F0}s, ETA={etaSeconds:F0}s");
}
/// <summary>
/// Enumerates EnvCell ids by walking the cell dat's LandBlockInfo entries
/// (0xFFFE low 16 bits) and, for each, the NumCells-derived cell id range —
/// GetAllIdsOfType&lt;T&gt;() does not cover cell-dat range-based types
/// (DatReaderWriter's documented limitation; see the low-16-bit bucketing
/// idiom in src/AcDream.Cli/Program.cs's CountCellByLow16, and the
/// firstCellId/NumCells hydration idiom in GameWindow.BuildPhysicsDatBundle
/// / BuildInteriorEntitiesForStreaming).
/// </summary>
private static List<uint> EnumerateEnvCellIds(DatCollection dats, HashSet<uint>? landblockFilter) {
var landblockInfoIds = new List<uint>();
foreach (var file in dats.Cell.Tree) {
if ((file.Id & 0xFFFFu) != 0xFFFEu) continue;
uint landblockId = file.Id & 0xFFFF0000u;
if (landblockFilter is not null && !landblockFilter.Contains(landblockId)) continue;
landblockInfoIds.Add(file.Id);
}
var envCellIds = new List<uint>();
foreach (var lbInfoId in landblockInfoIds) {
if (!dats.Cell.TryGet<LandBlockInfo>(lbInfoId, out var lbInfo) || lbInfo is null) continue;
if (lbInfo.NumCells == 0) continue;
uint landblockId = lbInfoId & 0xFFFF0000u;
uint firstCellId = landblockId | 0x0100u;
for (uint offset = 0; offset < lbInfo.NumCells; offset++) {
envCellIds.Add(firstCellId + offset);
}
}
return envCellIds;
}
}

216
src/AcDream.Bake/Program.cs
View file

@ -1,27 +1,15 @@
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AcDream.Bake;
using AcDream.Content;
using AcDream.Content.Pak;
using DatReaderWriter;
using DatReaderWriter.DBObjs;
using DatReaderWriter.Options;
using Environment = System.Environment;
// acdream-bake: offline CLI producing a versioned pak file containing every
// ObjectMeshData the client's decode workers would otherwise produce at
// runtime (GfxObj / Setup / EnvCell mesh+texture payloads).
//
// Drives AcDream.Content.MeshExtractor — the SAME extraction code the live
// client runs — so pak-vs-live equivalence is by construction (verified by
// the Task 6 dat-gated equivalence suite), not by a second hand-written
// extraction path.
// Thin arg-parsing shell over BakeRunner (the real pipeline lives there so
// the dat-gated byte-reproducibility test can drive it directly).
//
// Plan: docs/superpowers/plans/2026-07-05-mp1b-pak-and-bake.md, Task 5.
@ -66,160 +54,13 @@ if (!Directory.Exists(datDir)) {
outPath ??= Path.Combine(datDir, "acdream.pak");
Console.WriteLine("acdream-bake");
Console.WriteLine($"dat dir: {datDir}");
Console.WriteLine($"out: {outPath}");
Console.WriteLine($"threads: {threads}");
Console.WriteLine();
var sw = Stopwatch.StartNew();
using var dats = new DatCollection(datDir, DatAccessType.Read);
using var datReaderWriter = new BakeDatCollectionAdapter(dats);
var extractorLogger = new ConsoleErrorLogger(nameof(MeshExtractor));
// A ConcurrentQueue collector for particle-preload meshes MeshExtractor
// side-stages mid-extraction (CollectEmittersFromScript). MeshExtractor is
// documented thread-safe for up to MaxParallelLoads (4) concurrent workers
// sharing one instance and requires this sink argument explicitly — no
// default — so a bake tool can't silently forget it and drop preloads.
// The bake tool treats each side-staged item as its own GfxObjMesh entry,
// deduplicated by id the same way the enumerated id set is.
var sideStaged = new ConcurrentQueue<ObjectMeshData>();
var extractor = new MeshExtractor(datReaderWriter, extractorLogger, data => sideStaged.Enqueue(data));
// ---- enumeration ---------------------------------------------------------
var gfxObjIds = dats.GetAllIdsOfType<GfxObj>().ToList();
var setupIds = dats.GetAllIdsOfType<Setup>().ToList();
var envCellIds = EnumerateEnvCellIds(dats, landblockFilter);
if (idFilter is not null) {
gfxObjIds = gfxObjIds.Where(idFilter.Contains).ToList();
setupIds = setupIds.Where(idFilter.Contains).ToList();
envCellIds = envCellIds.Where(idFilter.Contains).ToList();
}
var work = new List<(PakAssetType Type, uint FileId)>(gfxObjIds.Count + setupIds.Count + envCellIds.Count);
work.AddRange(gfxObjIds.Select(id => (PakAssetType.GfxObjMesh, id)));
work.AddRange(setupIds.Select(id => (PakAssetType.SetupMesh, id)));
work.AddRange(envCellIds.Select(id => (PakAssetType.EnvCellMesh, id)));
Console.WriteLine($"enumerated: {gfxObjIds.Count:N0} GfxObj, {setupIds.Count:N0} Setup, {envCellIds.Count:N0} EnvCell " +
$"({work.Count:N0} total)");
Console.WriteLine();
// ---- parallel extract -----------------------------------------------------
var results = new ConcurrentBag<(PakAssetType Type, uint FileId, ObjectMeshData Data)>();
var failures = new ConcurrentBag<(PakAssetType Type, uint FileId, string Reason)>();
long completed = 0;
var progressLock = new object();
var lastProgressReport = Stopwatch.StartNew();
Parallel.ForEach(
work,
new ParallelOptions { MaxDegreeOfParallelism = threads },
item => {
var (type, fileId) = item;
try {
ulong extractorId = type == PakAssetType.EnvCellMesh ? fileId | 0x1_0000_0000UL : fileId;
bool isSetup = type == PakAssetType.SetupMesh;
var data = extractor.PrepareMeshData(extractorId, isSetup);
if (data is not null) {
// Extractor echoes back its own resolved ObjectId (which may
// differ in the high bits for EnvCell synthetic-geometry
// requests) — always key the pak entry by the ENUMERATED
// fileId so lookups at read time are predictable.
results.Add((type, fileId, data));
}
else {
failures.Add((type, fileId, "extractor returned null (no polygons or unresolvable id)"));
}
}
catch (Exception ex) {
// A malformed dat entry skips that id — never fatal to the bake,
// matching the runtime's own per-id try/catch behavior.
failures.Add((type, fileId, ex.Message));
}
long done = Interlocked.Increment(ref completed);
lock (progressLock) {
if (lastProgressReport.Elapsed.TotalSeconds >= 5) {
ReportProgress(done, work.Count, failures.Count, sw.Elapsed);
lastProgressReport.Restart();
}
}
});
ReportProgress(completed, work.Count, failures.Count, sw.Elapsed);
Console.WriteLine();
// ---- write pak -----------------------------------------------------------
var header = new PakHeader {
FormatVersion = 1,
PortalIteration = (uint)dats.Portal.Iteration!.CurrentIteration,
CellIteration = (uint)dats.Cell.Iteration!.CurrentIteration,
HighResIteration = (uint)dats.HighRes.Iteration!.CurrentIteration,
LanguageIteration = (uint)dats.Local.Iteration!.CurrentIteration,
BakeToolVersion = 1,
};
var seenSideStagedIds = new HashSet<ulong>();
int written = 0, sideStagedWritten = 0, sideStagedDuped = 0;
using (var writer = new PakWriter(outPath, header)) {
foreach (var (type, fileId, data) in results) {
writer.AddBlob(PakKey.Compose(type, fileId), data);
written++;
}
// Side-staged particle-preload GfxObj meshes: dedup by id against BOTH
// each other and the primary GfxObj set already written (a particle's
// preload GfxObj can also be independently enumerated as a top-level
// GfxObj — MeshExtractor.PrepareMeshData(id, isSetup:false) is
// deterministic, so re-extracting would just waste time, but we must
// never write the SAME pak key twice).
var primaryGfxObjIds = new HashSet<uint>(gfxObjIds);
while (sideStaged.TryDequeue(out var staged)) {
uint fileId = (uint)(staged.ObjectId & 0xFFFFFFFFu);
if (primaryGfxObjIds.Contains(fileId) || !seenSideStagedIds.Add(staged.ObjectId)) {
sideStagedDuped++;
continue;
}
writer.AddBlob(PakKey.Compose(PakAssetType.GfxObjMesh, fileId), staged);
sideStagedWritten++;
}
writer.Finish();
}
sw.Stop();
var outSize = new FileInfo(outPath).Length;
Console.WriteLine("=== bake summary ===");
Console.WriteLine($" GfxObj baked: {results.Count(r => r.Type == PakAssetType.GfxObjMesh):N0}");
Console.WriteLine($" Setup baked: {results.Count(r => r.Type == PakAssetType.SetupMesh):N0}");
Console.WriteLine($" EnvCell baked: {results.Count(r => r.Type == PakAssetType.EnvCellMesh):N0}");
Console.WriteLine($" side-staged baked (particle preload GfxObjs): {sideStagedWritten:N0} ({sideStagedDuped:N0} deduped)");
Console.WriteLine($" total blobs: {written + sideStagedWritten:N0}");
Console.WriteLine($" failures: {failures.Count:N0}");
Console.WriteLine($" elapsed: {sw.Elapsed.TotalSeconds:F1} s");
Console.WriteLine($" output size: {outSize / 1024.0 / 1024.0:F1} MB");
Console.WriteLine($" output path: {outPath}");
if (failures.Count > 0) {
Console.WriteLine();
Console.WriteLine($"failures ({failures.Count}):");
foreach (var (type, fileId, reason) in failures.OrderBy(f => f.FileId).Take(200)) {
Console.WriteLine($" {type,-12} 0x{fileId:X8}: {reason}");
}
if (failures.Count > 200) Console.WriteLine($" ... and {failures.Count - 200} more");
}
return 0;
// ---- helpers ---------------------------------------------------------------
return BakeRunner.Run(new BakeOptions {
DatDir = datDir,
OutPath = outPath,
IdFilter = idFilter,
LandblockFilter = landblockFilter,
Threads = threads,
});
static HashSet<uint> ParseHexList(string? raw) {
var result = new HashSet<uint>();
@ -235,42 +76,3 @@ static HashSet<uint> ParseHexList(string? raw) {
}
return result;
}
static void ReportProgress(long done, int total, int failures, TimeSpan elapsed) {
double rate = elapsed.TotalSeconds > 0 ? done / elapsed.TotalSeconds : 0;
double etaSeconds = rate > 0 ? (total - done) / rate : 0;
Console.WriteLine($"[{elapsed:hh\\:mm\\:ss}] baked {done:N0}/{total:N0}, failures={failures:N0}, " +
$"elapsed={elapsed.TotalSeconds:F0}s, ETA={etaSeconds:F0}s");
}
/// <summary>
/// Enumerates EnvCell ids by walking the cell dat's LandBlockInfo entries
/// (0xFFFE low 16 bits) and, for each, the NumCells-derived cell id range —
/// GetAllIdsOfType&lt;T&gt;() does not cover cell-dat range-based types
/// (DatReaderWriter's documented limitation; see the low-16-bit bucketing
/// idiom in src/AcDream.Cli/Program.cs's CountCellByLow16, and the
/// firstCellId/NumCells hydration idiom in GameWindow.BuildPhysicsDatBundle
/// / BuildInteriorEntitiesForStreaming).
/// </summary>
static List<uint> EnumerateEnvCellIds(DatCollection dats, HashSet<uint>? landblockFilter) {
var landblockInfoIds = new List<uint>();
foreach (var file in dats.Cell.Tree) {
if ((file.Id & 0xFFFFu) != 0xFFFEu) continue;
uint landblockId = file.Id & 0xFFFF0000u;
if (landblockFilter is not null && !landblockFilter.Contains(landblockId)) continue;
landblockInfoIds.Add(file.Id);
}
var envCellIds = new List<uint>();
foreach (var lbInfoId in landblockInfoIds) {
if (!dats.Cell.TryGet<LandBlockInfo>(lbInfoId, out var lbInfo) || lbInfo is null) continue;
if (lbInfo.NumCells == 0) continue;
uint landblockId = lbInfoId & 0xFFFF0000u;
uint firstCellId = landblockId | 0x0100u;
for (uint offset = 0; offset < lbInfo.NumCells; offset++) {
envCellIds.Add(firstCellId + offset);
}
}
return envCellIds;
}